Photoelectric Transducers

This set of Electrical Measurements & Measuring Instruments Multiple Choice Questions & Answers (MCQs) focuses on “Photoelectric Transducers”.

1. Optical radiations involve _________
a) optoelectric devices
b) biological devices
c) mechanical devices
d) chemical devices

2. Photoelectric transducers consist of _______
a) 1 transducer
b) 3 transducers
c) 5 transducers
d) 10 transducers

3. 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

4. Commonly used photoemissive material is _______
a) gold
b) opium
c) tellurium
d) cesium-antimony

5. Phototubes are very quick in response to light.
a) True
b) False

6. Photoconductors are made of _______
a) thick layer of semiconductor
b) thin layer of semiconductor
c) capacitive substrate
d) inductive substrate

7. 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

8. Optocoupler consists of a phototransistor and a led.
a) True
b) False

9. Response time for gas-filled phototubes is _______
a) zero
b) intermediate
c) fast
d) slow

10. 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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