In an n-p-n transistor biased for operation in forward active region

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

emitter is positive with respect to base

collector is positive with respect to base

base is positive with respect to emitter and collector is positive with respect to base

None of the above

Correct Answer : Option (C) : base is positive with respect to emitter and collector is positive with respect to base

Explanation : In forward active mode emitter base junction is forward biased and base collector junction is reverse biased.

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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