For a NPN bipolar transistor, what is the main stream of current in the base region? - Electronic Devices and Circuits

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

For a NPN bipolar transistor, what is the main stream of current in the base region?

A)

Drift of electrons

B)

Drift of holes

C)

Diffusion of electrons

D)

Diffusion of holes

Correct Answer : Option (D) : Diffusion of holes

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

A)

angle of incidence of radiation

B)

surface conditions of the surface

C)

intensity of the incident radiation

D)

wavelength of the incident radiation

Correct Answer : wavelength of the incident radiation

For radiating ultraviolet rays, LEDs use

A)

gallium arsenide

B)

zinc sulphide

C)

gallium phosphide

D)

None of the above

Correct Answer : zinc sulphide

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

A)

emitter base : reverse, collector base : reverse

B)

emitter base : reverse, collector base : forward

C)

emitter base : forward, collector base : forward

D)

emitter base : forward, collector base : reverse

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

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