If the reverse voltage across a p-n junction is increased three times, the junction capacitance

Electronics and Communication Engineering (ECE) : Electronic Devices and Circuits - Quiz(MCQ)

will increase

will decrease

will decrease by an approximate factor of about 2

will increase by an approximate factor of about 2

Correct Answer : Option (C) : will decrease by an approximate factor of about 2

Explanation : Increase of reverse voltage widens the depletion layer and junction capacitance decreases. However the decrease in capacitance is not proportional to increase in voltage.

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The kinetic energy of photoelectrons emitted by a photo sensitive surface depends on

angle of incidence of radiation

surface conditions of the surface

intensity of the incident radiation

wavelength of the incident radiation

Correct Answer : wavelength of the incident radiation

For radiating ultraviolet rays, LEDs use

gallium arsenide

zinc sulphide

gallium phosphide

None of the above

Correct Answer : zinc sulphide

For an P-N-P transistor in normal operation its junction are biased as

emitter base : reverse, collector base : reverse

emitter base : reverse, collector base : forward

emitter base : forward, collector base : forward

emitter base : forward, collector base : reverse

Correct Answer : emitter base : forward, collector base : reverse

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