GENERAL ENGINEERING KNOWLEDGE (GENERAL) 1. What type of tubes used in Air comp cooler? A. Spring B. floating C. U type D. fixed type 2. The water from discharge side of the centrifugal pump is supplied as sealing water to the stuffing box for the pump shaft at: A. Sealing ring B. Shaft sleeve C. Lantern ring D. Neck bush 3. Which of the following would be the correct way(s) of using a torque wrench? A. Application of jerk pulls while tightening B. Using an extension C. Tightening beyond the characteristic clicking sound D. None of the above 4. Chromium is a nobler metal when compared to that of steel. In some marine applications Chromium is electroplated to the steel surfaces. Why? A. Chromium is a more noble metal so it will not get corroded and thus steel surfaces will remain protected B. Chromium plating provides corrosion protection as well as high glossiness and high hardness for better wear resistance and reduced friction to the steel surfaces C. Chromium plating is required for providing high glossiness and high hardness for better wear resistance and reduced friction to the steel surfaces and not for corrosion protection D. Chromium reacts with steel to form an alloy during electroplating which is corrosion resistant 5. Correct method of greasing a centrifugal pump bearing is: A. To pump the grease until you feel high back pressure on the Grease pump B. To pump the greasefor 3-4 pumping strokes of Grease pump for each bearing C. To pump the grease when the pump is stopped and drain any old grease at the same time by opening the drain plug, giving only 3-4 pumping strokes on Grease pump for each bearing. the drain plug should then be replaced D. To pump the grease when the pump is running and drain any old grease at the same time by opening the drain plug, until all the old grease is removed and new grease starts coming out of the drain, repeating same for each bearing. the drain plug should then be replaced 6. Centrifugal pumps cannot handle air and require priming. But you are aware that centrifugal which on the same principal can handle air very well. Which two properties of air are responsible because of which the centrifugal pumps cannot handle air:A. Fluidity only B. Density only C. Both fluidity and density D. Compressibility 7. Pump driven clutch type attached vacuum pumps are commonly used for priming ballast pumps and emergency fire pumps. What is the factor which clutches the vacuum pump clutch to the pump clutch during start of the pump? A. Low suction pressure acting against the spring loaded clutching piston B. High suction pressure acting against the spring loaded clutching piston C. Low discharge pressure acting against the spring loaded clutching piston D. High discharge pressure acting against the spring loaded clutching piston 8. It is given that engine room bilge pump has suction manifold on which 3 valves are located. One valve for the 3 engine room bilge wells suction, another one for Bilge tank suction and the third one is for sea water suction. It is found that the Bilge pump is unable to take suction from any of the bilge wells, but is able to take suction efficiently from Bilge tank. What is the most probable cause? A. Pump suction filter cover gasket leaking B. Suction filter cover gasket of one of the Bilge wells is leaking C. Bilge well suction pipeline leaking between individual bilge well valves and suction manifold valve D. Bilge pump suction pipeline leaking between the manifold and the pump 9. Increasing the rotational speed of a cargo pump the pump flow rate will: A. Increase in direct proportion to the increase in speed B. Decrease in direct proportion to the increase in speed C. Flow rate doesn’t???t depend upon speed D. Flow 10. It has been reported that Engine room bilge pump was unable to take suction from Fwd. (P) bilge well while it taking suction efficiently from Fwd.(S) & aft bilge wells. What could be the most probable cause? A. There is leakage in the bilge suction pipeline somewhere between the bilge wells and bilge pump B. The Fwd. (P) bilge well suction valve might be leaking C. The Fwd. (P) bilge well suction filter cover gasket might be leaking D. The pump needs to be overhauled 11. Which of the following is a correct point for sampling of system lube oil for on board or shore analysis? A. Standpipes B. Purifier outlets C. Inlet or outlet of L. O. coolers D. Tank drains 12. Which type of valve is not rotating type.... a) gate v/v b)butterfly v/v c)ball v/v d)plug v/v 13. Emergency steering testing 1. Weekly 2. Monthly 3. At least 3 months 4. Before arrival n departure 14. Rudder is locked at an angle & can be moved by manual change-------1. Follow up 2. Non follow up 14. Rudder is locked at an angle & can be moved by manual change-------1. Follow up 2. Non follow up 16. When securing a centrifugal distillate pump, which of the listed steps should be carried out FIRST? 1. 2. 3. 4. Stop the pump. Close the pressure gage valves. Trip the three-way solenoid valve. Close the sealing line valves to the pump. 17. Which of the following valves cannot prevent backflow of liquid in a pipeline? you need not worry and you can open the valves when required C. Pump driven clutch type attached vacuum pumps are commonly used for priming ballast pumps and emergency fire pump.Gasket thickness very thin c. Uneven tightening of casing bolts b. After cleaning the sea chest filter you have placed the filter in the body and tightened the cover. The discharge of reciprocating pump is pulsating and discharge rate is lesser D. The main disadvantages of a reciprocating pump over a Gear pump is that: A. High discharge pressure acting against the spring loaded declutching piston 20. Discharge of a gear pump is not affected by the direction of rotation while that of reciprocating pump is reversed C. a and c 19.More wear ring clearance d. You can open the filter inlet and outlet valves & directly start using the filter B. Sea Water inlet valve should be crack opened. Low suction pressure acting against the spring loaded declutching piston B. If you do not want to use the sea chest in question. After your overhaul a centrifugal pump is not rotating what may be the possible cause: a.Only a e. Swing Check Valve D. Angle check valve 18. Gate valve B. Which one of the following is the best alternative? A.A. What is the factor which de-clutches the vacuum pump from the pump clutch? A. High suction pressure acting against the spring loaded declutching piston C. the filter body should be purged. Low discharge pressure acting against the spring loaded declutching piston D. Reciprocating pumps are only available in high capacities and for smaller capacities only gear pumps can be used 22. any leakages and thereafter filter can be kept isolated or used as required . a and b f. A gear pump is self priming while a reciprocating pump is not B. Globe Check Valve C. All of the above . You find that the discharge rate of pump is very slow and suction filter is getting clogged frequently. Pump Start but Motor get overloaded or Trip on overload. Fabricate a bigger mesh size suction filter and use in place of normal filter so that frequency of filter blockage is reduced and you can get a better discharge rate 26. What is the best alternative to counteract the problem? A. where a piston pump will give you more pressure and higher flow rate. Cavitations exists E. Remove the pump suction filter and pump out the tank B. Spalling B. Shrinkage cracking D. You are pumping out sludge to a shore facility using your sludge pump. you stop the pump and clean the filter D. Gland packing too tight C.FALSE C. keep an eye on the pump suction pressure and clean the filter as soon as it drops C. Worn out / Damaged ball bearing D.D. Second one is wrong D. softening of the refractory bricks takes place due to presence of sodium/vanadium in fuel? A. As soon as the as the shore facility tells you that they are not receiving any sludge. Alignment is wrong B.TRUE B. Cracking C. Slagging 24. Increase the tank temperature. I don’t know 25. In which of the following types of refractory failure. First Sentence is right. You will close the other side sea chest valves first and then open this side sea chest filter inlet and outlet valves 23. A. Is the statement correct? A. centrifugal pump will typically give you a low flow rate at a lower pressure. Laminar B) Intermittent. Bus bar voltage low 3. Normally ball gets damaged and has to be replaced 28. Normally both the non-metallic seats get worn out and have to be replaced d. Dampen out the pressure pulses and smoothen the flow C. Use of proper refractory material B. All of the above 32. Refer cooling tubes act as self-cooling & expansion by a) Straight tube b) U tube c) Spring tube . reason? 1. What type of repairs can be carried out? a. Purifier is not rotating with desired rpm. No such device is required to be fitted to modern bilge pumps 31. Frequency low 2. A ball valve is found leaking in service and needs to be overhauled.27. continuous C) Continuous. Increase the discharge pressure by storing liquid under pressure D. Proper maintenance of fuel burning equipment C. Supply liquid even when the pump is not running B. The function of an accumulator on the discharge side of a reciprocating bilge pump is to: A. pulsating D) Pulsating. Proper maintenance of boiler water condition D. Friction pads worn out 30. The most important control measure to prevent boiler tube failure is: A. continuous 29. The ball can be machined while the seat can be replaced c. The difference between the discharges of a centrifugal pump n reciprocating pump the discharge of centrifugal pump is ----------while that if reciprocating is --------A) Turbulent. The ball and seat can be lapped together b. The seat fitted is slightly smaller than the outer dimensions of the ball.O. thus providing interference fit when closed B. Seat is not exactly spherical.33. transfer pump was working efficiently.O. A ball valve was found leaking in service. but it stopped taking suction suddenly. Copper tubing is used in refrigerant system because A) It has less internal resistance B) It is cheaper compared to other materials. normal sequence of operation for engine room machineries should not b disturbed.0 m in the F. but Pump is not transferring any F. What is the cause? A) 5th engineer made a mistake by 1st transferring the fwd (s) bilge well. There is a sounding of 6. F. C) It is easier to check leaks in copper based system D)None of the above 36. The pump suction pipeline is blocked 34. U R responsible for daily transfers of engine room bilges. Pump is damaged and needs overhaul B.O. Pump relief valve might be leaking D. deep tank. What is the most probable cause? A. U follow the sequences aft –fwd (P)-fwd(s) bilge well n u have never experienced a problem but 5/E started the transfer n first transferred forward (s) bilge well n without any problem n u join him later u find that bilge pump is not taking suction fr f(p) n aft bilge well n then u have checked everything is normal. Ball is not exactly spherical and is shaped such that during closure the surface coming into contact with seat is of slightly bigger diameter providing sealing D. How do think a ball valve provides perfect sealing? A. B) Fwd (s) Bilge well suction valve is leaking . The valve stopped leaking in closed condition. Upon inspection it was found that the PTFE seat had worn out and was renewed. Either a floating seat is pressed onto trunnion supported ball by liquid pressure or floating ball is pressed onto the seat C. Suction filter cover gasket might leaking C. but slightly tapered so that during closure the ball sits tightly on the seat 35. The suction pressure gauge was renewed recently and is showing a positive pressure when pump is running. Reduce nox .. The gland packing of centrifugal pump should have A) Not allow any breakage under the suction pressure. Cheap b. C) Should allow considerable leakage 38. Boost air pressure c. As the amount of moisture in the air increases. Fire b. Gate valve 2. Butterfly valve 39.C) Bilge pump suction filter cover gasket is leaking. Which of the following valve is liable to open or close under pressure of fluid. if not locked in position? 1. Turbocharger most preferred a. If dew point increases what happens to wet bulb temp and dry bulb temp? Will be same 40. Plug valve 4. ESD III refractory a. Membrane webs 2. D) Fwd (s) Bilge well suction filter cover gasket is leaking. The dew point is reached when the wet bulb temperature is Equal to the dry bulb temperature 41. Insulation c. the difference between the dry bulb and wet bulb temperatures will…………. Fresh water expansion tank 3. 37. Globe valve 3. Change in volume in closed cooling system is achieved by a. Increase efficiency d. B) Should only allow drop by drop continuous leakage under positive suction pressure. Decrease Section 2: 1. Cooling d. Cobalt c. Function of a de-superheater is to. Nickel b. Corrosive b. Back flushing filter . Principle of fire fighting onboard is a. A. Control superheater steam outlet temperature C. Amount of feed set b. Polymer b. Filming amine 10. Temp of sea water inlet 11. Amount of salt water c. None 7.4. Watering of fire b. Which of the following used in boiler treatment is an oxygen scavenging a. Starving of fire c. Tungsten 8. Neutralizing amine c. Increase the efficiency of the boiler D. To cool the furnace internal b. Caustic fire d. To remove the gases c. Reduce steam temperature for auxiliary uses after steam superheater 6. Salinity of distilled water produced depends upon _ a. All the above 5. Protect superheater from overheat B. Microbial degradation a. Dezincification of brass can be prevented by introduction of additives like a. To cool tubes d. Smothering of fire 9. arsenic d. Stable emission c. Why should combustion blowers left running for while after firing a boiler? a. Sodium sulphate d. High pressure differential of a M/E LO filter only can be reduced by a. To absorb latent heat of evaporation d. Fixed vane type emergency fire pump priming vacuum pump. Snake pump b. To transmit latent heat of fussion 18. Can’t maintain at the set point and decrease slowly 13. Progressive cavity pump d. The vacuum pump is engaging. After one week fire pump not taking suction. Cavitations b. To absorb latent heat of fussion c. Change M/E 12. Selective phase corrosion 17. Stress corrosion b. Screw pump c. Detonation c. but not developing vacuum in the suction side. There is no problem 19. Suction filter cover gasket leaks c. Centrifugal pump change over for pumping liquid of high specific gravity the discharge at the rated capacity will be . Changing over to standby filter c. Hot corrosion c. a. Bimetallic corrosion d. Sealing water tank is empty 14. Decompression b.b. The LO temperature (question not complete) a. Sudden closing and opening of valve in sea water pipeline leads to a. Carry over and deposit of all particles in pipe line and reservoir 16. Start decreases immediately c. Excessive lubricator in compressor leads to a. Vacuum pump not overhauled properly d. What will be the cause? a. To transmit latent heat of evaporation b. Will be maintained at the set point d. Corrosion occurs in cooling fresh water system of marine diesel engine a. Suction filter of the pump clogged b. Steam hammering d. Start increases immediately b. Single screw pump used as sludge pump the correct technical name. Purpose of evaporator in domestic refrigeration system a. Gear pump 15. Water hammering c. Sticking in valves and d. Stop using the pump and keep fill in gravity d.a. Zinc plating is used on top of chrome plating for corrosion protection d. Centrifugal pump change over for pumping liquid of high specific gravity what will change? a. b. Ballast pump suction filters during ballast in port purpose of getting blocked frequently you should a. Pump speed 21. Remove the suction filter b. Cooler efficiency has increased b.5 22. Sea water outlet temp nothing to do with efficiency d.41 and o. CE between o.45 d. Discharge head c. CE between O.36 AND 0. The flow of sea water reduced 23. Less than 2% c. Less than 1 % b. Cooler efficiency has decreased c. Stop the ballast operation 24. Increase Decrease Same Convert 50% 20. Straight line tube b. Greater than 2% d.35 b.46 and o. Weldability steel depends on carbon equivalent a. Thickness of chrome plating to increase 25. Discharge pressure b. self compensating for expansion (if multi choice include coil tube also) a. When steel components electroplated with chromium are used in corrosive environment a. U tube c. Sea water outlet temperature of LO cooler decreased while main engine load and sea water inlet temperature not changed this indicates a. CE between o. Tube in air compressors . c. Any % of carbon 26. Coil tube d. Chrome plating prevents corrosion b.4 c. CE<= 0. Protection to the steel will be preferentially corroded c. d. Steel is an alloy of iron carbon and alloying components what is the carbon content? a. Clean frequently as required and also open and check the sea chest filter c. Floating tube kismet kaun sa hota h? . Power consumption d. Crude oil or crude oil+ballast water of same specific gravity ________ current in pump with same discharge pressure a. Increase efficiently c. Insufficient refrigerant d. Heleshaw pump c. The actuator of ballast valve in duct keel in port to carry deballast open best practice a. ___________ boiler feed pumps is used in modern ships a. Reciprocating pump b. More b. silver d. Does not depend 31. Zinc b. 65 c. Manually operated c. Portable pump through manhole. 115 a hoga ya b 33. 90 d. To reduce sulphur corrosion of main engine components a. Lead . 29. Multistage centrifugal pump d. Minium chance of suction fire b. Less c. Platinized titanium 34. Effective soot blowing of exhaust (question changed) a. Too heavy cooling load b. Air in the system c. Which anode ICCP a. Minimum heavy corrosion and leading tube failure d. Single stage centrifugal pump 28. Silicon c. Run at normal load b. Same d. 50 degree Celsius b. Any of the above 32. All the above . Atomizing pressure of fuel c. Interchange from another valve. d. Fuel feed rate in purifier and purifier in series 30. Leave the tank full and ask for shore assistance. Protection of zinc protective coating is good at a. b. Rotor in exhaust valve d. Refrigerant compressor will run continuously a.27. All the above 37. Keep fire extinguisher c. production affected d. High chloride of boiler water is caused by a. Fuel p/p b. In RT flex engine which of the following comment of main engine made redundant a. increase in shell temp b. Stop cooling water circulation to avoid leakages d. Poor quality of boiler make up water d. all 40. Switch alarm b. Purifier leaking bowl opened. Frequent suit blowing b. Auxiliary blower 39. cleaned n seal ring changed and put back but still leaking what might b wrong? . Providing protection of anodes from being painted over during hull painting D. Increase engine speed to blow suite c. Exhaust gas boiler fire suitable measures a. Presence of an insulating material between anode and the cathode 42. Good electrical continuity between anodes and ship???s hull C. Starting air distributor d. Leaking tube of exhaust steam condenser b. Starting air v/v c. All the above 36.35. Excessive steam leak resulting high c. None of the above 38. Hot work onboard a. Refer cooling tubes act as self-cooling & expansion by a) Straight tube b) U tube c) Spring tube 41. Standby person d. Good Insulation between anodes and ship???s hull B. Which of the following is an important requirement for proper functioning of sacrificial anode system? A. heat transfer impaired c. Scale Formation in FWG evaporator side – a. In refrigeration circuit. Room temperature 2. Open relief valve of affected cylinder . Problem in viscotherm C. Round arm tiller design C.A. viscotherm running fine B. the data logger will record what? (Multi choice) 1. Increased fuel injection temperature and maintaining recommended viscosity of a new bunkers fuel oil. best quality bunkers D. Forked tiller design B. Engaging the turning gear and turning the engine until working temperatures are reduced A. Conventional tiller design D. Shut cylinder oil to the affected cylinder C. Shut all cylinder liner ports of affected cylinder D. None 44. high density C. Liquid line temperature 4. A. Blank starting air to the affected cylinder B. high temp B. Overall length of pairs of rams is reduced in which of the following tiller designs of a steering gear arrangement? A. disc size not proper D. Recharge temperature 3. rpm low 43. None of the above 45. Solenoid valve operation 46. Fully refrigerated D. Just check that there is no visible colour/oil traces in sea water so don't have to inform anyone. c. Semi pressurized B. You as a fourth engineer have taken over watch from third engineer. Which vessel is mostly used for carrying NH3/ LPG A. Don't touch the appratus & inform CEO. with suction closed B. shut the OWS & inform CEO. check any oil contaminate C. Purpose of observation tank A. helps the weld formation by shaping the metal transfer C. The coating on an electrode used for electric arc welding A. suddenly the oil content has exceeded 15ppm. b. impact test B. All of the above 52. Fully pressurized C. to check water level B. All the above . With ref to centrifugal p/p characteristics curves what will be the effect when p/p is started A. What will you do? a. to check alkalinity 51. He said OWS is running in 0 ppm. But after taking over watch you observed that fresh water flushing valve is crack open. with discharge shut 49. creates a gas shield to prevent oxidation of the weld material B. d. Non destructive test is A. 48.47. Ultraviolet test 50. After closing it. shut the OWS but no need to inform anyone. provides an electrical insulation for the user D. Pump. coli count C. all 59. forward tank oil level increase B. DCP C. Electrical fire extinguished by A.53. suspended solid B. pump out through EMERGENCY Bilge pump C. In Stern tube. Forward tank oil level decrease . None 54. governor has to be check b. fuel oil system 56. the discharge quantity will not change with following pumps A. Sewage plant efficiency is gauged by A. when coupled to constant speed motor . all 57. Gear pump D. to start heavy machinery D. To avoid overload C. BOD D. Purpose of preferential trip to prevent A. heleshaw B. A. all 58. Flooding in E/R. blackout B. pump out through OWS to overboard B. Co2 B. Drop in header tank level C. steering gear swash plate type C. pump out through General Service pump D. aft of FOREWARD SEAL is leaking then A. FOAM 55. over speed trip of generator— a. Evaporator pressure testing in (multiple choice) A. Vacuum testing in shell 62. Decrease in direct proportion to the increase in speed C. entry/exit time of personnel D. leak test in distillate pump D.D. high heat transfer B. refreshment C. Flow 66. PLATE type heat exchanger is preferred for following advantage A. Leak test in vacuum pump and fittings C. all 65. feed water level . increased time between clean D. Flow rate doesn???t depend upon speed D. all 63. testing in shell B. Increasing the rotational speed of a cargo pump the pump flow rate will: A. 3 D. at least one if deck seal is provided otherwise two 61. controlling swell and shrink of boiler with A. Increase in direct proportion to the increase in speed B. Boiler water level control. Increase in header tank level 60. IG System number of no return valve A. Pr. For carry out major work in tank – A. First aid in entrance B.2 C. 1 B. easy to clean C. B. the same as the pressure in the lubricating system less than the pressure in the lubricating system greater than the pressure in the lubricating system highest at the oil groove location 2. The usual number of single-acting pistons used in a variable stroke axial-piston pump used for steering gears is _____________. that are connected with the main engine. The ambient heat in an engine room which is identified by only a change in temperature is known as sensible heat latent heat total heat residual heat 5. Piping cross-sections over 30 cm in diameter are sized by the __________. 3 or 5 5 or 7 . are coupled to the tail shaft flange? Thrust shaft Stern-tube shaft Intermediate shaft Crank shaft 3. Which of the main shaft segments listed below. inside diameter wall thickness outside diameter threaded diameter 4. none of the above Section 3: 1. The pressure produced within the oil wedge of a rotating journal is ____. water drum D. steam drum C. radially from the shaft parallel to each other and to the shaft parallel to each other but at a right angle to the shaft at an angle to each other and to the shaft 8. The conical steel or composition cone installed on a propeller. It is desirable for an auxiliary boiler safety valve to pop open and reseat quickly to give warning that excessive boiler pressure has been reached prevent wire drawing of the disc and seat . Heavy soot accumulations in an auxiliary boiler could be caused by _____ water in the fuel oil excessive cycling high fuel oil pressure improper burner maintenance 7. when air attains the maximum amount of moisture it can hold at a specific temperature. helical gear pumps are well suited for pumping oil because stuffing boxes eliminate the leakage problems usually associated with other gear pumps it is not necessary to closely maintain design clearances this pump they are essentially self-priming and produce a high suction lift these pumps are designed with extreme tooth angles 10. it is said to be _____________. 7 or 9 9 or 11 6. An axial piston pump differs from a radial piston pump. Positive displacement. superheated saturated condensed convected 9. provides which of the following benefits? Reduce turbulence Help with lubrication Protect against electrolytic corrosion All of the above 11. known as a fairwater cone. In reference to air conditioning. as the pistons of an axial piston pump are positioned _________. and acids always neutralized by oil additives harmless and have no effect on system components 15. prevent valve pounding provide sufficient blow down multi b & d 10. Which of the following statements represents the proper relative direction of flow through a globe valve? . Short cycling of a refrigeration compressor refers to _____________. Which of the following describes the purpose of a striker or doubler plate? Provides a surface for the application of force. Frequently cutting out on over load. Absorbs machinery vibration. as a result of water contamination of hydraulic oil. or the installation of machinery. varnishes. The purpose of the programmed purge cycle on an automatically fired auxiliary boiler is to cool the furnace to prevent pre-ignition remove explosive vapors from the furnace evaporate accumulated unburned fuel oil provide sufficient air in the furnace to allow ignition of the fuel 12. Provides landing surface for the sounding bob of a tank sounding tape. to inject cleaning additives when the bilges are extremely dirty when the main condenser becomes fouled. frequently starting and stopping running too fast running too slow 13. in order to provide additional cooling water circulation to connect the rose box to the independent bilge suction if the bilges become flooded and they cannot be emptied by any other means 14. are generally ____________. removed by cellulose type filters gums. The emergency bilge suction valve is typically used _____________. Prevents valve stem over travel. 16. The by-products of oxidation. . Its cooling power equals that of melting approximately 1000kgs of ice per day. A one ton air conditioning system has which of the listed operating characteristics? It forces approximately 1000kgs of refrigerant through the evaporator per day. The cylinders and intercoolers of most low pressure air compressors are cooled by _uscg2022 water oil air CO2 20. Direction of flow through the valve depends upon the type of seat design used in the valve. Burnt off in a controlled manner through a chimney smoke stack from within the funnel. It forces approximately 1000kgs of air per hour across the evaporator coils. beam brackets are triangular plates joining the deck beam to a bulkhead frame stanchion deck longitudinal 19. and returned to the cargo tanks. Burned in the boilers. condensed. How the cargo boils off is normally handled?uscg15 Compressed. Carbon. In Vessel construction. Direction of flow through the valve is unimportant. 18. Direction of flow should be from above the seat. A portion of the cargo of an LNG carrier boils off during each voyage. Vented to the atmosphere. It contains approximately 1000kgs of refrigerant. Bronze. 17. Which of the materials listed is used as the dynamic seal material on mechanical seals installed on most centrifugal pumps used in water service? Copper. Direction of flow should be from below the seat. 21. Copper and carbon. Mixed with nitrogen and recirculated through the primary barrier. weight of steel plate tensile strength of bolts piping wall thickness tube bursting strength 27. When using a handheld hacksaw. you should apply pressure only on the forward stroke ____________. An important consideration in selecting a lubricating oil for use in a refrigeration compressor is for the oil to ____________.22. only when cutting thin wall tubing only when cutting carbon steel only when cutting conduit at all times 23. have a high viscosity index mix readily with refrigerant have a high freezing point have a low pour point 24. The designation "schedule 80 extra strong " refers to ____________. Latent heat can be defined as the heat which must be added to a substance in order to change it from a solid to liquid liquid to vapor solid to vapor all of the above 26. Tapping threads into a blind hole should be finished by using a ______ short tap taper tap . If the intercooler relief valve lifts while an air compressor is operating under load. you should check for ____ a defective pressure switch or pilot valve a leak in the intercooler piping leakage through the low pressure unloader control diaphragm leaking high pressure discharge valves 25. The factors that determine the service life of packing in a pump will include which of the following conditions? type of pump condition of the shaft length of time in use all of the above 30. One characteristic of a lubricating oil adversely affecting the results of centrifuging is ____________. The ability of a metal to be hammered. ductibility elasticity malleability fusibility 32. Which of the devices listed prevents water from entering a ship's hull via the propulsion shaft? Stern tube packing or mechanical shaft seal . Distilled water from an evaporator may be discharged into a potable water tank uscg268 through a detachable hose connection after passing through an activated charcoal filter after chemical analysis shows it is fit for consumption through a solenoid operated three-way valve 29. plug tap bottoming tap 28. face shield a respirator rubber gloves an all purpose gas mask 31. or rolled out is called its ___________. Personnel working with refrigeration systems and subject to the exposure of refrigerants should wear _______________. high TBN value low oil floc point low oil demulsibility low oil neutralization number 33. is known as the latent heat of _____________. capability of causing brittle fractures highly corrosive action on mild steel vapor cloud which reacts violently with saltwater toxicity at atmospheric pressure 35. Which of the following problems occurring in a hydraulic system can be caused by the use of an oil having a viscosity lower than specified? Seal deterioration Fast response and hunting Increased power consumption Oil film breakdown 37. The only means of removing the latent heat of condensation from a refrigerant in the normal refrigeration cycle is by ________. the most significant characteristic of a cryogenic liquid is its ______________. The heat required to change a substance from a solid to a liquid while at its freezing temperature. Deflector ring and drain Spring bearings Oiler rings 34. With reference to a vessel's structural integrity. fusion vaporization condensation sublimation 36. Which of the following statements represents the main difference between a stuffing box gland and a mechanical seal for sealing the shaft of a centrifugal pump? Packed stuffing box glands are subject to wear.uscg224 passing it through the expansion valve condensing refrigerant in the system condenser passing the gaseous refrigerant through the heat interchanger on the suction side of the compressor maintaining a high pressure on the system's receiver 38. . but mechanical seals are not. clogged lube oil strainers seawater leaking into the lube oil system decreasing lube oil pressure gradually increasing lube oil temperature 41. The charging of a refrigerating system should be carried out by adding _____________. In a shell-and-tube type hydraulic fluid cooler. The sealing surface of a mechanical seal is parallel to the shaft. low temperature use high temperature use . high pressure. such as flax or hemp. the temperature of the hydraulic fluid the flow rate of both the cooling water and the hydraulic fluid the temperature of the cooling water all of the above 40. If packing fails. A leaking suction valve in the second stage of a two stage. the amount of heat transferred from the hydraulic fluid to the cooling water depends upon ________________. but if a mechanical seal fails it must be totally renewed to stop the leakage. Fabric type packing. but mechanical seals do not require cooling. but the sealing surface of a packed gland is perpendicular to the shaft. Packed stuffing box glands must be cooled by the liquid being pumped. refrigerant vapor to the receiver only liquid refrigerant to the low side only liquid refrigerant to the high side only liquid refrigerant to the high or low side 42. 39. air compressor can cause excessively high ________________. The presence of scale and dirt on the saltwater side of lube oil cooler is usually indicated by ___________. is best suited for _____________. the pump can be kept running temporarily by tightening the gland. second stage discharge pressure first stage discharge pressure pressure in the after cooler compressor final discharge temperature 43. and dead smooth refer to the ________. Which of the listed problems is occurring if a coil type high pressure evaporator constantly requires an increase in the coil steam pressure in order to maintain capacity? The brine density is improper. 45. The principal purpose of sub cooling liquid refrigerant prior to its entering the expansion valve is to _ increase the refrigerating effect by decreasing the amount of flash gas allow the refrigerant to enter the throttling device in a saturated condition increase the refrigerating effect by increasing the amount of flash gas minimize the temperature drop of the liquid as it passes through the solenoid valve to the outlet side . Impure distillate is being produced. Heat transfer surfaces are being layered with scale. Shell vapor pressure is constantly decreasing. second cut. The terms rough. coarse. A pump is defined as "a device that _____________. use where alignment is critical packing valves with badly grooved stems 44." produces pressure imparts energy to a fluid to move it from level "A" to level "B" creates a vacuum to move a liquid in all installations is to develop a pressure differential 47. Restrictions occurring in the small orifices of pneumatic control system components can be caused by moisture in the compressed air supply excessive dryness in the compressed air supply pressure surging in the compressed air receiver insufficient lubrication of the system components 48. shape of the file coarseness of the file teeth size of the file cuts of the file 46. smooth. bastard. 49. If a bilge pump is able to develop vacuum, but is unable to sufficiently pump out the bilges, you would check for ________. the circuit breaker for leaks in the suction piping relief valve is not properly seated the suction strainer 50. A first stage unloader installed in a low pressure air compressor is unable to completely retract. This will result in ____ overheating of the discharge valve loss of moisture in the air charge in the receiver frequent lifting of the intercooler relief valve an abnormally low intercooler pressure 51. The heat removed from the refrigerant in the condenser of a refrigeration plant is the latent heat of expansion sensible heat of condensation heat of compression all of the above 52. Excessive leakage and premature failure of valve packing is a result of ____________. opening a valve too quickly jamming a valve in the closed position low pressure fluid flow through the pipeline a scored valve stem 53. The amount of fuel oil atomized by a return flow oil burner is directly controlled by the header supply valve burner root valve oil micrometer valve fuel oil back pressure 54. Fuses are rated in _ voltage amperage interrupting capacity 2 all the above When there is excessive ingress of water in the engine room onboard causing dangerous levels of bilge water, A. Start oily water separator and pump overboard B. Start General service pumps and pump bilges overboard C. Use bilge injection valve and pump bilges overboard D. None of the above 3 If a radial piston hydraulic pump fails to deliver rated fluid volume, the cause can be _______________. contaminated fluid pitted thrust rings worn pintle bearings obstructed suctions passage 4 A fluctuating and unsteady vacuum in an evaporator may be caused by _____________.uscg99 1. wet steam entering the air ejector nozzle 2. pinhole leaks in the evaporator tube nests 3. rapid scaling on the evaporator tube nests 4. high water levels in the last effect 5 A generator has been exposed to water and is being checked for its safe operation. Therefore, it is necessary to _______________.uscg272 check for shorted coils with a explosimeter. take moisture readings with a hydrometer test insulation values with a megger ground the commutator, or slip rings and run it at half load 6 If the pointer fails to return to zero when a megger is disconnected, the_____________.332 pointer is stuck hair springs are burned out megger is out of calibration megger is operating normally 7 When replacing ball bearings on an electric motor shaft, you should _____________.318 a b c d tap the outer race with a mallet apply even pressure to the outer race apply even force to the inner race apply pressure evenly to both the inner and outer races 62. The zipper of an immersion suit should be lubricated with _____________. a b c d paraffin oil graphite vegetable oil 63. An insulation resistance test is performed on a particular piece of electric equipment. In addition to the resistance reading, what information listed below should be entered in the electrical log? The maximum allowable operating temperature of the machine. The temperature of the machine at the time the resistance reading was taken. The normal temperature rise of the machine. The complete name plate data from the resistance test instrument used to obtain the reading. 64. When removing the cap from a sounding tube on a MODU, the sound of air escaping indicates. a. the tank is full b. the tank may be partially flooded c. the tank level has dropped d. the tank is completely flooded 65. A solid stream of water might be useful in fighting a burning oil fire on deck when it is used ____________. a. to wash burning oil over the side b. to provide cooling for the fire fighters c. in conjunction with chemical foam d. to cool the main deck 66. The burner assembly on an automatically fired auxiliary boiler fitted with variable capacity, pressure atomizing burners, maintains steam pressure by a cycling on and off b changing fuel oil return pressure c changing the speed of a rotary cup d Varying air pressure supplied to the nozzle 67. Galvanic action which of the following is false. A. only one metal does not initiate corrosion B. Two metal with electrolyte will not initiate corrosion 68. In Stern tube, aft of FOREWARD SEAL is leaking then A. forward tank oil level increase B. drop in header tank level 69. While starting a hydraulic anchor windlass, you observe that hydraulic pressure does not develop in spite of the proper operation of the electric drive motor. Which of the following actions should you take FIRST to restore pressure? Make certain that the hydraulic reservoir is filled to the proper level. Inspect the disc brake on the electric motor for proper operation. Check the electric motor for an open overload relay contact. Check for full voltage supply to the electric motor. 70. A primary element used with flow measurement devices highly suitable for liquids containing solids in suspension, is a ____________. a. concentric orifice b. convergent nozzle c. venturi tube d. pilot tube 72. Prior to major overhaul of main engine onboard, the engine room crane is tested by A. Operating the crane through the normal range B. Testing of the crane with two sample ???abnormal??? conditions C. Inspection of the crane hook and other safety arrangements D. Stress testing of crane wire with peak loads 73. Water carryover from boiler onboard through the steam causes A. Erosion of the steam plant machinery B. Low water level inside the boiler C. Build-up of deposits on the steam plant machinery To prevent blow out of the flame D. Short cycling of a fridge compressor can occur in which of the following cases? A. Duty of standby person at the entrance of the enclosed compartment during enclosed space entry is A. The heavier water in top drum flows back to the bottom drum through the down. A diffuser is provided at the end of a mechanical atomizer in boiler onboard A.comers outside the furnace B. To mix the air and fuel properly C. To alert others in case of untoward emergency B.type boilers. To provide first aid to injured person C. To allow steam flow during start up C. Steam stop valve is eased of its seat during boiler start up from cold A. 78. All of the above. Which of the following statements about the design of D.D. To allow thermal expansion of parts B. Air ingress into the system B. To eject the excess fumes from the atomizer 75. High cooling water temperature going to the condenser D. Excessive refrigerant charge 76. To prevent blow back of the flame B. All of the above 77. To prevent water hammer D. Inside the furnace the water is heated up in the risers . None of the above 74. is false? A. A leaking solenoid valve C. To assist for the work carried out in the enclosed compartment D. If the watch keeping engineer encounters a Main Engine Slow down alarm he should__ A. Presence of catalytic fines in fuel oil is significant to engineers on board because_ A. Polyurethane coatings C. Catalytic fines necessitate increase in storage temperature 82. Full bore angle valve 83. A partial opening of which of the following kinds of valves can lead to wire -drawing of its seat? A.rectify it in consultation with senior engineers and then prepare for restarting the engine C.investigate the fault .C. Butterfly valve C. Gate Valve D. Globe Valve B. Thermostatic trap . Catalytic fines necessitate increase in injection temperature D. Which of the following types of coatings used in tanks of a chemical carrier provides a comprehensive protection against most solvents? A. D. Zinc silicate D. Which of the following types of steam traps uses the pressure energy of the steam to close the outlet ? A. Immediately cancel the slowdown in the control panel B. He need not take any action and wait for the alarm to resolve on its own and then cancel the slow down 80. He should raise engineer's alarm and wait for all engineers to reach the engine room D. If navigation circumstances permit. Phenolic resins 81. The upper drum is the steam/water drum and the lower one is the water drum. Epoxy coatings B. The feed water is pumped into the lower drum 79. Catalytic fines lead to abrasive wear in liners . piston rings and fuel injection equipment C. Catalytic fines tend to impair proper operation of purifiers B. after consulting chief engineer he should tell bridge to stop engine . Thermodynamic trap C. By the boiler feed water pump B. By a circulating pump outside the boiler C. Aluminum Brass C. To prevent damage to machinery which has been switched off D. Mechanical trap D. Amount of salt water leaking from condenser if any C. The seating material for perfectly sealing type Ball valves is usually made up of A. Salinity of distilled water produced from fresh water generator onboard depends on A. How is the water circulated between water and steam drums in a water tube D.B. Gunmetal 87. Due to difference in densities of water and steam D. None of the above 88. Temperature of the sea water used D.type boiler? A. To quickly restore the failed power supply in order C. Cupro-nickel B. Rubber . Admiralty Brass D. Sequential starting of machineries after black out in engine room is necessary A. Vacuum trap 84. Amount of feed set in fresh water production B. All of the above 85. Which of the following is the material used for manufacturing tube plates of a shell and tube type heat exchanger? A. Efficiency of brine ejector from the evaporator shell 86. To prevent overload of Generators B. 1. Rubber reinforced with steel wire D. CONDENSATING 90.COLLECTING. Water leaking from a pump packing gland is kept away from the bearing housing by the use of shaft sleeves lantern rings water defectors water flinger water seals SECTION 4 TAKEN FROM DG SHIPPING OLD QUESTION 1. Air is removed from refrigeration system by (1) ________ at receiver after (2) ________ (3) ___ Gas in receiver. PURGING 2. 3. vent off any accumulated air from the system drain off any accumulated water from the pump casing prior to its being started assist the complete removal of hydraulic oil from the system prior to opening for major or minor repairs prevent damage due to agitation and overheating of oil accumulated in the casing as a result of minor internal leakage . A casing drain is provided for axial piston and bent axis variable stroke pumps to ___________. PTFE or Nylon C. Stainless steel 89. Which of the following conditions should be used to support the need to change the lube oil when there has been an increase in the neutralization number? A decrease in the viscosity of the oil An increase in the viscosity of the oil A change in the cloud point A change in the floc point 2.B. Measure the distance between the gland and the stuffing box with a rule. 8. dew point temperature condensation temperature psychometric temperature absolute humidity temperature 6. regular sound. Increasing the speed of a rotary pump above its rated speed will result in most of the following conditions to occur?188 Increased suction Increased clearances Vibrations slippage 4. To provide a ready means for the entry of cooling water. One function of the air receiver in a compressed air system is to _____________. To protect the operator performing the maintenance. The temperature at which water vapor in the atmosphere begins to condense is called the ____________. Open the drain connection to allow seawater to flow in and make the distance even. Why should a person performing maintenance on an air compressor wire and tag the system valves closed? To prevent the unexpected. To protect the equipment. 5. dry the air discharged from the intercooler minimize the system's line pulsations receive exhaust air from pneumatic accessories remove all traces of oil from the air 7. To allow repair or replacement of the primary seal elements when the ship is waterborne. Which of the following statements describes the purpose of the split inflatable seal installed aft of the primary seal assembly for the propeller shaft?197 To serve as a seal when adding packing to the stuffing box.3. which of the following procedures should be observed to insure even tightening of the gland?193 Listen for a smooth. Judge by feeling the gland for an increase in heat as it is being tightened up. Each of the above is correct. . To eliminate leakage via the propeller shaft when the shaft is not rotating. After packing is added to the stern tube stuffing box. Some of the following are preferred refrigerants of the future (a) Carbon dioxide (b) Refrigerant 11 (a) (b) (c) (d) Refrigerant 502 Ammonia Bromine Argon 14. In the air conditioning of a ship a “Comfort Zone” constitutes (a) Low humidity. (d) Between any valve and a nozzle. (c) Between a non-return valve and a U-bend of a pipe. (b) Between a non –return valve and a screw down valve. The passenger spaces of a passenger ship is protected against major fires by a (a) High expansion foam system (b) High density CO2 system . (a) Which can be closed manually. moderate humidity 15. moderate temperature (c) High humidity. low room temperature (b) Low humidity. At which of the following locations would a duplex pressure gage most likely be located? Fuel oil service pump discharge flange Fuel oil strainer Fuel oil heater Fuel oil flow meter 12. secure and tag the electrical circuit place a crow bar in the flywheel of the unit inform all persons in the area not to start the unit make a log book entry 11. 13. moderate temperature (d) Very low temperature. In any air system a safety device should be placed between any two points where air can be trapped between any two valves. stuffing box diameter direction of rotation of the screws pitch of the screws type of driving gears 10. The FIRST thing to do to ensure that a refrigeration unit will not start while undergoing repairs.9. is to ____________. One of the main differences between the various types of screw pumps is in the __________. (d) High pressure steam system. fire insulation and elabrate sprinkler system. All of the above. fill the unit with saltwater fill the unit with descaling compound completely drain the unit tightly seal the unit to exclude air 21. (d) for use as grinding paste in case of emergency. fire retardant. Which of the following guidelines is considered to reflect good design practices of shipboard steam heating systems? Provide constant steam service for equipment operating throughout the year. discharge end being smaller than the suction end small size of impeller lack of moving parts ease at which the wearing rings may be changed 20. Run all piping so it may be drained by gravity. when compared to other pumps. ‘A-1 class bulkhead. When securing a flash-type evaporator for an extended period of time.(c) By a mixture of fire detection. is the _____________. (c) for making the floor anti-skid by giving more friction. Sand impregnated with chemicals is kept in metal containers with a shovel. consumes the greatest amount of power while producing the greatest amount of heat? Overcoming sliding friction Overcoming rolling friction Overcoming fluid friction Overcoming oil wedge friction 18. Which of the processes listed. in the engine room. for the following purposes (a) to cover small oil spills (b) to use along with cement for doing repair jobs. fire doors. A distinguishing feature of an eductor. inner tube braided inner layer(s) outer cover . Provide either a common or individual reducing station for each group of units requiring the same operating pressure. 17. 16. you should _____________. is the ______________. 19. The portion of a hydraulic hose that determines its overall strength. two years 3. one year 2. Which of the following actions. Which features of a centrifugal pump reduce the need for renewing worn impellers and pump casings? Close radial clearance between impeller hub and casing Low rotational speed of impeller Removable end plate Replaceable impeller and casing wearing rings 23. Changing over to stand by filter if provided D. Back flushing the filter manually B. and must maintain the book as per rules on board for _______________. outer armor 22. SECTION 5 1. The drain connection is left opened. pertaining to saltwater lubricated stern tube stuffing boxes. Inert Gas System should be capable of delivering Inert Gas at the rate of at least____________________________ . three years 4. A high pressure differential in a main engine fuel oil filter onboard can be best reduced by A. four years 25. The packing is adjusted for greater cooling or replaced. The stuffing box gland is tightened. None of the Above 2. 1. An acceptable method of dealing with accumulated oil found in the pump room bilges is to ______________. is usually observed when the ship is expected to be in port for an extended period? The stuffing box is continually flushed. A ship is required to carry an Oil Record Book. Stopping the main engine to change the filter element C. transfer the oil to the sea chest pump the oil into the slop tanks discharge the oil over the side on an outgoing tide pump the oil into a clean ballast tank 24. A. Use heaving line to prevent moving of item C. Two compressors should not be run in parallel because A. Use chain block if required to restrain moving of parts D. 110% of the maximum rate of cargo discharge capacity of the ship B. The term referring to the number of teeth per inch on a hacksaw blade is known as the A. amount in inches of mercury the total suction head is below atmospheric pressure 4. rake C. distance of the suction liquid level above the center line of the pump B. None of the Above 5. Set B. Use additional lifting equipments B. 90% of the maximum rate of cargo discharge capacity of the ship 3. A and B ans c only 6. When overhauling engines in bad weather onboard A. is an indication of the amount of noncombustible material present in the oil . 125% of the maximum rate of cargo discharge capacity of the ship D. thread gauge 7. 133. The static positive suction head of a pump is the A. There is possibility of losing oil from the compressors D. It will give over capacity in the system C. pitch D. It is not efficient to run two compressors B. force necessary to overcome frictional losses in the pump and piping D. distance the suction liquid level is below the center line of the pumps C. The ash content of a fuel oil is significant to the operating engineer because it 117 A.33% of the maximum rate of cargo discharge capacity of the ship C. reflects the overall thermal efficiency of the fuel oil service system 8. Sailing C. Growth of microorganisms and bacteria harmful to human beings B. Which of the following components in an Inert Gas system ensures that vapours are vented well clear of the working deck? i) High velocity vents ii) Mast risers A. block all control system relays closed B. you should always A. Decrease in sea water temperature C. All of the above 9. Inerting operations in oil tankers 12. close all manually operated fuel valves D. Only i) . Air conditioning system air handling units must have their air filters cleaned at regular intervals in order to prevent______ A. is useful for determining proper atomization temperatures D. Amount of distilled water produced in fresh water generator onboard decreases with A. Soot blowing of boilers onboard can be carried during A. Before any work is to be carried out on a burner in an automatically fired auxiliary boiler. allow the boiler to cool completely C. Growth of mites and other allergens D. lock all safety interlock switches closed multi a c d 11. Increase in vacuum in the fresh water generator shell B. Port operations B. Restriction to air flow and hence reduced efficiency of the plant C. During indications of a uptake fire D. indicates the quantity of energy released by burning a unit amount of the fuel C.B. Increase in sea water temperature 10. Decrease in efficiency of heat exchanger D. Any one or a combination of above 16. Only ii) C. Which of the following is most suited to act as a deck air compressor? A. By fitting of flash back arrestor B. Unburnt Hydrocarbons D. Reciprocating type C. Fail-safe . They are said to beA. By using trolley???s when transferring cylinders D.some valves continue locked in the position they were at the time of failure . Safety of Gas cylinders used for cutting and welding is ensured A. By using color codes for gas pipe connections C. Injecting water into the combustion chamber of marine engines is a primary method of reduction of which of the following air pollutants? A. Gravitational Head B. 15. Lobe type B. All of the above. Pumps impart energy to a fluid but the energy required to bring the fluid to the pump may be provided by________________ A. NOx 17. Both i) and ii) D. None of the above 14. Atmospheric pressure C. Neither I) nor ii) 13. Screw type D. SOx B. Particulate matters C. In case of failure of control air supply . Another pump D.B. B. Fail-set D. A more simplified cooling circuit. All of the above 22. To safeguard the chief engineer???s competence D. Magnesium Stearate D. Sodium Stearate B. Fail -proof C. The suction line of the compressor will be too cold C. Old machinery space log book are kept in safe custody A. If the superheat value of a thermostatic expansion valve is set too low________ A. Presence of moisture in the boiler before startup B. Sodium Bicarbonate C. Magnesium Bicarbonate 21. It allows better control of temperatures by using fewer controllers D.corrosion is minimized C. Which of the following chemical compounds prevents caking of powder in dry chemical powder fire extinguisher? A. For purpose of internal and external audits C. The primary advantage of a central cooling system is______________________ A. The discharge line of the compressor will be too cold 20. Rapidly fluctuating temperatures inside boiler furnace . To refer and clarify in case of any query B. Refractory damage in boiler furnace onboard is caused due to A. Most part of the cooling system being fresh water based. The suction line of the compressor will be too hot B. The discharge line of the compressor will be too hot D. Fail -blocked 18. B. None of the Above 19. the requirement for short laterals run C. all of the above 25. Switching of the relevant pump and system valves C. Gear Pump . Centrifugal pump B. Overheating of boiler tubes due to lack of heat transfer from tubes due to scale D. Ensure combustion parameters maintained normal D. Worn wearing rings D. Heavy fluid in the flow stream 24. Which of the listed conditions can lead to cavitation in a centrifugal pump? A. Boiler panting and vibrations 23. Which of the following type of pumps is most suited to act as Waste Oil Sludge Pump? A. Closing of inlet and out let valves B. To maximize the effectiveness of soot blowing onboard A. None of the above 26.C. All of the above 27. Screw pump C. Rough casing volute surfaces C. Isolation of filters onboard prior to cleaning is done by A. A major controlling factor in the location of the condensate return piping from a heating system is/are 169 A. the requirement to minimize conflict with headroom and other services D. Vapor pockets formed in the suction flow stream B. the requirement for a gravity return B. Opening of drains and vent valves D. Ensure Boiler is firing at high load B. Ensure Boiler is firing at low load C. None of the above 31. Construction portfolio 32. Keep first aid equipment ready D. A record of the types and strengths of steels used on a MODU must be included in the A. The valve at the water outlet is opened on the basis of signal of water content to the control unit from the water transducer at the clean oil outlet D. filling the auxiliary boiler with cold water B. The valve at the water outlet is opened periodically based on timer action C. Wear dry clothes B. Progressive cavity pump 28. steam admitted to a cold pipe C. Certificate of Inspection D. In the Alcap principle of centrifugal separation______________________ A. To prevent electric shock during electric arc welding multi A. The centrifuge works as a clarifier with no water outlet 29. General plans B. Overcharge C. Improper cooling due to a dirty condenser B.D. High pressure cut out of a refrigerant system can activate due to which of the following faults? A. filling the auxiliary boiler with hot water D. Wear insulated shoes C. Air in the system D. draining a soot blower line before cracking the steam supply valve . Water is only discharged when desludgeing is activated by the control unit B. All of the above 30. Water hammer in a steam heating system can be caused by A. Builder's documentation C. Thrust shaft and stern-tube shaft D. Increasing scavenge air temperature D. Decreasing cylinder oil feed rate 37. Shrinkage . Line shaft and thrust shaft B. are connected by the inboard stern tube shaft coupling? A. Isolate the discharge side from the suction side D. Stern-tube shaft and tail shaft 35. An auxiliary engine turbo-charger makes strange noises when the load changes. Using high TBN cylinder oil C. Misalignment B. Which of the following can be done to reduce the cold corrosion of Main Engine cylinder liners using high sulphur fuel oil :A. Which combination of the main shaft segments listed below. Seal pump shaft against entry of air C. Absorb erosion of high velocity discharge stream B.33. Increasing cylinder oil feed rate B. Would you (a) Continue to run the engine and wait for some time (b) Stop the engine for a while and make some checks (c) Reduce the load of the engine (d) Run it on steady load to make some checks. What is a function of the wearing rings used in most centrifugal pumps? A. An external examination of turbocharger parameters as stated in the manual also reveals nothing. Line shaft and stern-tube shaft C. Dampen the turbulent discharge flow 34. Contamination C. The engine parameters however are absolutely fine. Which of the following can lead to premature failure of roller bearings? A. that are located furthest from the main engine. 36. collecting of steam B. Sewage Plant Efficiency is gauged by a) Suspended Solid b)Coli count c)Biological Oxygen Demand(BOD) d)All 41. B. all of the above 42. collecting of precipitated salts of water 43. all of the above 40. Boiler not starting in 2 -3 times. Steam drum is used for A. check furnace D. Hot plating B. check fuel burning system C. density of water is reduced D. check fuel ignition system. corrosion of tubes C. A. Over greasing 38. Explosion bonding D.D. Steam drains should be . When oil carried over in steam drum A. collecting of water C. Electrolysis C. Metal spraying 39. B. what we do. WHICH PROCESS IS NOT DONE ON MILD STEEL? A. overheating of tubes. equalising water in the tubes D. sealing C.A. When the crankcase temperature has changed substantially during the process of taking the readings. sealing . purifier feed rate. running two purifier in series one acting as purifier and other as clarifier 47. sealing D. Gland packing. When the draught of the vessel has changed while readings were being taken B. Fitting exhaust valves with valve rotators C. Lube oil. filling pump casing using a fresh water hose C. short lateral length C. None of the above 46. attached vacuum pump. None of the above 45.O. Attached Vacuum pump. Vacuum priming pumps which work on the principle of fixed vane pumps require ________ for___________ clearance between vane tips and casing. Which of the following will be required to be done in order to reduce sulphur corrosion of Main Engine Components? A. A. Gravity tank. Central priming system. sea water priming D. lubricating B. The crank web deflection readings of a diesel engine would be erroneous in which of the following conditions? A. When cargo loading and discharging has been too rapid C. Decreasing the F. Water. attached vacuum pump B. Which of the group of method are used for priming of centrifugal pumps onboard ships? A. Increasing the atomization pressure of fuel injectors B. should cover less head space D. D. Lube oil. Running engine at or near normal sea load D. drained by gravity B. all of the above 44. Filter dirty D. It is cheaper and easier to manufacture D. A refrigerant compressor will run continuously when there is A. 53.? A)out of engine room b)self priming c)power should be outside e/r d)all the above 50. Insufficient refrigerant in the system D.. Any of the above 52. Cause why cascade tank water temperature is high? OR What could be the reason why the feed pump can hardly pump in water to the auxiliary boiler causing the cascade tank water level to rise & temperature too high? A. Too heavy cooling load on the system B. Clogged condenser water tubes C. Fretting Corrosion 49. Double entry impellers have a distinct advantage over single entry impeller. Air in the system C. It gives a higher pumping efficiency C. High ambient temperature B. Corrosion fatigue C. The common term used for failure of metal and alloys in a corrosive environment . Stress corrosion cracking D. Low cascade water level. when subject to high stresses is known as : A. They balance out the axial thrust B. Fatigue failure B. The need of installing line bearing onto the pump shaft is eliminated 51. What is it? A. about emergency fire pump.48.. Where is the location of the backfire valve? . Combination of chemical or physical action 58. Pump is not operating satisfactorily and pumping capacity is too low B. Too cold hydraulic oil 55. throttling of discharge valve is required C. What attachment can you find in air reservoir? I – Safety/Relief valve II – Fusible plug III – Bursting disc 57. Pump is operating normally 56. It is seen that suction pressure is positive and discharge pressure is very low compared to rated discharge head. The lowest temperature at which a liquid as listed on the MSDS. Pump is not operating satisfactorily and pumping capacity is higher than rated. Boiler furnace B. Scavenging area C. Physical action C. A ballast pump is being used to deballast a fore peak tank which is full. Pumping capacity is not affected by suction and discharge pressures D. the reason why the windlass cannot lift the anchor up is A. Gas cylinder 54. Chemical action B. Cavitation erosion occurs due to A. Windlass defective by pass valve C. A. gives off enough vapor to ignite in the presence of an ignition source is called its _______. Low lube oil tank level B.A. During departure from a 2 weeks anchorage. It indicates that: A. Anchor drag sunken object D. Flash point . Chemical OR physical action D. Loss of lube oil SECTION 6 JANUARY 2013 1.. None 59. Fire point C. . Piston cooling water high temp D.. All below points B.. Ignition point D. When main engine is running in emergency condition which of the alarm can’t be bypassed. Boiler secondary drum pressure .than primary drum pressure A.. JCW high temp C... the names of all persons on board C. every event occurring on board 2... All 2 Why we do not prefer to run air two compressor together because A. A. Forward seal ring of forward seal assembly damaged or sealing disturbed by foreign object. the date and hour of each fire drill B. Too much power consumption D. only casualties which occur while underway D. LO low pressure B... Less B. A simultaneous rise in stern tube forward seal tank and drop in level of header tank indicates_ A.B.. Equal 61. Too much maintenance C. More than C. The master or person in charge of a MODU is required to log A. Aft seal ring of forward seal assembly damaged or sealing disturbed by foreign object B. Primary steam drum B. Solar gain B. Corrosion rate is affected by temperature 6.heater D. Risers C. Super.type water tube boiler with a secondary steam drum and super. Which of the following statements is FALSE regarding gas carriers? A. Gas carriers do not use ship's main boilers for generation of inert gas. B. Which of the following statements is false about corrosion due to galvanic action? A. Zinc is anodic to steel and is often used as a protective coating D. C. None of the above 3. In a D. When any single metal exists in a system. Gaseous nitrogen is produced on board in many gas carriers 7. B. Which of the following factors will have the greatest effect on the heating load within a conditioned space? A. Shipboard generation of inert gas for inter tank barriers and holds is a requirement . Metals close to the anodic end of galvanic series corrode in preference to the ones close to the cathodic end. C. White metal in the crankcase B. Any of the above 4. Secondary steam drum 5. D. the steam is heated above the boiling point of water in the _______ A. Infiltration and ventilation air . it cannot corrode due to galvanic action. Shipboard generation of inert gas for cargo tanks is a requirement . Knocking sound from the engine crankcase D.heater.C. White metal in the lube oil filter C. Either of the above D. Bearing damage in a diesel engine onboard is indicated by A. Keep adequate first aid equipment at the entrance C. Surging indicates A. a pressure gun D. a zerk fitting 13. gravity flow B. thread dial indicator is zeroed 12. carriage stop clamp is tightened D. Type of the tank is fitted semi and fully pressurized gas carrier A. Entertainment equipment within the space 8. None of the Above 9. spring force C. Type a and b D. In a compression type grease cup.C. exhaust manifold fire C. During major repair work in enclosed space onboard A. carriage clamp screw is loosened C. Type b C. you must be certain the A. All . Occupants inside the space D. Scavenge fire B. None 14. Type a B. Before the longitudinal carriage feed of a lathe is engaged. Fault in fuel system D. Provide refreshments D. the lubricant is forced into the bearing by A. Keep log of entry and exit time of personnel B. spindle clutch is disengaged B. A. Fuel injection C.15. The fuel will ignite even it has not reached point of ignition 2. Contamination of cargo B. A drop in compression pressure in one cylinder of a diesel engine can be caused by ___________.1 1. Exothermic reason D. Excessive temperature will cause the oil to crystallize resulting in pulsating fires C. Chemical carrier B. Excessive temperature will increase oil viscosity that results to poor combustion B. Hydride formation in gas carrier can lead to a A. The fuel will carbonize and its heating ability will be reduced D. Engine cylinder relief valve lift indicates abnormal of what. Seize of pump C. Which of the following statement is true if the oil temperature is allowed to become excessively high in the heaters? A. Fuel supply B. None 17. Deep well cargo pump used in A. Exhaust temp D. only fuel injection b. All SECTION NEW . LNG D. Exhaust pressure 16. a. Product carrier C. burned valves . II only C. too late fuel injection d. That there is an overloading of cylinder b. I – Boilers to be laid up wet should be completely filled II – All fuel tanks should be cleaned & gas freed III – All potable water tanks should be cleaned & disinfected A. That there is an increase blow-by of the cylinders d. I & II D. I – Decrease salinity II – Increase salinity III – Decrease alkalinity A.c. That there is an overloading of the adjacent cylinder c. That there is an incomplete combustion in that cylinder Which of the listed actions should be carried out if a ship is to be laid up for an indefinite period of time ______. low fuel penetration Some diesel engines are fitted with a thermometer in the cooling water outlet from each cylinder. I only B. I. II & III . I & II D. I. what should you suspect? a. If the cooling temperature from an individual cylinder begins to rise. II & III Adding trisodium phosphate in boiler water will _______. I only B. II only C. bubbles in the sight glass Directional control v/v used in hydraulic p/p is contrlled a)manually b)mechanically c)electrically d) all 1.04% Nickel B.A shortage of refrigerant in the refrigeration system is indicated by ___________.04% Cobalt C. A.04%Arsenic D. the compressor running too fast D. 0. 0. served by a single two conductor cable D. a. protected by a circuit breaker set at 125% and a thermal overload device B. high head pressure c. provided with a running motor overcurrent protection device C. excessive operating hours without carrying out preventive maintenance C.04%Tungsten One cause of leaky valves in a low pressure air compressor may be attributed to A. 0. high suction pressure d. running with an air filter element different from that required by the original manufacturer's specifications B. 0. the compressor short cycling b. excessive discharge pressure . served by two feeder circuits Dezincification of brasses may be prevented by introducing which of the following additives during manufacturing brass? A. Electric and electro-hydraulic steering gear motors are required by Coast Guard Regulations (46 CFR) to be _________. liquid levels of the suction and discharge Plate type heat exchangers are preferred over shell and tube type ones because____________ A. 110% of the maximum rate of cargo discharge capacity of the ship B. Their capacity can be altered by adding or removing plates. Butane . Turbulent flow and more margin for increased fluid velocity ensures less deposits and hence longer time interval between cleanings. Overloading of generators B. D.allowed by gas codes. LPG B. 90% of the maximum rate of cargo discharge capacity of the ship Preferential tripping of electrical machineries prevents A. 125% of the maximum rate of cargo discharge capacity of the ship D. All of the above Inert Gas System should be capable of delivering Inert Gas at the rate of at east_________________ A. C.33% of the maximum rate of cargo discharge capacity of the ship C. to be burnt in ship's boilers? A. Allows starting of large machineries D. centerline of the pump and the level of the liquid in the suction well when the source of liquid is below the pump B. Black out in engine room C. None of the above Which is the only gas product . centerline of the pump and the level of the discharge liquid D. 133. They can be cleaned more thoroughly . B. centerline of the pump and the suction liquid level when the source of liquid is above the pump C.The static suction lift of a pump is the difference in elevation between the A. Ethylene C. Insufficient air charge D.stop feed.Stop feed-give sealing water-close sealing water -shut operating water-open and close desludging water quickly B.in & cutting -out of a fresh water pump on a hydrophone system indicates which of the following? A.Stop feed.open and close desludging water quickly 3.You must have worked with mooring winch and windlass hydraulic systems.In case of failure of the control system of a centrifuge. Water cooled plate or shell type heat exchangers D. Stainless steel tubes D. The differential setting between cut-in and cut out is too low Economisers are built up with A.Liquid ring primer used for priming main and emergency fire pumps onboard . There is no cooling arrangement as the system doesn???t require cooling B.D. Copper tubes B. LNG Frequent cutting. Plain steel tubes C. Steel tubes fitted with shrunk on C. Radiator and fan arrangement 1.open sealing water for a short time then close-open and close desludging water quickly D.the correct sequence for manually desludging a purifier would beA.I. grills single d 35.Shut operating water.shut operating water-open and close desludging water quickly C. Excessive air charge C. Air cooled hydraulic reservoir C.Shut operating water-stop feed. The cooling of hydraulic oil for the above system on large merchant ships is provided by: A. Nothing abnormal B. Inert Gas System on board tankers is used during which of the following operationsA.A.Subsequent to a oil spill in Engine Room and ingress of oil in the bilge wells . Inerting of empty tanks B.To prevent main engine stoppage during periods of bad weather A .Is to be capable of automatic engagement and disengagement with drive shaft C. At the refrigerant exit end of evaporator of each chamber B.the best course of action is to _______________________________ A .To prevent electric shock during electric arc welding A.At the refrigerant exit end of evaporators of chambers with lower temperature settings D .Is to be filled with water in the water tank to maintain water level B. All of the above 23. Ensure over speed trip override switch set up to rough sea setting C .Wear dry clothes B.Wear insulated shoes C.Ensure reduced speed setting to prevent overload D. At the refrigerant exit end of evaporators of chambers with higher temperature settings C .All of the above 22.Back pressure valve in a refrigeration system with multiple chambers is fitted_____________ A.None of the above 7.Ensure lube oil level is topped up B.None of the above 6.Is to have sufficient capacity to exhaust air out from pump in all sea conditions D.All of the above.Keep first aid equipment ready D. Purging before gas freeing D.Use oil spill dispersant chemical in the bilge wells . Inerting during crude oil washing C. 5. Decrease in sea water temperature C.An economizer uptake fire in the engine room is extinguished by A.which of the following is a suitable control measure? A.Amount of distilled water produced in fresh water generator onboard decreases with A. Transfer the oily mixture and let it settle in the bilge holding tank/bilge separator tank C .B. Boiler panting and vibrations 4. None of the above 3.Decrease in efficiency of heat exchanger D. Rapidly fluctuating temperatures inside boiler furnace C.In case of an exhaust gas boiler fire .Increase in sea water temperature 1.Refractory damage in boiler furnace onboard is caused due to A. Start frequent soot blowing B. Injecting fixed fire fighting system if provided C.Transfer the oily mixture using a portable pneumatic pump to a waste oil tank and then physically demark and clean the bilge wells using environment friendly cleaner D. Stop cooling water circulation to avoid leakage D. Presence of moisture in the boiler before startup B. Overheating of boiler tubes due to lack of heat transfer from tubes due to scale D. Boundary cooling of the uptake B.Increase in vacuum in the fresh water generator shell B. Injecting water from the uptake D.Dilute the bilge wells by flooding with water and then use the general service pump to pump out the bilges 24. None of the above LNG STORAGE AND PUMPING DETERMINED BY WHAT PROPERTY . Increase main engine speed to blow away the soot particles on fire C. the refrigerant absorbs the latent heat of vaporization in the -compressor -condenser -receiver -evaporator 6. The only means of removing the latent heat of condensation from a refrigerant in the normal refrigeration cycle is by -passing it through the expansion valve -condensing refrigerant in the system condenser -passing the gaseous refrigerant through the heat interchanger on the suction side of the compressor -maintaining a high pressure on the system's receiver 7. is defined as the latent heat of -fusion -vaporization . when air attains the maximum amount of moisture it can hold at a specific temperature. The heat required to change a substance from a liquid to a gas without experiencing a temperature change. The temperature at which water vapor in the atmosphere begines to condense is called the -dew point temperature -condensation temperature -psychrometric temperature -absolute humidity temperature 5. The heat required to change a substance from a solid to a liquid while at its freezing temperature. In a refrigeration system.a. In reference to air conditioning. it is said to be -superheated -saturated -condensed -convected 3. Which of the following terms represents the form of heat removed from the refrigerant in the condenser of a refrigeration system? -latent heat of vaporization -heat of compression -superheat -all of the above 4. PARTIAL VPR PR 1. VAPR PR b. is known as the latent heat of -fusion -vaporization -condensation -sublimation 8. Which of the refrigerants listed is considered safe and ideal for most marine applications? -R-21 -ammonia -R-12 -sulfur dioxide ans c n its r 22 2. is called the -absolute humidity -relative humidity -specific humidity -total humidity 14. The amount of moisture in a given sample of air.remove the oil with a portable charging cylinder 16. When replacing ball bearings on an electric motor shaft. When handling contaminated oil from a hermetically sealed refrigeration compressor unit that has burned out its motor. and subject to the exposure of refrigerants should wear -face shield -a respirator -rubber gloves -an all purpose gas mask 12. The moisture sensitive element of a humidistat can be made of -hair -copper -plastic -steel 15. you should -tap the outer race with a mallet -apply even pressure to the outer race -apply even force to the inner race -apply pressure evenly to both the inner and outer races .store the oil in a clean refrigerant drum b. Heat which brings about a change in the physical state of a substance without a change in temperature.use rubber gloves c. Personnel working with refrigeration systems. is called -specific heat -sensible heat -latent heat -ambient heat 10.-sublimation -condensation 9. to the weight of moisture that the same sample would hold if saturated. Latent heat can be defined as the heat which must be added to a substance in order to change it from a -solid to liquid -liquid to vapor -solid to vapor -all of the above 11.circulate the oil through a filter drier d. The ratio of the weight of moisture contained in a given volume of air. you should a. when compared with the amount of moisture the air could hold if totally saturated at the existing temperature of the sample. is called -absolute humidity -specific humidity -effective humidity -relative humidity 13. For the proper control of the air temperature in an air conditioning system using chilled water circulation. nonflammable. When the relief valve opens it discharges high pressure refrigerant vapor to the -liquid strainer -refrigerant inlet of the condenser -inlet side of the evaporator -suction side of the compressor 21. Ammonia when used as a refrigerant is valuable because of its high efficiency. it is however -toxic -flammable -explosive -all of the above 19.acid formation b.17. People familiar with ammonia refrigeration systems become accustomed to its odor and may forget that the vapors -in a low concentration can cause death -will dissolve in pespiration and cause caustic burns -will burn or explode -all of the above 18. which of the listed refrigerants will break down and produce phosgene gas? -CO2 -methyl chloride -R-22 -sulfur dioxide 20. In the presence of an open flame or hot surfaces. which of the listed conditions should remain constant regardless of load changes? . chlorinated fluorocarbon refrigerats decomposes and form -petroleum crystals -phosgene gas -water vapor -carbon monoxide 22. or an electric heating element. A refrigeration system contaminated with moisture can be affected by A. and nonexplosive refrigerant. however. It can. When subjected to high heat from an open flame. nontoxic.sludge formation c.all of the above 24. R-12 is generally considered to be a safe. become highly toxic when -superheated outside the system -in contact with an open flame -heated to the boiling point -all of the above 23. Some chloronated flourocarbon refrigerants may decompose into a toxic irritating gas if it is -stored at temperatures below 10C -charged into a system having copper fittings -allowed to mix with compressor oil -exposed to an open flame or hot surfaces 25.ice in the expansion valve d. a box is normally changed from chill to freeze by adjusting the -hand expansion valve -compressor suction valve -solenoid bypass -back pressure regulating valve 30. A pressure drop in the liquid line of a refrigeration system may cause -the solenoid valve to seize -the compressor to hunt -flash gas to form in the liquid line -the expansion valve to freeze open 31.-chilled water system supply temperature -chilled water system return temperature -compressor discharge temperature -compressor suction pressure 26. Which of the listed operations will cause an automatically controlled Refrigeration compressor to restart? -closing of the solenoid valve -closing of the expansion valve -an increase in the suction pressure -decreasing the suction pressure 28. Moisture in a refrigeration system can cause -freezing the expansion valve closed -corrosion of system piping . Moisture is removed from a refrigeration system by -bleeding refrigerant from the condenser -opening a drain petcock on the oil separator -condensing the water in the heat exchanger -using a dehydrator cartridge 32. Moisture entering a typical refrigeration system will most likely -boil in the condenser -be removed by the liquid line strainers -cause sweating and frost on the evaporator coils -freeze in the expansion valve 34. the compressor is set up to cycle on and off by the -pressurestat -high pressure cut out -solenoid valve -low pressure cut out switch 27.In a direct expansion type multi-box refrigeration system. Saltwater is typically provided to a refrigeration system to -cool the expansion valve -prevent refrigerant superheating -condense the refrigerant gas -prevent motor overheating 29. Moisture in the refrigerant may -freeze on the expansion valve seat and reduce the flow of liquid refrigerant -emulsify the oil in the condenser -freeze in the king valve -clog the oil trap 33. In a direct expansion type cargo refrigeration system. This means -the system is fully charged -there is air leaking in from the condenser -ice crystals are forming in the refrigerant -the system contains less then a full charge of refrigerant 41. the cause may be due to -a shortage of refrigerant -the compressor running continuously -liquid refrigerant returning to the compressor . In an operating refrigeration system low on refrigerant. Some refrigeration systems have chemical moisture indicators installed in conjunction with the sight glass in the liquid line. It is generally located in the -high pressure liquid line -low pressure liquid line -high pressure vapor line -low pressure vapor line 38. If the refrigeration compressor crankcase is sweating. A liquid indicator sight glass is useful in determining whether or not a refrigeration system is sufficiently charged. If excess moisture is present in the system. the indicator will -activate the driers -change color -secure the compressor -add the predetermined amount of liquid drier 37. there is -too much refrigerant in the system -oil entrained in the refrigerant -less then a full charge of refrigerant in the system -ice crystals forming in the refrigerants 39. A liquid sight flow indicator in a refrigeration system is examined and gas bubbles are noted in motion with the fluid flow. A sight glass is installed in the liquid line to indicate the condition of the refrigerant charge and may also indicate the -condition of the expansion valve -moisture in the system -condition of the compressor suction valves -condenser temperature 40. If a liquid sight flow indicator in a refrigeration system shows gas bubbles in motion passing inside of the glass. a liquid line sight glass will -be clear -be blue -be light green -show bubbles 42.-improper temperature regulation -all of the above 35. Which of the problems listed could be indicated if a sight glass in the refrigerant liquid line is full of bubbles? -proper refrigerant charge -faulty expansion valve -insufficient refrigerant -solenoid valve stuck open 36. Refrigeration system compressor crankcase sweating is an indication of -insufficient lube oil circulating throgh the system -excessive circulation of lube oil through the system -insufficient refrigerant in the system -an overworked compressor 48. If a refrigerating compressor crankcase is sweating.-the compressor short cycling on the high pressure cutout 43. If the suction line between the evaporator and compressor is frosting up. the cause may be due to the thermal expansion valve -thermal bulb coming loose from the suction line -needle valve is stuck closed -thermal bulb is in a cold air stream -all of the above 44. the trouble could be caused by -excessive superheat -a minor amount of air in the system -normal oil circulation with the refrigerant -the expansion valve being stuck in the open position 45. Crankcase sweating in a refrigeration system is caused by -a stuck solenoid valve -a shortage of refrigerant -too much oil in circulation -too much superheat 50. Properties of good refrigeration oil include -low wax content -high pour point -high viscosity -all of the above 51.Frosting or sweating of the suction line of a reciprocating refrigeration compressor indicates a condition which could result in severe damage due to -minor amout of oil in the refrigerant -liquid slugging -insufficient refrigerant -a failed heat interchanger 46. Oil separators installed in refrigeration systems serve to -remove excess oil from the system -remove oil entrained in high pressure liquid line -return oil entrained in refrigerant vapor back to the compressor crankcase -all of the above . This is an indication of -a shortage of refrigerant in the system -air in the system -an accumulation of liquid refrigerant in the crankcase -a shortage of oil in the crankcase 47. A refrigeration system compressor crankcase is sweating or unusually Cold. Sweating of the refrigeration system compressor crankcase is caused by -too much superheat -insufficient superheat -suction pressure too low -excessive refrigerant returning to the compressor 49. A thermostatic expansion valve is properly controlling evaporator superheat. The purpose of the low pressure cutout switch is to -maintain liquid refrigerant at the suction of the compressor -maintain a preset suction pressure to the compressor -start and stop the compressor at preset operating pressures -operate at minimum efficiency 56. An oil separator is a device used to remove oil from the -liquid refrigerant -receiver -gaseous refrigerant -expansion valve 53. The oil separator (trap) used in a shipboard refrigeration system is located between the -compressor discharge valve and the condenser -condenser and the receiver -receiver and the king valve -receiver and the expansion valve 54. Low compressor head pressure in a refrigeration system can be caused by -insufficient condenser cooling water -excessive condenser cooling water -air in the refrigeration system . The sensing line for the low pressure cutout switch to a refrigeration system is located -in the chill box -before the receiver -on the suction side of the compressor -on the discharge side of the compressor 57. Adjusting this valve to lower the superheat will result in a/an -evaporator pressure decrease -evaporator coil over-feed -evaporator capacity increase -expansion valve diaphragm rupture 60. When you adjust thermostatic expansion valve -refrigerant must be bled off the sensing line before adjustments are made -all refrigerant must be pumped into the receiver before adjustments are made -time must be allowed for conditions to stabilize in the evaporator before further adjustments are made -all refrigerant must be routed through the dehydrator while changing the superheat setting 59. The refrigeration system low pressure cutout switch is actuated by -an electric system manager -a sensing bulb at the tail coil of the evaporator -pressure changes in the suction line -failure of the king solenoid valve 58.The purpose of the refrigeration system low pressure cutout switch is to -protect the compressor from liquid flood back -protect the compressor from low discharge pressure -start and stop the compressor upon system demand -start the compressor after a drop in the evaporator pressure 55.52. this could be a result of -air or non-condensable gases in the system -leaking discharge valves -leaking suction valves -liquid refrigerant flooding back from the cooling coil 65. If the head pressure of a reciprocating refrigeration compressor is excessive. If a refrigeration compressor had developed a high suction pressure. One cause of high head pressure occurring in a refrigeration system can be -insufficient cooling water flow to the condenser -a low refrigerant charge in the system -the liquid valve is open too much -high evaporator superheat 63. the problem could be a result of -a minor accumulation of air or uncondensable gases in the system -a leaking king valve -a clogged subcooler -liquid refrigerant flooding back from the cooling coil 68. High suction pressure to a refrigeration system compressor is caused by -the expansion valve is insufficiently opened -the expansion valve being open too wide -the king valve is insufficiently open -a dirty dehydrator 67. -the relief valve should open before the high pressure cutout -the relief valve should open and allow the excess refrigerant to flow to the receiver -the high pressure cutout switch should operate before the relief valve opens -you should close in on a suction valve 64. Which of the conditions listed could cause excessively low refrigerant pressure at the compressor suction? -insufficient flow of condenser cooling water -the system is low on refrigerant -the solenoid valve to the chill box is "frozen" in the open position -the high pressure cutout switch is inoperative . If the refrigeration compressor was developing higher than normal discharge pressure. If the water failure switch should fail to shut down the refrigeration compressor. the refrigerant pressure will build up in the high pressure side of the system to the point where the -compressor discharge valves would be damaged -condenser tubes would rupture -system relief valve would open -high pressure cutout switch would function 66. Which of the problems listed would cause the discharge temperature of an R-12 refrigeration compressor to increase? -thermal expansion valve frozen open -suction gas heat exchanger bypassed -condenser clogged or fouled -high pressure cutout switch inoperative 62.-excessive refrigerant in the system 61. If a refrigeration compressor has developed a high head pressure as a result of a refrigerant overcharge. the condition would result in -continuous running of the compressor -high suction pressure -high discharge pressure -short cycling of the compressor on the water failure switch 76. A warmer than normal compressor suction line might be caused by -insufficient lubrication -insufficient refrigerant -excess refrigerant -excessive opening of the expansion valve 77. Leaking suction valves in a refrigeration compressor are indicated by -higher than normal suction pressure -lower than normal suction pressure -lower than normal evaporator temperature -noticeable increase in compressor noise 72. it may be necessary to -re-adjust the discharge pressure -clean the expansion valve screen -add refrigerant -adjust the expansion valve 74. To correct the condition of slugging and flooding back in a refrigeration system. Which of the conditions listed may be an indication of an excessive amount of refrigerant circulating through the system? -sweating of the compressor crankcase -colder than normal solenoid valve -frosting of the evaporator -weeping at the purge valve 71. Which of the conditions listed will cause a refrigeration compressor to run constantly without simultaneously decreasing the temperature in the refrigerated space? -shortage of refrigerant oil -slight shortage of refrigerant .69. Noise in a refrigeration compresoor can be caused by -worn bearings and piston pins -slugging due to flooding back -too much oil in circulation -all of the above 75. you should -increase the amount of cooling water to the condenser -decrease the amount of cooling water to the condenser -add more refrigerant to the system -remove some refrigerant from the system 70. If the discharge valves on the refrigeration compressor are leaking badly. the compressor should -run continuously -not start -have high discharge pressure -short cycle on the high pressure switch 73. If a refrigeration system were short of refrigerant. type water tube boiler with a secondary steam drum and super. An increase in the heat load to a refrigeration system will cause -the suction pressure to decrease -the suction temperature to increase -increased ice formation on the evaporator coil -excessive short cycling of the compressor 81. In a compression refrigeration cycle. Risers C.-excessive condenser cooling water flow -faulty expansion valve 78.5kw by this formula) 5) For good purification in purifier we set feed rate low or high? . A bilge pump fails to take suction if either (a) the suction line is holed (b) the bilge suction non-return valve is stuck open (c) the bilge pump is operating on low efficiency 82. All the above 3 other don remember 4) If 16 kw draw in 380 rpm how much kw it will draw if we reduce the rpm to 350?? P directly cube of rpm sayad (12.In a D. the steam is heated above the boiling point of water in the __________________ A . Secondary steam drum General New Qs(MARCH & APRIL):1) Perfect cooling means in air comp?? 2) How many hours we can work in threshold limit condition in some room??? 8 hrs a day or 40 hrs a week 3) Function of hunting gear a. the temperature of the liquid refrigerant experiences its greatest decrease in the -evaporator -compressor -expansion valve -condenser 80. Super.heater.heater D.Primary steam drum B. Frost appearing on the evaporator coils of a multi-box direct expansion refrigeration system -is best removed by means of ice pick -will increase the refrigeration effect -can be removed by passing hot vapors through the coils -can be quickly removed by simply shutting down the coils 79. (for pr testing) 8) Boiler feed water pp casing and impeller material?? ANS:.6) What sort of hardness due to mg. Power consumption increases 18) Which one is not a variable delivery pump?? Gear or screw 19) 20) Three methods of surface hardening of ferrous Welding of steel and aluminium?? TIG( tig used for dissimilar metals so most apt) 21) FD fan power 16 kw.75kw) 22) Sensible heat + latent heat…(total capacity) .(casing cast steel & impeller stainless steel) 9) Stearing gear 100% capability?? 10) Fan characteristic curves two questions 11) Good housekeeping?? 12) Vacuum testing of evaporator??? Abc 13) Two tube end joint. what will be new power?? ( by P pro to cube of rpm 6. Head n efficiency decreases b. rpm 800 if it is reduced to 600.(Permanent) 7) Gauging of safety v/v is done when?? ANS:. carbonates etc? ANS:.swaging??? 14) Hacksaw pitch?? 15) Cause of HP trip?? all the above is ans 16) Hot work not permit ----all of above 17) Specific gravity of centrifugal pump increases a. How to find RPM of a ?? ( this q has a fig . Lack of fusion d.30 teeth. Cargo control room d. Cogeneration c.80. Extraction b. Neither a & b 3) During welding is not followed in path of weld a.23) No of impeller helps to decide…single stage and multi stage 24) Prior to entry to LNG tank?? warming 25) Low carbon steel case hardening process?? 26) Relation bw cent pp Q & power relations?? 27) Free rotation of turbocharger??? 28) Slow and delay combustion effect on exh gas?? 29) Advancing of injection. Arc slag . Wheel house c. Both a & b d.D1=N2. distortion c. Lack of penetration b. use N1. All of the above 2) Power is generated by steam produced in boiler a. If gears a b c have 94. Effect on power and exh gas?? 30) The RPM of d is 600 and hobbed teeth 46.D2) New 1) Remote location to shut off ER FO p/ps ( multiple) a. ECR b. 4) Pivot point in ship turns when moving ahead a. Pearlite d. Ferrite c. Austenite b. d. Remove pulsations c.83% carbon steel is a. Aft of 1/3 to 1/6 of ships length from bow c. All the above 7) Air reservoir is not true for a. Both A & C 6) Fan velocity flow and characteristics depends on a. Velocity pr is used to calculate velocity flow c. B…. Collect air b. At amidship b. In expansion valve d. In compressor b. Velocity flow is along line of v d. Aft of 1/5 to 1/8 of ships length from bow 5) Refrigerated vapor pr changes in ref system in a. Static pr is a measure of potential energy b. Don remember 9) 1 kg of steam at 100 to form water at 100 . Increase pr of air 8) 0. In Evaporator c. Aft of 1/4to 1/6 of ships length from bow d. Efficiency falls c. Smoother c. Balancing wire d. Tougher . exterior bulkhead c. centerline bulkhead d. general plans b.(uscg 94) a. 12) A record of the types and strengths of steels used on a MODU must be included in the __________.. construction portfolio 13) A continuous watertight bulkhead on a MODU may also be a/an __________.(uscg 96) a. Stretching c. 560kcal 10) Increase in suction lift a. Swagging 15) The purpose of annealing any metal is to make the metal _______. All of the above 11) How to balance the impeller of multistage centrifugal p/p a. 540kcal b.( uscg 7) a. joiner bulkhead 14) Enlarging one tube end so the end of another tube of the same size will fit inside is termed __________. Certificate of Inspection d. Head falls b. ( uscg 9) a. Softer b. builder's documentation c. Having odd no of impeller b. Belling b. . structural bulkhead b. 580kcal c.a. Flaring d. Harder d. Discharge capacity falls d. 2260kcal d. Having even no of impeller c. fire can be extinguished by…. Inform CO to confirm the list /trim c. steam admitted to a cold pipe c. None 20) In variable delivery system how can maximum energy can be generated by which configuration a. draining a soot blower line before cracking the steam supply valve 18) a. Fixed fire installation c. prevent leakage past the floating end tube sheet b. filling the auxiliary boiler with hot water d. Pure static head b. Pure friction head c. filling the auxiliary boiler with cold water b. High static n low friction head d. Regularly check ullage and sounding b. Type A .(uscg 108) a. b.(mcq) a. Low static n high friction head 21) Internal FO transfer a. All the above 22) Which type of tank are fully pressurized and semi pressurized type a. Boundary cooling b. baffle cooling water so it can be directed on a multiple pass d. modify to a mixer type cooler 17) Water hammer in a steam heating system can be caused be____. Follow internal transfer checklist d.(uscg 167) a. Using water directly d.16) The floating end of a shell-and-tube type cooler utilizes a packing ring to __________. 19) who takes radial thrust in pumps volute casing partition of double volute casing roller bearing none In case of uptake fire . dissipate heat c. d. c. 95-100 25) The middle part of the liner will be facing less temp but top part is more tem but still we pass the jacket water from mid part also.b. Can’t do anything. All the above 24) In LO purifier what temp we should maintain a. For gravity disc to be fitted in purifier c. Don rem d. 65-70 b. b. To calculate amount b. keep the jacket temp proper and cyl LO TBN and flow appropriate. Type C d. 80-85 d. Start pump and put it in holding tank for separation c. 70-75 c. After doing A some corrosion will take place. Type D 23) Significance of knowing density of oil a. Do nothing 27) Pr range in cut in and cut out of refer… . Type B c. Start pump n move to waste oil tank and then hand scoop and clean tank using environment friendly cleaner d. Identification of oil d. Don rem 26) After oil spillage in ER what to do a. c. Start ows and pump out b. What will you do that midpoint not get corroded ( I think A) a. None of the above 30) What to use to reduce o2 in boiler a. Warming c. Both a n b d. b. Inerting 32) ME LO temp a. Chrome plated b. Both aux n main st gr to be power operated. Grey cast iron c. Press distribution b. Operating range 28) If liner is chrome plated then piston rings should be coated of ??? a. Purging b. Pearlite cast iron d. Sodium sulphite c. Only main d. 60 b. Plasma coated 29) If rudder stock dia is more than 230mm then a. Calcium sulphite 31) Before entering to empty LNG carrier for inspection what is primarily to be done a. Differential c. Hydrazine b. Only aux c. 75/100 .a. 65/70 c. Construction portfolio d. Collect water c. Vap pr b. Dia of impeller c. Don rem d. Collect salt deposit 34) Welding procedure of MODU is kept where?? a. Equalize water in generating tubes d. 36) Purpose of telemotor by pass valve a. Absolute pr c. Partial pr d.d. Certificate of inspection 35) Liquid pumping in lng depends on ( a or d) a. Partial vap pr. Vessel plan b. Collect steam b. Don remember 33) What is the function of steam drum a. Coast guard file c. Top up the hydraulic oil b. All . Equalize the two line d. As a relief valve c. All 37) Air comp performance depends on a. Vane angle b. dunnage….517 kW = 4.c. of impeller 14)lining .14 c) 3.how to balance impeller? Having more odd no. a)head falls b)n-efficiency falls c)disc capacity falls d)all of above 9)carburizing . of impeller and even no.cyaniding…………are heat treatment processes 10)PH=6 Acidic Near to neutral Neutral Alkaline 11)cylinder head relief valve lift a)fuel pressure b)fuel timing c)exhaust temp d)exhaust pressure 12)fan characteristic….nitriding..713 HP a)3000btu b) 50.disharge criteri a 12nm…25nm from land outside special areas…completely prohibited new reg 15)Alkaline salts in boiler a)chloride b)hydroxides n bi carbonates if .flow rate horizontal 13)multistage centrifugal pump.d 2)1 kg of steam at 100deg C to form water 100deg C a) 540 b) 580 c) 2260 d)560 3) 1 ton of refrig= 200 Btu/min = 3.517 kJ/s = 3.5kw 4)Max vaccum testing in evaporator a)pr test b)leak test c) drain test d)leak test in evp 8)Increase in suction lift ………….JAN & MARCH 2014 1)perfect cooling……. a)intercooler temp n after cooler temp same…reeds b)heat transfer of lub oil….static pressure vertical. single b)Fuel system…….c)sodium hydroxide(caustic soda) n ammonia n tri ammonium phosphate if p type hydroxides. Racing n jumping of propeller in bad weather a)Governor…. 0.if t type only bi carbonates 16)fan curve how to rotate in air a)vane tip b)tip angle c)tip or hub ratio d)All above 17)Empty tank how to use SCBA a)LEL% b)21% c)Benzene.mcq c)…...d)……… FEB 2014 22)COP is a function of A)condenser b)evaporator c)both a n b d)none of the above 23)sewage treatment plant procedure a)settling-aeration-chlorination-overboard b)aeration-settling-chlorination-overboard c)settling-chlorination-aeration-overboard . of oil b)Incorrect purge timing c)both a n b d) 21) over speed shutdown………fuel racks getting stuck and faulty governor.type of valve a)globe valve b)Gate valve c)SDNR d)butterfly 19)cylinder…chrome plate a)pearlite CI b)also chrome c)stellite 20)furnace backpressure a)Acc.01% less d)All above 18)Bilge pipe system.carbonates phosphates. petrol APRIL 2014 27)deflection of arc during welding is called a)Lack of fusion b)Distortion c)Lack of penetration d)Arc slag/blow 28)At which of the dew point temperature.d)….kerosene………ans.... air will have least moisture content a –10oC b –20oC c +30oC d –40oC 29)For sub zero applications the secondary coolant normally used is: a) Chilled water b) Brine c) Lithium Bromide d)Ammonia 30)Method of producing power by steam of boiler is called a)Co generation b)Extraction c)both a n b d)neither a nor b 31)boiler turn down ratio for y jet type oil burner(answer from Flanagan book) a)10:1 b)20:1 c)5:1 d)2:1 32) NPSHa definition (forgot options) 33)Minimum pressure testing for low pressure boiler . 26)volatility of petrol .d)chlorination-aeration-settling-overboard 24)identical fans are kept in series a)discharge pressure doubles b)static pressure doubles c)static pressure becomes four times d)discharge pressure is 4 times 25)rudder stock is moved 230mm and above then in steering gear a)one pump is used b)both pumps are used c)…. In ALCAP system.a)15 bar b)20 bar c)205bar d)None of the above 34) The discharge head of a centrifugal pump will vary directly with the A) Change in impeller diameter B) Square of the impeller diameter C)Cube of the impeller diameter D)Impeller efficiency for large changes in the size of the impeller 35) Pump power is directly proportional to the …………of pump impeller diameters A) No change B) Square C)Cube D)None of the above 36)0.83% carbon indicates A) Pearlite B) Cementite C)Ferrite D)None of the above 37)Air reservoir is not used for A) Collect air B) Remove pulsation from system C)…………. D)Increase pressure of air 38)The pressure of refrigerant in vapour compression system changes in a) b) c) d) Compressor Evaporation Expansion valve Both (a) & (c) 39)pivot point in ship turns when moving ahead A) At amidhips B) Aft of 1/3 to 1/6 of ships length from bow C) Aft of 1/4 to 1/6 of ships length from bow D) Aft of 1/5 to 1/8 of ships length from bow 40)Remote location to shut E/r fuel oil pumps A) Wheel house B) Engine room C)Cargo control room D)All of the above SET 2 from senoirs 1.Chemical tanker coating – epoxy . TLV – 8 HOURS / DAY OR 40 HOURS/WEEK 2. purpose of Transducer – 3.. phenolic . to collect steam 8. cold compressor suction side 9. injury . 35 USCG ques no 77 from motor pdf 18.. evap vlv or liguid stop vlv) 16. FW contaminate with oil 5.4. Expansion valve setting is too low then . before carry out any major in tank then aeration 17.to collect feed water . In halon system . to prevent water hammer .… 7. few more questions from USCG general pdf . static pump suction lift from USCG 15. purpose of compensating rings in air bottle 19. purpose of steam drum in 2 drum water tube boiler . tendency of water flashes into steam … 12. risk to pollution. Rupture disc is installed – to prevent over pressure of each cylinder… 11. Low velocity fog – cool & smother 10. water flow due to density difference b/ween steam & wtr 14. Refrigeration system valve location-.Thermal expansion.Boiler steam stop valve is eased off from its seat while starting from cold – \ 6.( i think expansion vlv. Moisture of Refrigent results in—corrosion jamming of expansion valve 13. Thermostatic steam trap – thermal expansion of fluid . In D type boiler.House keeping prevents – Fire.