Semiconductor Diode Multiple - EEE Questions and Answers

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The ripple factor of a half-wave rectifier is ___________

A.

2

B.

1.21

C.

2.5

D.

0.48

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The maximum efficiency of a half-wave rectifier is ___________

A.

40.6%

B.

81.2%

C.

50%

D.

25%

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The most widely used rectifier is ___________

A.

half-wave rectifier

B.

centre-tap full-wave rectifier

C.

bridge full-wave rectifier

D.

none of the above

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A zener diode has ___________

A.

one pn junction

B.

two pn junctions

C.

three pn junctions

D.

none of the above

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If the doping level in a crystal diode is increased, the width of depletion layer___________

A.

remains the same

B.

is decreased

C.

in increased

D.

none of the above

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A series resistance is connected in the zener circuit to___________

A.

properly reverse bias the zener

B.

protect the zener

C.

properly forward bias the zener

D.

none of the above

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The forward voltage drop across a silicon diode is about ___________

A.

2.5 V

B.

3 V

C.

10 V

D.

0.7 V

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The ratio of reverse resistance and forward resistance of a germanium crystal diode is about ___________

A.

1 : 1

B.

100 : 1

C.

1000 : 1

D.

40000 : 1

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The PIV rating of a crystal diode is ___________ that of equivalent vacuum diode

A.

the same as

B.

lower than

C.

more than

D.

none of the above