Electronic Devices and Circuits - ECE Questions and Answers

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Silicon is not suitable for fabrication of light emitting diodes because it is

An indirect band gap semiconductor

Direct band gap semiconductor

Wideband gap semiconductor

Narrowband gap semiconductor

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When avalanche breakdown occurs covalent bonds are not affected.

True

False

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Which variety of copper has the best conductivity?

Pure annealed copper

Hard drawn copper

Induction hardened copper

Copper containing traces of silicon

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Free electrons exist in

First band

Second band

Third band

Conduction band

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In a half wave rectifier, the load current flows

Only for the positive half cycle of the input signal

Only for the negative half cycle of the input signal

For full cycle

For less than fourth cycle

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Assertion (A): In p-n-p transistor collector current is termed negative.
Reason (R): In p-n-p transistor holes are majority carriers.

Both A and R are true and R is correct explanation of A

Both A and R are true but R is not a correct explanation of A

A is true but R is false

A is false but R is true

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How many free electrons does a p type semiconductor has?

Only those produced by thermal energy

Only those produced by doping

Those produced by doping as well as thermal energy

Any of the above

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Light dependent resistors are

Highly doped semiconductor

Intrinsic semiconductor

Lightly doped semiconductor

Either A or B

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In a bipolar transistor, the emitter base junction has

Forward bias

Reverse bias

Zero bias

Zero or reverse bias