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.
Cesium-silver oxide cells are sensitive to the near infrared wavelengths.
Commonly used photoemissive material is _______
Optical radiations involve _________
A. optoelectric devices
B. biological devices
C. mechanical devices
D. chemical devices
Optocoupler consists of a phototransistor and a led.
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
Photoconductors are made of _______
A. thick layer of semiconductor
B. thin layer of semiconductor
C. capacitive substrate
D. inductive substrate
Photo-diodes work in _________
A. forward biased
B. reverse biased
C. independent of forward and reverse biasing
D. any configuration
Photoelectric transducers consist of _______
A. 1 transducer
B. 3 transducers
C. 5 transducers
D. 10 transducers
Phototubes are very quick in response to light.
Photovoltaic cells need an external electrical supply to function.
Response time for gas-filled phototubes is _______
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
Selenium cells are sensitive to almost the entire range of wavelengths of the spectrum.
The instruments which give a direct reading of the temperature at the thermistor position are known as _________
Thermister is used to measure ____________
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
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
Which of the following is a photoemissive cell?
A. photomultiplier tubes
B. barrier layer cell
C. galvanic cell
D. rochell-salt cell
Which of the following material is used to build photovoltaic cells?