What type of semiconductor is used in LED electronic circuits? - Electronic Devices and Circuits

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

What type of semiconductor is used in LED electronic circuits?

A)

Intrinsic semiconductor

B)

Degenerated semiconductor

C)

Compound semiconductor

D)

Compensated semiconductor

Correct Answer : Option (C) : Compound semiconductor

Explanation : LEDs need compound type semiconductors because they have direct band gap. In direct band gap, photons are easily generated when electrons release energy during recombination.

Recently Updated in Electronic Devices and Circuits Questions

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

ECE MCQ's

Power Electronics

Digital Electronics

Analog Electronics

Microprocessors

Radio Receivers

Signals and Systems

Satellite Communication

Communication Systems

Microwave Communication

Automatic Control Systems

Materials and Components

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