6.1 1. Photo multiplier consists of Select one: a. 2 Photo emissive cathodes & 1 dynode b. 1 Photo emissive cathode & 1 dynode c. 1 Photo emissive cathode & 2 dynodes d. 2 Photo emissive cathodes & 2 dynodes 2. Photo conductive cell consists of a thin film of Select one: a. Barium titanate b. Lithium sulphate c. Quartz d. Selenium 3. _____________ is the example of photo emissive cell Select one: a. Photo transistor b. Photo diode c. Photo multiplier d. LDR 4. A photodiode can be used as ____ Select one: a. a photoconductive sensor b. a photovoltaic sensor c. both a and b https://en.wikipedia.org/wiki/Photodiode d. none of the above 5. The human visual system is specialized to detect Select one: a. all wavelengths of light b. infrared radiation c. electromagnetic radiation between 380 and 760 nm. d. ultraviolet radiation Photodetectors d. radiation intensity. but still offers response time in microseconds. With the increase in the intensity of light. Photovoltaic b. Select one: a. Photodiodes are often used for accurate measurement of light intensity in science and industry. Remains same d. Photometry c. Increases b. ______ is the science of the measurement of light. Photon b. Select one: a. Phototransistors d. Photons 5. Select one: a. Increases b. None of these 4. A photoconductive cell exhibits a resistance that _______ nonlinearly with dynamic variable. 6. It is not as fast as the photodiode. Select one: True False 3. Decreases c.2 1. Remains same d. Decreases c. the resistance of a photovoltaic cell Select one: a. in terms of its perceived brightness to the human eye. Photodiode Photodiode 2. Photometry c. None of these . Select one: a. pyrometer d. None 3. Broadband Pyrometers c. thermoelectric thermometer . platinum resistance thermometer c. Conductor processes d. Select one: True False 5. IR pyrometers Book Page No – 314 & 315 b. Select one: a. IR pyrometers are used in Select one: a. Radiation processes c. Narrowband Pyrometers d. In the optical pyrometer. Metal production facilities Book Page No – 314 & 315 b. Which of the following is most suitable for measuring very high temperatures ? Select one: a. the intensity of a heated platinum filament is varied until it matches an object whose temp. 6. of an object toward which they are pointed. Narrowband Pyrometers d.3 1. thermocouple b. These devices are not easily adapted to control processes because they require acute optical comparisons. usually by a human operator. is to be determined. _____ read the temp. Broadband Pyrometers c. IR pyrometers b. None 4. Temperature control processes 2. IR pyrometers b. A standard lamp is a/an Select one: a. Optical pyrometers involve wavelengths only in the visible part of the spectrum. Select one: True False 5. Select one: a. 18.4mW c.4 W b. Total Radiation Pyrometer c. 14 mW d.4 1. None of the above . None 3. IR pyrometers b. For Metal Production facilities ____ are used Select one: a. Fluorescence source d. 18. How many watts of power are emitted by a 1 cd source? Select one: a. Atomic Source c. Incandescent Source b. both a and b d. _____ responds to visible and IR radiation with little regard to wavelength. 14 W 2. 6. Total Radiation Pyrometer c. both a and b d. None of the above 4. Select one: a. In a control system the output of the controller is given to Select one: a. Controller. Control valve c. In digital control system. Servomotor b. Amplifier 4. Select one: True False 2. Controller 3.1 1. _____ is the intermediate element which process the signal from ____ and input to the final control element. Control Valve . Actuator b. ______ is not a final control element Select one: a. Sensed signal 5. 7. Actuator. Potentiometer From Internet d. Actuator. Controller. Comparator d. sensor c. Desired variable value c. Error signal d. output from controller converts to digital signal with the help of DAC. Which of the following is not the input to a controller? Select one: a. Actuator signal B/C The Actuator fixed in the output side of the controller b. Final control element b. Electro-pneumatic converter c. control valve d. 2 1. 3 to 15 mA c. relay c.004 to 0.org/Discuss/Question/in_pneumatic_control_systems_the_control_valve_used_as_fi nal_control_element_converts_-11225085. Control action b. 4 to 20 A 3. two position control Its Have Two position On & Off (Like Position. None . Select one: a. Both a and b d. Standard signal from electrical cureent is Select one: a. In _____. Reverse Action d. pressure signal to electric signal c.02 A d. half position control b. Special ICs within the final control element allow the digital signal to be connected directly. one position control d. A pneumatic amplifier is also called _____ . four position control 4. 3 to 15 A b. position change to pressure signal d. Select one: a. electric signal to pressure signal b. On-off Control is also called as ________. Direct Action 2. Select one: a. DAC c. In pneumatic control systems the control valve used as final control element converts Select one: a. pressure signal to position change http://studysite. 0. a booster b.0 & Position – 1) c.htm 5. 7. To convert electrical input to rotation b. To convert electrical to mechanical signal d. Actuator b. Both a and b d. Controller 2. or vapor-flow rate control. 7. Control valve c. hydraulic actuators c. This device is designed for use in process-control applications involving liquid. To convert electrical or mechanical signal to displacement 4.381 d.3 1. None of the above . Pneumatic actuators b. The different types of control valves are classified by a relationship between Select one: a. Both a and b BookPage No . None 3. gas. ______ is/are often used in process control because they allow very large forces to be produced from modest pressure systems Select one: a. Solenoid is used ____ Select one: a. To convert electrical signal to mechanical motion c. the flow rate through the valve c. A pneumatic actuator converts a pressure signal to a shaft extension according to Select one: 5. Final Control element d. Select one: a. the valve stem position b. 05 c.2 5. Shunt field b. but good speed-control characteristics produced by varying armature excitation current.4 1. 0. This motor has a smaller starting torque. Both a and b d. For linear control valve.05 m3/s per kPa1/2. What is flow rate in m3/s.1 b.25 d. 0. between the valve stem position and size of the valve c. 0. between the valve stem position and the flow rate through the valve 3. The pressure difference is 4 KPa in the pipe of diameter 5 cm. 0. Series Field c. AC motors Book Page No – 362 & 363 c. None 2. relationship used is ______ Select one: 4. None d. The constriction constant is 0. Select one: a. Stepper motors . between the flow position and the flow rate through the valve d. The different types of control valves are classified by a relationship Select one: a. between the flow rate position and the valve b. DC motors b. 7. What form of electric motor is most widely used in high-power applications? Select one: a. Select one: a.
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