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


cdepletion capacitance


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


d none of the above


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


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


b86.5 V


c30 V


d42.5 V


View Answer 42.5 V

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