[PRODUCTION ENGINEERINGSECTION - 1] SuDHiR Chauhan 1. Segmental chips are formed during machining A. mild steel B. cast iron C. high speed steel D. high carbon steel Cemented carbide tool tips are produced by powder metallurgy. A. True B. False If the diameter of the hole is subject to considerable variation, then for locating in jigs and fixtures, the pressure type of locator used is A. conical locator B. cylindrical locator C. diamond pin locator D. vee locator Side rake angle of a single point cutting tool is the angle A. by which the face of the tool is inclined towards back B. by which the face of the tool is inclined sideways C. between the surface of the flank immediately below the point and a plane at right angles to the centre line of the point of the tool D. between the surface of the flank immediately below the point and a line drawn from the point perpendicular to the base Internal gears can be made by A. hobbing B. shaping with pinion cutter C. shaping with rack cutter D. milling In order to prevent tool from rubbing the work __________ on tools are provided. A. rake angles B. relief angles The silicon carbide abrasive is chiefly used for grinding A. cemented carbide B. ceramic C. cast iron D. all of these Drilling is an example of A. orthogonal cutting B. oblique cutting C. simple cutting D. uniform cutting A round nose tool may be fed eitner from left to right end or from right to left end of the lathe bed. A. Yes B.No When the cutting edge of the tool is dull, then during machining A. continuous chips are formed B. discontinuous chips are formed C. continuous chips with built-up edge are formed D. no chips are formed A fine grained grinding wheel is used to grind hard materials. A. Correct B. Incorrect Cast iron during machining produces A. continuous chips B. discontinuous chips C. continuous chips with built-up-edge 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. [PRODUCTION ENGINEERING SECTION - 1] SuDHiR Chauhan 13. D. none of these A single point thread cutting tool should ideally have A. zero rake angle B. positive rake angle C. negative rake angle D. point angle The work or surface speed for cylindrical grinding varies from A. 5 to 10 m/min B. 10 to 20 m/min C. 20 to 30 m/min D. 40 to 60 m/min The cutting tool in a milling machine is mounted on A. spindle B. arbor C. column D. knee The tool made of cemented carbide wear out faster at A. slow speeds B. medium speeds C. fast speeds D. very fast speeds A push broach as compared to pull broach A. has less number of teeth B. is short and stocky C. removes less material for each pass of the tool D. all of the above Twist drills are made of A. high speed steel B. carbon steel C. stainless steel D. either (a) or (b) A twist drill is a A. side cutting tool B. front cutting tool C. end cutting tool D. none of these The rake angle required to machine brass by high speed steel tool is A. 0° B. 10° C. 20° D. -10° The lip angle of a single point tool is usually A. 20° to 40° B. 40° to 60° C. 60° to 80° D. none of these The average cutting speed for turning brass with a high speed steel tool is A. 15 to 19 m/min B. 25 to 31 m/min C. 60 to 90 m/min D. 90 to 120 m/min The maximum production of small and slender parts is done by A. watch maker's lathe B. sliding head stock automatic lathe C. multispindle automatic lathe D. capastan lathe 14. 15. 16. 17. 18. 19. 20. 21. 22. 23. 24. Side rake angle on tools is provided to control chip flow. A. True B. False [PRODUCTION ENGINEERING SECTION - 1] SuDHiR Chauhan 25. The method of grinding used to produce a straight or tapered surface on a workpiece, is A. internal cylindrical grinding B. form grinding C. external cylindrical grinding D. surface grinding A fixture does not guide the tool. A. Correct B. Incorrect Crater wear occurs mainly on the A. nose part, front relief face and side relief face of the cutting tool B. face of the cutting tool at a short distance from the cutting edge only C. cutting edge only D. front face only Gear lapping is an operation A. after heat treatment B. prior to heat treatment C. for gear reconditioning D. none of these The facing is an operation of A. bevelling the extreme end of a workpiece B. embossing a diamond shaped pattern on the surface of a workpiece C. reducing the diameter of a workpiece over a very narrow surface D. machining the ends of a workpiece to produce a flat surface square with the axis A fixture is defined as a device which A. holds and locates a workpiece and guides and controls one or more cutting tools B. holds and locates a workpiece during an inspection or for a manufacturing operation C. is used to check the accuracy of workpiece D. all of the above A drill considered as a cutting tool having zero rake, is known as a A. flat drill B. straight fluted drill C. parallel shank twist drill D. tapered shank twist drill Which of the following statement is wrong about ultra-sonic machining? A. It is best suited for machining hard and brittle materials. B. It cuts materials at very slow speeds. C. It removes large amount of material. D. It produces good surface finish. In oblique cutting system, the maximum chip thickness occurs at the middle. A. Correct B. Incorrect Larger end cutting edge angle __________ tool life. A. increases B. decreases C. does not effect The lead screw of a lathe has __________ threads. A. single start B. double start C. multi-start D. any one of these 26. 27. 28. 29. 30. 31. 32. 33. 34. 35. 36. A left hand tool on a lathe cuts most efficiently when it travels A. from left to right end of the lathe bed B. from right to left end of the lathe bed [PRODUCTION ENGINEERING SECTION - 1] SuDHiR Chauhan C. D. 37. with the help of a compound slide across the bed The correct sequence of tool materials in increasing order of their ability to retain their hot hardness is A. carbide, ceramic, cermet, borazon B. ceramic, carbide, borazon, cermet C. cermet, carbide, ceramic, borazon D. borazon, ceramic, carbide, cermet Which of the following statement is incorrect with reference of lathe cutting tools? A. The flank of the tool is the surface or surfaces below and adjacent to the cutting edges B. The nose is the corner, arc or chamfer joining the side cutting and the end cutting edges C. The heel is that part of the tool which is shaped to produce the cutting edges and face D. The base is that surface of the shank which bears against the support and takes tangent pressure of the cut In the relation VTn = C, the value of n for carbide tools is A. 0.1 to 0.2 B. 0.20 to 0.25 C. 0.25 to 0.40 D. 0.40 to 0.55 In up milling, the thickness of chip is A. minimum at the beginning of the cut and maximum at the end of the cut B. maximum at the beginning of the cut and minimum at the end of the cut C. uniform throughout the cut D. none of these The machining of titanium is difficult due to A. high thermal conductivity of titanium B. chemical reaction between tool and work C. low tool-chip contact area D. none of these In orthogonal cutting system, the maximum chip thickness occurs at the middle. A. Correct B. Incorrect Lapping is an operation of A. making a cone-shaped enlargement of the end of a hole B. smoothing and squaring the surface around a hole C. sizing and finishing a small diameter hole D. producing a hole by removing metal along the circumference of a hollow cutting tool The different spindle speeds on a lathe form A. arithmetical progression B. geometrical progression C. harmonical progression D. any one of these If the helix angle of the drill is made __________ 30°, then the torque required to drive the drill at a given feed will be more. A. equal to B. less than C. more than The angle included between the two lips projected upon a plane parallel to the drill axis and paralled to the two cutting lips, is called helix angle. A. Correct B. Incorrect 38. 39. 40. 41. 42. 43. 44. 45. 46. 47. In hot machining, tool is made of A. tungsten carbide B. brass or copper C. diamond D. stainless steel In ultra-sonic machining, the metal is removed by 48. [PRODUCTION ENGINEERING SECTION - 1] SuDHiR Chauhan A. B. C. D. 49. using abrasive slurry between the tool and work direct contact of tool with the work maintaining an electrolyte between the work and tool in a very small gap between the two erosion caused by rapidly recurring spark discharges between the tool and work The velocity of tool relative to the workpiece is known as cutting velocity. A. True B. False Grinding wheels should be tested for balance A. only at the time of manufacture B. before starting the grinding operation C. at the end of grinding operation D. occasionally 50. 1. The example of snag grinding is A. trimming the surface left by sprues and risers on castings B. grinding the parting line left on castings C. removing flash on forgings D. all of these The angle between the shear plane and __________ is called shear angle. A. work surface B. tool face In machining soft materials, a tool with negative relief angle is used. A. Correct B.Incorrect Which of the following parameters influence the axial feed rate in centreless grinding? A. Regulating wheel diameter B. Speed of the regulating wheel C. Angle between the axes of grinding and regulating wheels D. all of the above The lathe spindles are usually made hollow and provided with A. internal taper B. external taper C. internal and external taper D. no taper The top and sides of the table of a shaper usually have A. L-type slots B. T-type slots C. I-type slots D. any one of these The binding material used in cemented carbide tools is A. tungsten B. chromium C. silicon D. cobalt In machining metals, chips break due to __________ of work material. A. toughness B. ductility C. elasticity D. work hardening 2. 3. 4. 5. 6. 7. 8. 9. For softer materials, the point angle of the drill is kept [PRODUCTION ENGINEERING SECTION - 1] SuDHiR Chauhan A. B. C. D. 10. equal to 118° less than 118° more than 118° any one of these When the backgear is engaged in a backgeared headstock, the spindle speed reduces considerably. A. Agree B. Disagree In continuous chip cutting, the maximum heat is taken by the cutting tool. A. Yes B. No Which of the following statement is correct regarding grinding of high carbon steel? A. Grinding at high speed results in the reduction of chip thickness and cutting forces per grit. B. Aluminium oxide wheels are employed. C. The grinding wheel has to be of open structure. D. all of the above The rear teeth of a broach A. perform burnishing operation B. remove minimum metal C. remove maximum metal D. remove no metal High speed steel drills can be operated at about __________ the speed of high carbon steel drills. A. one-half B. one-fourth C. double D. four times When the end of a tap is tapered for about three or four threads, it is known as a A. taper tap B. bottoming tap C. second tap D. none of these Crater wear is predominant in A. carbon tool steels B. tungsten carbide tools C. high speed steel tools D. ceramic tools The method of centreless grinding used to produce taper is A. infeed grinding B. through feed grinding C. endfeed grinding D. any one of these In a shaper, the length of stroke is increased by A. increasing the centre distance of bull gear and crank pin B. decreasing the centre distance of bull gear and crank pin C. increasing the length of the arm D. decreasing the length of the slot in the slotted lever Carbon tool steels have low-heat and wear-resistance. A. Correct B. Incorrect 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. Trepanning is an operation of A. making a cone-shaped enlargement of the end of a hole [PRODUCTION ENGINEERING SECTION - 1] SuDHiR Chauhan B. C. D. 21. smoothing and squaring the surface around a hole sizing and finishing a small diameter hole producing a hole by removing metal along the circumference of a hollow cutting tool The abrasive recommended for grinding materials of high tensile strength is A. silicon carbide B. aluminium oxide C. sand stone D. diamond The factor responsible for the formation of continuous chips with built up edge is A. low cutting speed and large rake angle B. low cutting speed and small rake angle C. high cutting speed and large rake angle D. high cutting speed and small rake angle An important geometrical quantity in the cutting of metals which can be used as a criterion for machinability of metals is A. cutting speed B. feed rate C. shear angle D. tool geometry In centreless grinding, the surface speed of regulating wheel is A. 5 to 15 m/min B. 15 to 60 m/min C. 60 to 90 m/min D. 90 to 120 m/min In metal cutting, use of low feeds and high cutting speeds is desired when the objective is A. high metal removal rate B. dry machining C. use of soft cutting tool D. surface finish The angle on which the strength of the tool depends is A. rake angle B. cutting angle C. clearance angle D. lip angle Larger than 15° side cutting edge angle A. increases tool life B. decreases tool life C. produces chipping and decreases tool life D. results in excessive stress concentration and greater heat generation 22. 23. 24. 25. 26. 27. 28. Which of the following statement is correct for orthogonal cutting system? A. The cutting edge of the tool is perpendicular to the direction of tool travel. B. The cutting edge clears the width of the workpiece on either ends. C. The chip flows over the tool face and the direction of the chip flow velocity is normal to the cutting edge. D. all of the above The angle made by the face of the tool and the plane parallel to the base of cutting tool is called A. rake angle B. cutting angle C. clearance angle 29. [PRODUCTION ENGINEERING SECTION - 1] SuDHiR Chauhan D. 30. lip angle In case of turning, as the machining proceeds, the spindle speed must __________ with the decrease in diameter of work. A. decrease B. increase Back rake angle of a single point tool is the angle by which the face of the tool is inclined towards back. A. Agree B. Disagree As the cutting speed increases, tool life decreases. A. Yes B. No In metal machining, the work-tool contact zone is a zone where heat is generated due to A. plastic deformation of metal B. burnishing friction C. friction between the moving chip and the tool face D. none of the above Thread grinding requires work speed from A. 1 to 3 m/min B. 5 to 10 m/min C. 10 to 14 m/min D. 14 to 20 m/min 31. 32. 33. 34. 35. Threading is an operation of A. smoothing and squaring the surface around a hole B. sizing and finishing a small diameter hole C. producing a hole by removing metal along the circumference of a hollow cutting tool D. cutting helical grooves on the external cylindrical surface Glazing in grinding wheels can be decreased by A. using a harder wheel or by increasing the wheel speed B. using a softer wheel or by decreasing the wheel speed C. using a harder wheel or by decreasing the wheel speed D. using a softer wheel or by increasing the wheel speed The cutting speed is minimum while machining __________ with a high speed steel tool. A. cast iron B. mild steel C. brass D. aluminium A process of removing metal by pushing or pulling a cutting tool is called A. up milling B. down milling C. forming D. broaching The hardness of a grinding wheel is specified by A. Brinell hardness number B. Rockwel! hardness number C. Vickers pyramid number D. letter of alphabet Which of the following operations can be performed with milling cutters? A. cutting key ways on shafts B. cutting external screw threads C. cutting teeth of spur gears 36. 37. 38. 39. 40. [PRODUCTION ENGINEERING SECTION - 1] SuDHiR Chauhan D. 41. all of these While cutting helical gears on a non-differential gear hobber, the feed change gear ratio is A. independent of index change gear ratio B. dependent on speed change gear ratio C. inter-related to index change gear ratio D. independent of speed and index change gear ratio 42. The swing diameter over the bed is __________ the height of the centre measured from the bed of the lathe. A. equal to B. twice C. thrice D. one-half In grinding irregular, curved, tapered, convex and concave surfaces, the grinder used is A. cylindrical grinder B. internal grinder C. surface grinder D. tool and cutter grinder Down milling is also called A. conventional milling B. climb milling C. end milling D. face milling Any number of equal divisions can be obtained on milling machine by A. direct indexing B. simple indexing C. compound indexing D. differential indexing 43. 44. 45. 46. The depth of cut in drilling is __________ the drill diameter. A. equal to B. one-fourth C. one-half D. double The type of tool used on lathe, shaper and planer is A. single point cutting tool B. two point cutting tool C. three point cutting tool D. multi-point cutting tool A __________ grinding wheel is used to grind soft materials. A. coarse grained B. medium grained C. finegrained 47. 48. 49. The relation between tool life (T) and cutting speed (V) is VTn = Constant. In this relation, the value of n depends upon A. work material B. tool material C. working conditions [PRODUCTION ENGINEERING SECTION - 1] SuDHiR Chauhan D. 50. type of chip produced In order to grind soft material A. coarse grained grinding wheel is used B. fine grained grinding wheel is used C. medium grained grinding wheel is used D. any one of these 1. In centreless grinders, the maximum angular adjustment of the regulating wheel is A. 5° B. 10° C. 15° D. 20° The type of reamer used for reaming operation in a blind hole, is A. straight fluted reamer B. left hand spiral fluted reamer C. right hand spiral fluted reamer D. any one of these In a single point tool, the angle between the surface of the flank immediately below the point and a line drawn from the point perpendicular to the base, is known as A. side relief angle B. end relief angle C. back rake angle D. side rake angle A set of eight form relieved milling cutters for each module is provided to enable cutting of gears of different A. materials B. types of gears C. number of teeth D. width of gears Crater wear is usually found while machining brittle materials. A. Correct B. Incorrect The grinding operaion is a A. shaping operation B. forming operation C. surface finishing operation D. dressing operation The guideways are of A. flat type B. V-type C. dovetail type D. any one of these The snag grinding is done A. to produce good surface finish and high degree of accuracy B. to remove considerable amount of metal without regard to accuracy of the finished surface C. to grind exterior cylindrical surfaces D. any one of the above The velocity of tool along the tool face is known as A. shear velocity B. chip velocity C. cutting velocity D. mean velocity The purpose of jigs and fixtures is to A. increase machining accuracy B. facilitate interchangeability 2. 3. 4. 5. 6. 7. 8. 9. 10. [PRODUCTION ENGINEERING SECTION - 1] SuDHiR Chauhan C. D. 11. decrease expenditure on quality control all of these In hot machining, solid carbide tools are preferred over high speed steel tools. A. True B. False The trade name of a non-ferrous cast alloy composed of cobalt, chromium and tungsten is called A. ceramic B. stellite C. diamond D. cemented carbide In which of the following milling machine, the table can be tilted in a vertical plane by providing a swivel arrangement at the knee? A. Universal milling machine B. Plain milling machine C. Universal milling machine D. Hand milling machine A coarse grained grinding wheel is used to grind A. hard and brittle materials B. soft and ductile materials C. hard and ductile materials D. soft and brittle materials The abrasive slurry used in ultra-sonic machining contains fine particles of A. aluminium oxide B. boron carbide C. silicon carbide D. any one of these High speed steel cutting tools operate at cutting speeds __________ than carbon steel tools. A. 2 to 3 times lower B. 2 to 3 times higher C. 5 to 8 times higher D. 8 to 20 times higher The factor which affects the tool life is A. tool geometry B. cutting speed C. feed rate D. all of these In lapping operaion, the amount of metal removed is A. 0.005 to 0.01 mm B. 0.01 to 0.1 mm C. 0.05 to 0.1 mm D. 0.5 to 1 mm The cutting force in up milling __________ per tooth movement of the cutter. A. is zero B. is maximum C. decreases from maximum to zero D. increases from zero to maximum The height of each tooth of a broach is A. same throughout B. in progressively decreasing order C. in progressively increasing order D. none of these A right hand tool on a lathe cuts most efficiently when it travels A. from left to right end of the lathe bed B. from right to left end of the lathe bed C. with the help of a compound slide D. across the bed 12. 13. 14. 15. 16. 17. 18. 19. 20. 21. [PRODUCTION ENGINEERING SECTION - 1] SuDHiR Chauhan 22. The surface finish is improved by the increase in A. cutting speed B. nose radius C. true rake angle D. all of these The cutting speed for drilling copper with high speed steel drills varies from A. 10 to 20 m/min B. 18 to 30 m/min C. 24 to 45 m/min D. 60 to 90 m/min A dense structure of a grinding wheel is denoted by the number 9 to 15 or higher. A. Yes B. No High speed steel tools retain their hardness upto a temperature of A. 250°C B. 350°C C. 500°C D. 900°C A taper tap has A. its end tapered for about three or four threads B. its end tapered for about eight or ten threads C. full threads for the whole of its length D. none of the above For machining a mild steel workpiece using carbide tool, the maximum material will be removed at a temperature of A. 50°C B. 100°C C. 175°C D. 275°C Which of the following statement is wrong? A. The diamond is the hardest tool material and can run at cutting speeds about 50 times that of high speed steel tool. B. The ceramic tools can be used at cutting speeds 40 times that of high speed steel tools. C. The cemented carbide tools can be used at cutting speeds 10 times that of high speed steel tools. D. The ceramic tools can withstand temperature upto 600°C only. Climb milling is chosen while machining because A. the chip thickness increase gradually B. it enables the cutter to dig in and start the cut C. the specific power consumption is reduced D. better surface finish can be obtained The material which on machining produces chips with built up edge is A. brittle material B. tough material C. hard material D. ductile material In down milling, the thickness of chip is A. minimum at the beginning of the cut and maximum at the end of the cut B. maximum at the beginning of the cut and minimum at the end of the cut C. uniform throughout the cut D. none of these The chuck used for setting up of heavy and irregular shaped work should be A. four jaw independent chuck B. three jaw universal chuck C. magnetic chuck D. drill chuck Which of the following operations is carried out at a minimum cutting velocity if the machines are equally rigid and the tool work materials are the same? A. Turning B. Grinding C. Boring D. Milling 23. 24. 25. 26. 27. 28. 29. 30. 31. 32. 33. [PRODUCTION ENGINEERING SECTION - 1] SuDHiR Chauhan 34. Ceramic tools are fixed to tool body by A. soldering B. brazing C. welding D. clamping The soft grade grinding wheels are denoted by the letters A. A to H B. I to P C. Q to Z D. A to P The helix angle of a drill is __________ for drilling brass. A. equal to 30° B. less than 30° C. more than 30° In continuous chip cutting, the maximum heat __________ the velocity of cutting. A. depends upon B. does not depend upon In a universal milling machine, the table can be swiveled horizontally and can be fed at an angle to the milling machine spindle. A. True B. False The size of a shaper is given by A. stroke length B. motor power C. mass of machine D. rate size The tool life, in case of continuous cutting, is much better than intermittent cutting. A. Agree B. Disagree The main purpose of a boring operation, as compared to drilling, is to A. drill a hole B. finish the drilled hole C. correct the hole D. enlarge the existing hole Carbide tipped tools usually have A. negative rake angle B. positive rake angle C. any rake angle D. no rake angle Gear burnishing is a process for A. surface finishing B. under-cut gears C. cycloidal gears D. removing residual stresses from teeth roots The continuous chips are in the form of long coils having the same thickness throughout. A. Agree B. Disagree The saw milling is an operation of A. producing grooves around the periphery of a cylindrical or conical workpiece B. producing narrow slots or grooves on a workpiece C. reproduction of an outline of a template on a workpiece D. machining several surfaces of a workpiece simultaneously The high cutting speed and large rake angle of the tool will result in the formation of A. continuous chips B. discontinuous chip C. continuous chips with built up edge D. none of these Cutting fluid has no effect on the tool life. A. True B. False 35. 36. 37. 38. 39. 40. 41. 42. 43. 44. 45. 46. 47. [PRODUCTION ENGINEERING SECTION - 1] SuDHiR Chauhan 48. The chisel edge angle of a drill is usually 120° to 135°. A. Correct B. Incorrect The cutting speed of a drill varies from point to point on the cutting edge of the drill. A. Correct B. Incorrect In oblique cutting system, the maximum chip thickness A. occurs at the middle B. may not occur at the middle C. depends upon the material of the tool D. depends upon the geometry of the tool 49. 50. 1. Dielectric is used in A. electro-chemical machining B. ultra-sonic machining C. electro-discharge machining D. laser machining The type of reamer used for reaming soft aluminium or copper, is A. straight fluted reamer B. left hand spiral fluted reamer C. right hand spiral fluted reamer D. any one of these The tool material, for faster machining, should have A. wear resistance B. red hardness C. toughness D. all of these The helix angle of a drill is more than 30° for drilling aluminium. A. Agree B. Disagree In a single point turning operation with a cemented carbide and steel combination having a Taylor exponent of 0.25, if the cutting speed is halved, then tool life will become A. half B. two times C. eight times D. sixteen times An open structure of a grinding wheel is used for A. soft materials B. tough materials C. ductile materials D. all of these A twist drill is specified by its A. shank, material and diameter B. shank, lip angle and size of flute C. material, length of body and helix angle D. any one of these The hole to be drilled for tapping is __________ the outside diameter of the thread on the tap. A. equal to B. smaller than C. greater than Glazing in grinding wheels takes place when the A. wheel is too hard or wheel revolves at a very high speed B. wheel is too soft or wheel revolves at a very slow speed C. wheel is too hard and wheel revolves at very slow speed D. wheel is too soft and wheel revolves at a very high speed 2. 3. 4. 5. 6. 7. 8. 9. [PRODUCTION ENGINEERING SECTION - 1] SuDHiR Chauhan 10. Low helix angle drills are preferred for drilling holes in A. plastics B. copper C. cast steel D. carbon steel In which of the following machine, the work remains stationary and the tool is rotated? A. Vertical boring machine B. Horizontal boring machine C. Precision boring machine D. Jig boring machine The ratio between two consecutive spindle speeds for a six-speed drilling machine using drills of diameter 6.25 to 25 mm size and at a cutting velocity of 18 m/min is A. 1.02 B. 1.32 C. 1.66 D. 1.82 The cutting speed of a drill depends upon the A. material of drill B. type of material to be drilled C. quality of surface finish desired D. all of these The part of the tool on which cutting edge is formed is called nose. A. Correct B. Incorrect The chamfering is an essential operation after A. knurling B. rough turning C. boring D. thread cutting The broaching operation in which either the work or the tool moves across the other, is known as A. pull broaching B. push broaching C. surface broaching D. continuous broaching Ultra-sonic machining is best suited for A. tool steels B. sintered carbides C. glass D. all of these In plunge grinding A. the work is reciprocated as the wheel feeds to produce cylinders longer than the width of wheel face B. the work rotates in a fixed position as the wheel feeds to produce cylinders equal to or shorter than the width of wheel face C. the work is reciprocated as the wheel feeds to produce cylinders shorter than the width of wheel face D. the work rotates in a fixed position as the wheel feeds to produce cylinders longer than the width of wheel face When the grinding wheel is marked by the letters from I to P, it indicates that the grinding wheel is of hard grade. A. True B. False A 15 mm drilling machine means that it can drill a hole A. maximum diameter 15 mm B. in 15 mm thick plates C. having cross-sectional area of 15 mm2 D. none of these The tap used to cut threads in a blind hole is A. taper tap B. second tap C. bottoming tap D. any one of these 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21. [PRODUCTION ENGINEERING SECTION - 1] SuDHiR Chauhan 22. A jig is defined as a device which A. holds and locates a workpiece and guides and controls one or more cutting tools B. holds and locates a workpiece during an inspection or for a manufacturing operation C. is used to check the accuracy of workpiece D. all of the above A mandrel is used to hold A. an eccentric work B. a heavy work C. a thin work D. none of these 23. 24. Jigs are used A. for holding and guiding the tool in drilling, reaming or tapping operations B. for holding the work in milling, grinding, planing or turning operations C. to check the accuracy of workpiece D. none of the above The swing diameter over carriage is always less than the swing diameter over bed. A. Yes B. No The size of abrasive grain required in a grinding wheel depends upon the A. amount of material to be removed B. hardness of material being ground C. finish desired D. all of these A grinding wheel is said to be of __________ if it holds the abrasive grains more securely. A. soft grade B. medium grade C. hard grade A dense structure of a grinding wheel is used for A. hard materials B. brittle materials C. fnishing cuts D. all of these The keyways, grooves and slots cannot be cut on a shaper. A. True B. False Side relief angle of a single point tool is the angle A. by which the face of the tool is inclined towards back B. by which the face of the tool is inclined sideways C. between the surface of the flank immediately below the point and a plane at right angles to the centre line of the point of tool D. between the surface of the flank immediately below the point and a line drawn from the point perpendicular to the base Gears can be best produced on mass production by A. shaping B. casting C. forming D. hobbing In a plain milling machine, the table can be moved A. longitudinally B. crosswise C. vertically D. all of these In drilling operation, the metal is removed by A. shearing B. extrusion C. shearing and extrusion D. shearing and compression 25. 26. 27. 28. 29. 30. 31. 32. 33. [PRODUCTION ENGINEERING SECTION - 1] SuDHiR Chauhan 34. A single point tool has A. rake angle B. cutting angle C. lip angle D. all of these In hot machining, the work is heated by A. simple heating B. flame heating C. induction heating D. any one of these 35. 36. The type of tool used on milling machine and broaching machine is A. single point cutting tool B. two point cutting tool C. three point cutting tool D. multi-point cutting tool Which of the following statement is correct for oblique cutting system? A. The cutting edge is inclined at an angle less than 90° with the normal to the velocity of the tool. B. Frequently, more than one cutting edges are in action. C. The chip flows on the tool face at an angle less than 90° with the normal on the cutting edge. D. all of the above When the tool moves parallel to the lathe axis, the movement is termed as A. cross feed B. angular feed C. longitudinal feed D. any one of these In the relation VTn = C, the value of n for ceramic tools is A. 0.1 to 0.2 B. 0.20 to 0.25 C. 0.25 to 0.40 D. 0.40 to 0.55 Chip breakers are used to A. increase tool life B. remove chips from bed C. break the chips into short segments D. to minimise heat generation The factor responsible for the formation of discontinuous chips is A. low cutting speed and large rake angle B. low cutting speed and small rake angle C. high cutting speed and large rake angle D. high cutting speed and small rake angle The stroke of a shaping machine is 250 mm. It makes 30 double strokes per minute. The overall average speed of operation is A. 3.75 m/min B. 5 m/min C. 7.5 m/min D. 15 m/min The actual feed in centreless grinders is given by (where d = Dia. of regulating wheel, n = Revolutions per minute, and α = Angle of inclination of wheel) A. πd B. πd n C. πd n sin α D. πd n cos α For fast removal of materials during grinding, a __________ grinding wheel is used. 37. 38. 39. 40. 41. 42. 43. 44. [PRODUCTION ENGINEERING SECTION - 1] SuDHiR Chauhan A. B. C. 45. coarse grained fine grained medium grained Which of the following process is used for preparing parts having large curved surfaces and thin sections? A. Hot machining B. Ultra-sonic machining C. ECM process D. Chemical milling A grinding wheel becomes glazed (i.e. cutting edge takes a glass-like appearance) due to A. wear of bond B. breaking of abrasive grains C. wear of abrasive grains D. cracks on grinding wheel To grind brittle materials, a coarse grained grinding wheel is used. A. Agree B. Disagree Gears can be cut on a shaper. A. Agree B. Disagree The grade of grinding wheel depends upon A. hardness of the material being ground B. speed of wheel and work C. condition of grinding machine D. all of these A dynamometer is a device used for the measurement of A. chip thickness ratio B. forces during metal cutting C. wear of the cutting tool D. deflection of the cutting tool 46. 47. 48. 49. 50. 1. A broach has A. roughing teeth B. semi-finishing teeth C. finishing teeth D. all of these A round nose tool has no back rake and side rake. A. Correct B. Incorrect In electro-discharge machining, tool is made of A. brass B. copper C. copper tungsten alloy D. all of these The cutting speed is maximum while machining __________ with a high speed steel tool. A. cast iron B. mild steel C. brass D. aluminium The obtuse angle, included between the chisel edge and the lip as viewed from the end of a drill, is called A. helix or rake angle B. point angle 2. 3. 4. 5. [PRODUCTION ENGINEERING SECTION - 1] SuDHiR Chauhan C. D. 6. chisel edge angle lip clearance angle The plain milling machine is more rigid and heavier in construction than a universal milling machine of the same size. A. Correct B. Incorrect An operation of embossing a diamond shaped pattern on the surface of a workpiece, is known as A. counter-boring B. grooving C. knurling D. facing An operation of enlarging the end of a hole cylindrically is known as grooving. A. Correct B. Incorrect Which of the following statement is wrong? A. The larger side rake angle produces chipping. B. The smaller rake angle produces excessive wear and deformation in tool. C. The side cutting edge angle (less than 15°) increases tool life. D. The increase in nose radius decreases tool life. It is desired to perform the operations like drilling, reaming, counter-boring etc. on a work piece. Which of the following machine will be used? A. Sensitive drilling machine B. Radial drilling machine C. Gang drilling machine D. Multiple spindle drilling machine The lathe centres are provided with standard taper known as A. Morse taper B. Seller's taper C. Chapman taper D. Brown and Sharpe taper In a plain milling cutter, the portion of the gash adjacent to the cutting edge on which the chip impinges is called A. face B. fillet C. land D. lead The grooving is an operation of A. bevelling the extreme end of a workpiece B. embossing a diamond shaped pattern on the surface of a workpiece C. reducing the diameter of a workpiece over a very narrow surface D. enlarging the end of a hole cylindrically Cutting fluids are used to A. cool the tool B. improve surface finish C. cool the workpiece D. all of these The structure of a grinding wheel depends upon A. hardness of the material being ground B. nature of the grinding operation C. finish required D. all of these In a plain milling cutter, the chip space between the back of one tooth and the face of the next tooth is called A. face B. fillet C. gash D. land 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. [PRODUCTION ENGINEERING SECTION - 1] SuDHiR Chauhan 17. In which of the following machine, the work rotates and the tool is stationary? A. Vertical boring machine B. Horizontal boring machine C. Precision boring machine D. Jig boring machine The cutting fluid mostly used for machining alloy steels is A. water B. soluble oil C. dry D. sulphurised mineral oil The cutting speed is zero at the periphery and it is maximum at the centre of the drill. A. Yes B. No In metal cutting operations, chips are formed due to plastic deformation of the metal. A. Agree B. Disagree Tool life is generally better when A. grain size of the metal is large B. grain size of the metal is small C. hard constituents are present in the microstructure of the tool material D. none of the above When the metal is removed by erosion caused by rapidly recurring spark discharges between the tool and work, the process is known as A. electro-chemical machining B. electro-discharge machining C. ultra-sonic machining D. none of these 18. 19. 20. 21. 22. 23. Cemented carbide tools are generally poor in shear. A. Yes B. No Which of the following statement is wrong as regard to down milling? A. It can not be used on old machines due to backlash between the feed screw of the table and the nut. B. The chips are disposed off easily and do not interfere with the cutting. C. The surface milled appears to be slightly wavy. D. The coolant can be poured directly at the cutting zone where the cutting force is maximum. In reaming process A. metal removal rate is high B. high surface finish is obtained C. high form accuracy is obtained D. high dimensional accuracy is obtained The lathe spindles at the nose end have A. internal screw threads B. external screw threads C. no threads D. tapered threads The lip clearance angle is the angle formed by the A. leading edge of the land with a plane having the axis of the drill B. flank and a plane at right angles to the drill axis C. chisel edge and the lip as viewed from the end of a drill 24. 25. 26. 27. [PRODUCTION ENGINEERING SECTION - 1] SuDHiR Chauhan D. 28. none of the above Flank wear occurs mainly on the A. nose part, front relief face and side relief face of the cutting tool B. face of the cutting tool at a short distance from the cutting edge C. cutting edge only D. front face only The process of changing the shape of grinding wheel as it becomes worn due to breaking away of the abrasive and bond, is called A. truing B. dressing C. facing D. clearing The infeed grinding is similar to plunge grinding. A. Yes B. No The cutting angle of a flat drill varies from A. 3° to 8° B. 20° to 30° C. 60° to 90° D. 90° to 120° In electro-discharge machining, dielectric is used to A. help in the movement of the sparks B. control the spark discharges C. act as coolant D. all of these In metal cutting operations, the shear angle is the angle made by the shear plane with the A. direction of the tool axis B. direction of tool travel C. perpendicular to the direction of the tool axis D. central plane of the workpiece The floating position of the holding fixture in a rotary transfer device is used to A. improve the accuracy of location B. reduce the tendency to over-index C. improve upon the acceleration and deceleration characteristics D. reduce the cycle time The operation of smoothing and squaring the surface around a hole is known as A. counter-sinking B. counter-boring C. trepanning D. spot facing The cutting force in down milling is maximum when the tooth begins its cut and reduces to minimum when the tooth leaves the work. A. Correct B. Incorrect The ductile materials, during machining, produce A. continuous chips B. discontinuous chips C. continuous chips with built up edge D. either (a) or (c) Slow speed of the spindle is necessary in A. thread cutting 29. 30. 31. 32. 33. 34. 35. 36. 37. 38. [PRODUCTION ENGINEERING SECTION - 1] SuDHiR Chauhan B. C. D. 39. turning a work of larger diameter turning a hard or tough material all of these The hole drilled for tapping should be smaller than the tap size by twice the depth of thread. A. Agree B. Disagree Relief angles on high speed steel tools usually vary from A. 0° to 3° B. 3° to 10° C. 10° to 20° D. 20° to 30° Discontinuous chips are formed during machining of A. brittle metals B. ductile metals C. hard metals D. soft metals A drill mainly used in drilling brass, copper or softer materials, is A. flat drill B. straight fluted drill C. parallel shank twist drill D. tapered shank twist drill In a planer A. tool is stationary and work reciprocates B. work is stationary and tool reciprocates C. tool moves over stationary work D. tool moves over reciprocating work 40. 41. 42. 43. 44. Which of the following operation is first performed? A. Spot facing B. Boring C. Tapping D. Drilling The size of a lathe is specified by the A. length between centres B. swing diameter over the bed C. swing diameter over the carriage D. all of these If the cutting speed is increased, then the built-up-edge A. becomes longer B. may or may not form C. becomes smaller and finally does not form at all D. has nothing to do with speed For machining a mild steel workpiece by a high speed steel tool, the average cutting speed is A. 5 m/min B. 10 m/min C. 15 m/min D. 30 m/min 45. 46. 47. [PRODUCTION ENGINEERING SECTION - 1] SuDHiR Chauhan 48. Tool signature consists of __________ elements. A. two B. four C. five D. seven The negative rake is usually provided on A. high carbon steel tools B. high speed steel tools C. cemented carbide tools D. all of these The tool life is affected by A. depth of cut B. cutting speed C. feed D. all of these 49. 50. 1. Up milling is also called conventional milling. A. Agree B. Disagree Fixtures are used A. for holding and guiding the tool in drilling, reaming or tapping operations B. for holding the work in milling, grinding, planing or turning operations C. to check the accuracy of workpiece D. none of the above In ultra-sonic machining, tool is made of A. tungsten carbide B. brass or copper C. diamond D. stainless steel Ceramic tools has greater tool life than carbide tools. A. True B. False The rake angle of a single point cutting tool corresponds to __________ of a twist drill. A. lip clearance angle B. helix angle C. point angle D. chisel edge angle A tool used to withdraw a drill from the sleeve is called A. drill remover B. drill puller C. drift D. drill drawer The cutting fluid mostly used for machining steel is A. water B. soluble oil C. dry D. heavy oils The lip angle is the angle A. between the tool face and the ground end surface of flank B. made by the face of the tool and the plane parallel to the base of the cutting tool C. between the face of the tool and a line tangent to the machined surface at the cutting point D. none of the above Small nose radius 2. 3. 4. 5. 6. 7. 8. 9. [PRODUCTION ENGINEERING SECTION - 1] SuDHiR Chauhan A. B. C. D. 10. increases tool life decreases tool life produces chipping and decreases tool life results in excessive stress concentration and greater heat generation The operation of producing grooves around the periphery of a cylindrical or conical workpiece is called A. profile milling B. gang milling C. saw milling D. helical milling As the cutting speed increases, the tool cutting forces A. remain constant B. increases C. decreases D. first increases and then decreases Crater wear leads to A. increase in cutting temperature B. weakening of tool C. friction and cutting forces D. all of these The addition of lead, sulphur and phosphorus to low carbon steels, help to A. reduce built up edge B. break up chips C. improve machinability D. all of these The relation between the tool life (T) in minutes and cutting speed (V) in m/min is (where n = An exponent, which depends upon the tool and workpiece, and C = A constant) A. VnT = C B. VTn = C C. Vn/T = C D. V/Tn = C The width of cutting edge of a parting-off tool varies from A. 3 to 12 mm B. 5 to 20 mm C. 8 to 30 mm D. 15 to 40 mm The grinding of long, slender shafts or bars is usually done by A. infeed grinding B. through feed grinding C. endfeed grinding D. any one of these In centreless grinding, work place centre will be A. above the line joining the two wheel centres B. below the line joining the two wheel centres C. on the line joining the two wheel centres D. at the intersection of the line joining the wheel centres with the work place plane Tool life is measured by the A. number of pieces machined between tool sharpenings B. time the tool is in contact with the job C. volume of material removed between tool sharpenings D. all of the above Soft materials can not be economically ground due to A. high temperature involved B. frequent wheel clogging C. rapid wheel wear D. low work piece stiffness The process of removing metal by a cutter which is rotated in the same direction of travel of workpiece, is called 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. [PRODUCTION ENGINEERING SECTION - 1] SuDHiR Chauhan A. B. C. D. 21. up milling down milling face milling end milling It is required to cut screw threads of 2 mm pitch on a lathe. The lead screw has a pitch of 6 mm. If the spindle speed is 60 r.p.m., then the speed of lead screw will be A. 10 r.p.m. B. 20 r.p.m. C. 120 r.p.m. D. 180 r.p.m. The tool life in case of a grinding wheel is the time A. between two successive regrinds of the wheel B. taken for the wheel to be balanced C. taken between two successive wheel dressings D. taken for a wear of 1 mm on its diameter In which of the following machine, the work is usually rotated while the drill is fed into work? A. Sensitive drilling machine B. Radial drilling machine C. Gang drilling machine D. Deep hole drilling machine In twist fluted drills, chips do not move out automatically. A. Correct B. Incorrect Mild steel during machining produces __________ chips. A. continuous B. discontinuous Crater wear is mainly due to the phenomenon known as A. adhesion of metals B. oxidation of metals C. diffusion of metals D. all of these The cutting speed for drilling aluminium, brass and bronze with high speed steel drills varies from A. 10 to 20 m/min B. 18 to 30 m/min C. 24 to 45 m/min D. 60 to 90 m/min Flank wear depends upon the A. hardness of the work and tool material at the operating temperature B. amount and distribution of hard constituents in the work material C. degree of strain hardening in the chip D. all of these The tool may fail due to A. cracking at the cutting edge due to thermal stresses B. chipping of the cutting edge C. plastic deformation of the cutting edge D. all of these The operation of machining several surfaces of a workpiece simultaneously is called A. profile milling B. gang milling C. saw milling D. helical milling The grinding wheel speed (surface speed in m/min) usually varies from A. 500 to 1000 B. 1000 to 1500 C. 1500 to 2000 D. 2000 to 2500 22. 23. 24. 25. 26. 27. 28. 29. 30. 31. [PRODUCTION ENGINEERING SECTION - 1] SuDHiR Chauhan 32. The factor considered for evaluation of machinability is A. cutting forces and power consumption B. tool life C. type of chips and shear angle D. all of these In oblique cutting system, the tool may or may not generate a surface parallel to the workface. A. Yes B. No The plunge grinding requires very __________ speed. A. high B. low In conventional milling, the cutting force tends to lift the work. A. True B. False In machining metal, cutting force at the cutting edge is measured by a A. wattmeter B. dynamometer C. hydrometer D. pyrometer With the same tool life, the maximum material per minute is removed by A. increasing the cutting speed B. decreasing the cutting speed C. increasing the depth of cut D. increasing the feed rate The process of removing metal by a cutter which is rotated against the direction of travel of workpiece, is called A. up milling B. down milling C. face milling D. end milling A feed gear box for a screw cutting lathe is designed on the basis of A. geometric progression B. arithmetic progression C. harmonic progression D. none of these In American Standard Association (A S A) system, if the tool nomenclature is 8-6-5-5-10-15-2 mm, then the side rake angle will be A. 5° B. 6° C. 8° D. 10° The abrasive recommended for grinding materials of low tensile strength is A. silicon carbide B. aluminium oxide C. sand stone D. diamond The chamfering is an operation of A. bevelling the extreme end of a workpiece B. embossing a diamond shaped pattern on the surface of a workpiece C. reducing the diameter of a workpiece over a very narrow surface D. enlarging the end of a hole cylindrically The hard grade grinding wheels are denoted by the letters A. A to H B. I to P C. Q to Z D. A to P The tailstock set over required to turn a taper on the entire length of a workpiece having diameters D and d is A. D-d/2L B. D-d/L C. D-d/2 D. D-d 33. 34. 35. 36. 37. 38. 39. 40. 41. 42. 43. 44. [PRODUCTION ENGINEERING SECTION - 1] SuDHiR Chauhan 45. The angle formed by the leading edge of the land with a plane having the axis of the drill, is called A. helix or rake angle B. point angle C. chisel edge angle D. lip clearance angle The lip clearance angle should decrease towards the centre of the drill than at the circumference. A. Yes B. No If the shear angle is large and the chip-tool contact area is low, then the tool life will be more. A. Correct B. Incorrect In drilling brass, a drill with A. zero helix angle is used B. low helix angle is used C. high helix angle is used D. any helix angle can be used The carbide tools operating at very low cutting speeds (below 30 m/min) A. reduces tool life B. increases tool life C. have no effect on tool life D. spoils the work piece 46. 47. 48. 49. 50. In oblique cutting of metals, the cutting edge of the tool is A. perpendicular to the workpiece B. perpendicular to the direction of tool travel C. parallel to the direction of tool travel D. inclined at an angle less than 90° to the direction of tool travel 1. A drill bit of 20 mm diameter rotating at 500 r.p.m. with a feed rate of 0.2 mm/revolution is used to drill a through-hole in a mild steel plate 20 mm thickness. The depth of cut in this drilling operation is A. 0.2 mm B. 10 mm C. 20 mm D. 100 mm The tail stock and the carriage of a lathe may be guided on same or different guideway. A. True B. False In order to achieve a specific surface finish in single point turning, the most important factor to be controlled is A. depth of cut B. cutting speed C. feed D. tool rake angle Surface grinding is done to produce A. tapered surface B. flat surface C. internal cylindrical holes D. all of these Gear finishing operation is called A. shaping B. milling C. hobbing D. burnishing 2. 3. 4. 5. [PRODUCTION ENGINEERING SECTION - 1] SuDHiR Chauhan 6. The tool life is said to be over if A. poor surface finish is obtained B. there is sudden increase in cutting forces and power consumption C. overheating and fuming due to heat of friction starts D. all of the above Continuous chips with built up edge are formed during machining of A. brittle metals B. ductile metals C. hard metals D. soft metals The rate of removing metal is __________ by increasing the depth of cut. A. decreased B. increased The method of grinding used to produce internal cylindrical holes and tapers, is A. internal cylindrical grinding B. form grinding C. external cylindrical grinding D. surface grinding The tool life is __________ cutting speed. A. independent of B. dependant upon For machining a cast iron workpiece by a high speed steel tool, the average cutting speed is A. 10 m/min B. 15 m/min C. 22 m/min D. 30 m/min The vector sum of cutting velocity and chip velocity is __________ shear velocity. A. equal to B. less than C. more than For harder alloy steel, the point angle of the drill is kept A. equal to 118° B. less than 118° C. more than 118° D. any one of these An open structure of a grinding wheel is denoted by the number 1 to 8. A. Correct B. Incorrect In an orthogonal cutting, the depth of cut is halved and the feed rate is double. If the chip thickness ratio is unaffected with the changed cutting conditions, the actual chip thickness will be A. doubled B. halved C. quadrupled D. unchanged For turning small taper on long workpiece, the suitable method is A. by a form tool B. by setting over the tail stock C. by a taper turning attachment D. by swivelling the compound rest In a milling operation, two side milling cutters are mounted with a desired distance between them so that both sides of a workpiece can be milled simultaneously. This set up is called 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. [PRODUCTION ENGINEERING SECTION - 1] SuDHiR Chauhan A. B. C. D. 18. gang milling straddle milling string milling side milling The time (in minutes) for a drilling a hole is given by t=Depth of hole+h/FeedxR.P.M where h is the A. length of the drill B. drill diameter C. flute length of the drill D. cone height of the drill Crack in grinding wheel is developed due to A. high temperature developed at the contact of the wheel face and work B. grinding hard work C. low speed of wheel D. high speed of wheel The average cutting speed for turning mild steel with a high speed steel tool is A. 15 to 19 m/min B. 25 to 31 m/min C. 60 to 90 m/min D. 90 to 120 m/min In a shaper, the metal is removed during A. forward stroke B. return stroke C. both the forward and return strokes D. neither the forward nor the return stroke 19. 20. 21. 22. The aluminium oxide abrasive is chiefly used for grinding A. high speed steel B. carbon steel C. wrought iron D. all of these In __________ operation, the chip thickness is minimum at the beginning of the cut and it reaches to the maximum when the cut terminates. A. conventional milling B. climb milling C. face milling D. end milling In __________ operation, the cutting force is maximum when the tooth begins its cut and reduces it to minimum when the tooth leaves the work. A. up milling B. down milling C. face milling D. end milling The taper on the lathe spindle is A. 1 in 10 B. 1 in 15 C. 1 in 20 D. 1 in 30 Which of the following statement is correct in regard to centreless grinding? 23. 24. 25. 26. [PRODUCTION ENGINEERING SECTION - 1] SuDHiR Chauhan A. B. C. D. 27. The workpiece is supported throughout its entire length as grinding takes place. It is a continuous process and adopted for production work. It requires no holding device for the work. all of the above The specific cutting energy used for establishing the machinability of the metal depends upon its A. coefficient of friction B. microstructure C. work hardening characteristics D. all of these The form grinding is used to grind gear teeth, threads, splined shafts and holes. A. Correct B. Incorrect Which of the following parameters govern the value of shear angle in continuous chip formation? A. True feed B. Chip thickness C. Rake angle of the cutting tool D. all of these The relief or clearance at the cutting edge of a flat drill varies from A. 3° to 8° B. 20° to 30° C. 60° to 90° D. 90° to 120° In drilling bakellite and fibrous plastics, the point angle of a drill is A. 90° B. 118° C. 135° D. 150° 28. 29. 30. 31. 32. The shear velocity is the velocity of A. tool relative to the workpiece B. chip relative to the tool C. tool along the tool face D. none of these In centreless grinders, the regulating wheel is inclined at A. 0° to 8° B. 9° to 15° C. 16° to 20° D. 21° to 25° A grinding wheel is said to be of __________ if the abrasive grains can be easily dislodged. A. soft grade B. medium grade C. hard grade In drilling softer materials, the cutting speed is __________ as compared to harder materials. A. same B. low C. high Which of the following statement is correct about hot machining? A. It requires less power than machining metals at room temperature. B. The rate of tool wear is lower. C. It is used for machining high strength and high temperature resistant materials. D. all of the above 33. 34. 35. 36. [PRODUCTION ENGINEERING SECTION - 1] SuDHiR Chauhan 37. For turning internal tapers, the suitable method is A. by a form tool B. by setting over the tail stock C. by a taper turning attachment D. by swivelling the compound rest Lathe bed is made of A. mild steel B. alloy steel C. pig iron D. chilled cast iron In metal machining, the zone where the maximum heat is generated due to the plastic deformation of metal, is called A. friction zone B. work-tool contact zone C. shear zone D. none of these The operation of making a cone-shaped enlargement of the end of a hole is known as A. counter-sinking B. counter-boring C. trepanning D. spot facing Internal or external threads of different pitches can be produced by A. pantograph milling machine B. profiling machine C. planetary milling machine D. piano-miller 38. 39. 40. 41. 42. In a shaper A. tool is stationary and work reciprocates B. work is stationary and tool reciprocates C. tool moves over stationary work D. tool moves over reciprocating work Which of the following statement is correct about EDM machining? A. It can machine hardest materials. B. It produces high degree of surface finish. C. The tool and work are never in contact with each other. D. all of these Spot facing is an operation of smoothing and squaring the surface around a hole. A. True B. False A better machinable metal is one which gives A. lower chip-tool contact area and larger shear angle B. higher chip-tool contact area and smaller shear angle C. lower chip-tool contact area and smaller shear angle D. higher chip-tool contact area and larger shear angle The angle between the lathe centres is A. 30° B. 45° C. 60° D. 90° 43. 44. 45. 46. [PRODUCTION ENGINEERING SECTION - 1] SuDHiR Chauhan 47. When the shear angle is large A. path of shear is short and chip is thin B. path of shear is large and chip is thick C. path of shear is short and chip is thick D. path of shear is large and chip is thin The correct sequence of the following parameters in order of their maximum to minimum influence on tool life is A. feed rate, depth of cut, cutting speed B. depth of cut, cutting speed, feed rate C. cutting speed, feed rate, depth of cut D. feed rate, cutting speed, depth of cut In drilling aluminium, a drill with A. zero helix angle is used B. low helix angle is used C. high helix angle is used D. any helix angle can be used Ceramic cutting tools are A. made by cold pressing of aluminium oxide powder B. available in the form of tips C. brittle and have low bending strength D. all of these 48. 49. 50. 1. The angle between the face and flank of the single point cutting tool is known as A. rake angle B. clearance angle C. lip angle D. point angle In order to obtain a surface finish in the range of 0.75 μm to 1.25 μm , the operation used is called. A. grinding B. lapping C. honing D. buffing Which of the following statement is correct as regard to up milling? A. It cannot be used on old machines due to backlash between the feed screw of the table and the nut. B. The chips are disposed off easily and do not interfere with the cutting. C. The surface milled appears to be slightly wavy. D. The coolant can be poured directly at the cutting zone where the cutting force is maximum. In determining the various forces on the chip, Merchant assumed that the A. cutting edge of the tool is sharp and it does not make any flank contact with the workpiece B. only continuous chip without built-up-edge is produced C. cutting velocity remains constant D. all of the above Stellite preserve hardness upto a temperature of A. 350°C B. 500°C C. 900°C D. 1100°C Hard and tough materials like cast iron should be turned at A. slow speed B. high speed C. any speed 2. 3. 4. 5. 6. [PRODUCTION ENGINEERING SECTION - 1] SuDHiR Chauhan D. 7. certain specific speed In oblique cutting system, the cutting edge of the tool A. may clear the width of the workpiece B. may or may not clear the width of the workpiece C. may not clear the width of the workpiece D. should always clear the width of the workpiece When the shear angle is small A. path of shear is short and chip is thin B. path of shear is large and chip is thick C. path of shear is short and chip is thick D. path of shear is large and chip is thin A fine grained grinding wheel is used to grind A. hard and brittle materials B. soft and ductile materials C. hard and ductile materials D. soft and brittle materials EDM machining is applied for A. shaping carbide dies and punches having complicated profiles B. making large number of small holes in sieves and fuel nozzles C. embossing and engraving on harder materials D. all of these In gear hobbing A. only hob rotates B. only gear blank rotates C. both hob and gear blank rotates D. neither hob nor gear blank rotates Holes are machined by push broaches only for sizing. A. Correct B. Incorrect The increase in depth of cut and feed rate __________ surface finish. A. improves B. deteriorates C. does not effect A lathe with four steps on the cone pulley and with backgears will have A. four direct speeds B. four indirect speeds C. four direct and four indirect speeds D. eight indirect speeds The parameter which completely defines the chip formation in a metal cutting process is A. shear angle B. chip-tool contact length C. both (a) and (b) D. none of these In machining cast iron, no cutting fluid is required. A. Correct B. Incorrect In machining metals, surface roughness is due to A. feed marks or ridges left by the cutting tool B. fragment of built-up edge on the machined surface 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. [PRODUCTION ENGINEERING SECTION - 1] SuDHiR Chauhan C. D. 18. cutting tool vibrations all of these A diamond locating pin is used in jigs and fixtures because A. diamond is very hard and wear resistant B. it occupies very little space C. it helps in assembly with tolerance on centre distance D. it has a long life In metal machining, the zone where the heat is generated due to friction between the moving chip and the tool face, is called A. friction zone B. work-tool contact zone C. shear zone D. none of these The drill spindles are provided with standard taper known as A. Morse taper B. Seller's taper C. Chapman taper D. Brown and Sharpe taper The operation performed on a shaper is A. machining horizontal surface B. machining vertical surface C. machining angular surface D. all of these Chemical milling operation is performed A. on universal milling machine B. on plain milling machine C. in a tank containing an etching solution D. any one of these The thrust force will increase with the increase in A. side cutting edge angle B. tool nose radius C. rake angle D. end cutting edge angle The broaching operation in which the work moves past the stationary tool is called A. pull broaching B. push broaching C. surface broaching D. continuous broaching In transverse grinding A. the work is reciprocated as the wheel feeds to produce cylinders longer than the width of wheel face B. the work rotates in a fixed position as the wheel feeds to produce cylinders equal to or shorter than the width of wheel face C. the work is reciprocated as the wheel feeds to produce cylinders shorter than the width of wheel face D. the work rotates in a fixed position as the wheel feeds to produce cylinders longer than the width of wheel face If the grain size is __________ the tool life is better. A. smaller B. larger Flank wear is due to the abrasive action of hard mis-constituents including debris from built up edge as the work material rubs the work surface. 19. 20. 21. 22. 23. 24. 25. 26. 27. [PRODUCTION ENGINEERING SECTION - 1] SuDHiR Chauhan A. Correct 28. B. Incorrect The operation of reproduction of an outline of a template on a workpiece is called face milling. A. Yes B. No The usual value of the point angle of a drill is A. 70° B. 100° C. 118° D. 130° Buffing wheels are made of A. softer metals B. cotton fabric C. carbon D. graphite Jigs are heavier than fixtures in construction. A. Yes B.No In electro-chemical machining, the gap between the tool and work is kept as A. 0.1 mm B. 0.25 mm C. 0.4 mm D. 0.75 mm The process of improving the cutting action of the grinding wheel is called A. truing B. dressing C. facing D. clearing The cutting speed for drilling aluminium, brass and bronze with carbon steel drills is __________ cutting speed for drilling mild steel with high speed steel drills. A. equal to B. less than C. more than In electro-discharge machining, the tool is connected to cathode. A. Correct B. Incorrect Broaching is applied for machining A. internal and external surfaces B. round or irregular shaped holes C. external flat and contoured surfaces D. all of these Half nut is used to lock the lathe carriage to the lead screw for thread cutting. A. True B. False The advantage of a broaching operation is that A. rate of production is very high B. high accuracy and high class of surface finish is possible C. roughing and finishing cuts are completed in one pass of the tool D. all of the above The tool life __________ as the cutting speed increases. A. decreases B. increases The infeed grinding is used to A. produce tapers B. grind shoulders and formed surfaces 29. 30. 31. 32. 33. 34. 35. 36. 37. 38. 39. 40. [PRODUCTION ENGINEERING SECTION - 1] SuDHiR Chauhan C. D. 41. grind long, slender shafts or bars ail of these The enlarging of an existing circular hole with a rotating single point tool is called A. boring B. drilling C. reaming D. internal turning In the relation VTn = C, the value of n for high speed steel tools varies from 0.25 to 0.40. A. Agree B. Disagree Glazing in grinding wheels __________ cutting capacity. A. has no effect on B. increase C. decrease The usual value of the helix angle of a drill is A. 20° B. 30° C. 45° D. 60° The cutting speed for counter-boring should be __________ that of drilling operation. A. equal to B. less than C. greater than In drilling mild steel and brass, the point angle of a drill is 118°. A. True B. False The tail stock set over method of taper turning is preferred for A. internal tapers B. small tapers C. long slender tapers D. steep tapers The chuck preferred for quick setting and accurate centering of a job is A. four jaw independent chuck B. collect chuck C. three jaw universal chuck D. magnetic chuck Negative rakes are used for A. carbide tools B. heavy loads C. harder materials D. all of these A bottoming tap has A. its end tapered for about three or four threads B. its end tapered for about eight or ten threads C. full threads for the whole of its length D. none of the above The effect of setting a boring tool above centre height leads to A. increase in the effective rake angle and a decrease in the effective clearance angle B. increase in both effective rake angle and effective clearance angle C. decrease in the effective rake angle and an increase in the effective clearance angle D. decrease in both effective rake angle and effective clearance angle 42. 43. 44. 45. 46. 47. 48. 49. 50. 51. [PRODUCTION ENGINEERING SECTION - 1] SuDHiR Chauhan 52. Which of the following statement is correct about nose radius? A. It improves tool life B. It improves the surface finish C. both (a) and (b) D. none of these The cutting speed for drilling __________ with high speed steel drills is 24 to 45 m/min. A. mild steel B. copper C. aluminium D. brass In a centre lathe, the cutting tool is fed in __________ with reference to the lathe axis. A. cross direction only B. longitudinal direction only C. both cross and longitudinal direction D. any direction The angle between the face of the tool and a line tangent to the machined surface at the cutting point is called cutting angle. A. Correct B. Incorrect The dressing and truing of grinding wheel are done with the same tools but not for the same purpose. A. Agree B. Disagree The point angle of a drill, for drilling stainless steel, is A. 90° B. 118° C. 135° D. 150° A numerical method of identification of tool is known as tool signature. A. Correct B. Incorrect Tumbler gears in lathe are used to A. reduce the spindle speed B. cut gears C. give desired direction of movement to the lathe carriage D. drill a workpiece 53. 54. 55. 56. 57. 58. 59.
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