ELECTRONIC DEVICES AND CIRCUITS QUIZ

Work function is the maximum energy required by the fastest electron at 0 K to escape from the metal surface.

True

False

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In a semiconductor diode, the barrier offers opposition to

Majority carriers in both regions

Majority as well as minority carriers in both regions

Free electrons in N-region only

Holes in P-region only

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For a P-N diode, the number of minority carriers crossing the junction depends on

None of these

Forward bias voltage

Potential barrier

Rate of thermal generation of electron hole pairs

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If too large current passes through the diode

All holes will freeze

All electrons will leave

Diode will emit light

Excessive heat may damage the diode

TRUE ANSWER : ?
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When avalanche breakdown occurs covalent bonds are not affected.

True

False

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

Drift of holes

Drift of electrons

Diffusion of electrons

Diffusion of holes

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Forbidden energy gap in germanium at 0 K is about

0.78 eV

2 eV

10 eV

5 eV

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Hall effect is observed in a specimen when it is carrying current and is placed in a magnetic field. The resultant electric field inside the specimen is

In the direction of current

Antiparallel to magnetic field

In arbitrary direction

Normal to both current and magnetic field

TRUE ANSWER : ?
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At room temperature the current in an intrinsic semiconductor is due to

Electrons

Ions

Holes

Holes and electrons

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Which of the following could be the maximum current rating of junction diode by 126?

20 A

10 A

1 A

100 A

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