Electrical Engineering MCQs

Page No. 128

A series resistance is connected in the zener circuit to_______________?


aproperly reverse bias the zener

✖


bprotect the zener

✓


cproperly forward bias the zener

✖


dnone of the above

✖


View Answer protect the zener

Which of the following is not associated with a p-n junction?


ajunction capacitance

✖


bcharge storage capacitance

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cdepletion capacitance

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dchannel length modulation

✓



In the breakdown region, a zener didoe behaves like a _______________source?


aconstant voltage

✓


bconstant current

✖


cconstant resistance

✖


dnone of the above

✖


View Answer constant voltage

A zener diode is________________ device?


aa non-linear

✓


ba linear

✖


c an amplifying

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d none of the above

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View Answer a non-linear

Mains a.c. power is converrted into d.c. power for_________________?


alighting purposes

✖


b heaters

✖


cusing in electronic equipment

✓


dnone of the above

✖



The ripple factor of a half-wave rectifier is_________________?


a2

✖


b1.21

✖


c2.5

✖


d0.48

✓


View Answer 0.48

The maximum efficiency of a half-wave rectifier is _____________?


a40.6 %

✓


b81.2 %

✖


c50 %

✖


d25 %

✖


View Answer 40.6 %

For the same secondary voltage, the output voltage from a centre-tap rectifier is___________ than that of bridge rectifier?


a twice

✖


b thrice

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c four time

✖


done-half

✓


View Answer one-half

IC = [a / (1 – a )] IB +_____________?


aICEO

✓


bICEO

✖


c IC

✖


d(1 – a ) IB

✖


View Answer ICEO

A half-wave rectifier has an input voltage of 240 V r.m.s. If the step-down transformer has a turns ratio of 8:1, what is the peak load voltage? Ignore diode drop?


a27.5 V

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b86.5 V

✖


c30 V

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d42.5 V

✓


View Answer 42.5 V

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