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Photoelectric Transducers MCQ Questions & Answers

Photoelectric Transducers MCQs : This section focuses on the "Photoelectric Transducers". These Multiple Choice Questions (MCQs) should be practiced to improve the Photoelectric Transducers skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations.




Question 1

Cesium-silver oxide cells are sensitive to the near infrared wavelengths.

A. True
B. False

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Question 2

Commonly used photoemissive material is _______

A. gold
B. opium
C. tellurium
D. cesium-antimony

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Question 3

Optical radiations involve _________

A. optoelectric devices
B. biological devices
C. mechanical devices
D. chemical devices

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Question 4

Optocoupler consists of a phototransistor and a led.

A. True
B. False

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Question 5

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

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Question 6

Photoconductors are made of _______

A. thick layer of semiconductor
B. thin layer of semiconductor
C. capacitive substrate
D. inductive substrate

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Question 7

Photo-diodes work in _________

A. forward biased
B. reverse biased
C. independent of forward and reverse biasing
D. any configuration

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Question 8

Photoelectric transducers consist of _______

A. 1 transducer
B. 3 transducers
C. 5 transducers
D. 10 transducers

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Question 9

Phototubes are very quick in response to light.

A. True
B. False

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Question 10

Photovoltaic cells need an external electrical supply to function.

A. True
B. False

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Question 11

Response time for gas-filled phototubes is _______

A. zero
B. intermediate
C. fast
D. slow

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Question 12

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

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Question 13

Selenium cells are sensitive to almost the entire range of wavelengths of the spectrum.

A. True
B. False

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Question 14

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

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Question 15

Thermister is used to measure ____________

A. temperature
B. pressure
C. height
D. displacement

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Question 16

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

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Question 17

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

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Question 18

Which of the following is a photoemissive cell?

A. photomultiplier tubes
B. barrier layer cell
C. galvanic cell
D. rochell-salt cell

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Question 19

Which of the following material is used to build photovoltaic cells?

A. selenium
B. celenuim
C. silicon
D. iron

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