MCQOPTIONS
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MCQOPTIONS
This section includes 32 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Measurements knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Thermister is used to measure ____________ |
| A. | temperature |
| B. | pressure |
| C. | height |
| D. | displacement |
| Answer» B. pressure | |
| 2. |
Cesium-silver oxide cells are sensitive to the near infrared wavelengths. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 3. |
Which of the following is a photoemissive cell? |
| A. | photomultiplier tubes |
| B. | barrier layer cell |
| C. | galvanic cell |
| D. | rochell-salt cell |
| Answer» B. barrier layer cell | |
| 4. |
The instruments which give a direct reading of the temperature at the thermistor position are known as _________ |
| A. | thermistor |
| B. | telethermometers |
| C. | rtd |
| D. | tempothermometer |
| Answer» C. rtd | |
| 5. |
Photovoltaic cells need an external electrical supply to function. |
| A. | True |
| B. | False |
| Answer» C. | |
| 6. |
Photo-diodes work in _________ |
| A. | forward biased |
| B. | reverse biased |
| C. | independent of forward and reverse biasing |
| D. | any configuration |
| Answer» C. independent of forward and reverse biasing | |
| 7. |
Which of the following material is used to build photovoltaic cells? |
| A. | selenium |
| B. | celenuim |
| C. | silicon |
| D. | iron |
| Answer» B. celenuim | |
| 8. |
What is the principle behind photoelectric transducers? |
| A. | conversion of wind energy to electrical energy |
| B. | conversion of light energy to electrical energy |
| C. | conversion of mechanical energy to electrical energy |
| D. | conversion of electrical energy to light energy |
| Answer» C. conversion of mechanical energy to electrical energy | |
| 9. |
Reverse leakage current in a transistor _______ |
| A. | is affected by light |
| B. | is not affected by light |
| C. | increases with a decrease in pressure |
| D. | decreases with increase in temperature |
| Answer» B. is not affected by light | |
| 10. |
Response time for gas-filled phototubes is _______ |
| A. | zero |
| B. | intermediate |
| C. | fast |
| D. | slow |
| Answer» E. | |
| 11. |
Optocoupler consists of a phototransistor and a led. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 12. |
When an open circuited pn junction is illuminated then _________________ |
| A. | resistance increases |
| B. | there is no effect |
| C. | electron hole pairs are formed |
| D. | capacitance increases |
| Answer» D. capacitance increases | |
| 13. |
Photoconductive transducers produce output ________ |
| A. | due to change in inductance |
| B. | due to change in light |
| C. | due to change in resistance |
| D. | due to change in temperature |
| Answer» D. due to change in temperature | |
| 14. |
CESIUM-SILVER_OXIDE_CELLS_ARE_SENSITIVE_TO_THE_NEAR_INFRARED_WAVELENGTHS.?$ |
| A. | True |
| B. | False |
| Answer» B. False | |
| 15. |
RESPONSE_TIME_FOR_GAS-FILLED_PHOTOTUBES_IS________?$ |
| A. | zero |
| B. | intermediate |
| C. | fast |
| D. | slow |
| Answer» E. | |
| 16. |
Thermister_is_used_to_measure_____________$ |
| A. | temperature |
| B. | pressure |
| C. | height |
| D. | displacement |
| Answer» B. pressure | |
| 17. |
Reverse_leakage_current_in_a_transistor________$ |
| A. | is affected by light |
| B. | is not affected by light |
| C. | increases with decrease in pressure |
| D. | decreases with increase in temperature |
| Answer» B. is not affected by light | |
| 18. |
Which of the following is a photoemissive cell ? |
| A. | photomultiplier tubes |
| B. | barrier layer cell |
| C. | galvanic cell |
| D. | rochell-salt cell |
| Answer» B. barrier layer cell | |
| 19. |
Optocoupler consists of a phototransistor and a led? |
| A. | True |
| B. | False |
| Answer» B. False | |
| 20. |
The instruments which give direct reading of the temperature at the thermistor position are known as _________ |
| A. | thermistor |
| B. | telethermometers |
| C. | rtd |
| D. | tempothermometer |
| Answer» C. rtd | |
| 21. |
When an open circuited pn junction is illuminated |
| A. | resistance increases |
| B. | there is no effect |
| C. | electron hole pairs are formed |
| D. | capacitance increases |
| Answer» D. capacitance increases | |
| 22. |
Photovoltaic cells need external electrical supply to function? |
| A. | True |
| B. | False |
| Answer» C. | |
| 23. |
Photoconductors are made of _______ |
| A. | thick layer of semiconductor |
| B. | thin layer of semiconductor |
| C. | capacitive substrate |
| D. | inductive substrate |
| Answer» C. capacitive substrate | |
| 24. |
Photo-diodes work in ____ |
| A. | forward biased |
| B. | reverse biased |
| C. | independent of forward and reverse biasing |
| D. | any configuration |
| Answer» C. independent of forward and reverse biasing | |
| 25. |
Phototubes are very quick in response to light. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 26. |
Which of the following is not a photoemissive cell? |
| A. | high vacuum photocells |
| B. | barrier layer cell |
| C. | gas-filled photocell |
| D. | photomultiplier tubes |
| Answer» D. photomultiplier tubes | |
| 27. |
Commonly used photoemissive material is _______ |
| A. | gold |
| B. | opium |
| C. | tellurium |
| D. | cesium-antimony |
| Answer» E. | |
| 28. |
Selenium cells are sensitive to almost the entire range of wavelengths of the spectrum. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 29. |
Photoconductive transducers produce output |
| A. | due to change in inductance |
| B. | due to change in light |
| C. | due to change in resistance |
| D. | due to change in temperature |
| Answer» D. due to change in temperature | |
| 30. |
Which of the following material is used to build photovoltaic cells ? |
| A. | selenium |
| B. | celenuim |
| C. | silicon |
| D. | iron |
| Answer» B. celenuim | |
| 31. |
Photoelectric transducers consist of _______ |
| A. | 1 transducer |
| B. | 3 transducers |
| C. | 5 transducers |
| D. | 10 transducers |
| Answer» C. 5 transducers | |
| 32. |
Optical radiations involve _________ |
| A. | optoelectric devices |
| B. | biological devices |
| C. | mechanical devices |
| D. | chemical devices |
| Answer» B. biological devices | |