Electrical Engineering MCQs

Page No. 127

The bandwidth of an RF tuned amplifier is dependent on____________?


aQ –factor of the tuned o/p circuit


bQ –factor of the tuned i/p circuit


cQuiescent operating point


dQ-factor of the o/p and i/p circuits as well as quiescent operating point



A constant current signal across a parallel RLC circuits gives an o/p of 1.4v at the signal frequency of 3.89KHZ and 4.1KHZ .At the frequency of 4KHZ,the o/p voltage will be___________?


a1 v


b 2v


c1.4v


d2.8v


View Answer 2v

In a p-n junction diode under reverse bias , the magnitude of electric field is maximum at_____________?


athe edge of the depletion region on the p-side


bthe edge of the depletion region on the n-side


cthe p-n junction


dthe center of the depletion region on the n-side


View Answer the p-n junction

A change in the value of the emitter resistance Re in a differential amplifier?


aaffects the difference mode gain Ad


b affects the common mode gain Ac


caffects both Ad and Ac


d does not effect either Ad and Ac



Thermal runaway is not possible in FET because as the temperature of FET increases_________________?


athe mobility decreases


b the transconductance increases


cthe drain current increases


dnone of the above



A zener diode utilizes ______________ characteristics for its operation?


aforward


breverse


cboth forward and reverse


dnone of the above


View Answer reverse

If the a.c. input to a half-wave rectifier is an r.m.s value of 400/√2 volts, then diode PIV rating is__________________?


a 400/√2 V


b400 V


c400 x √2 V


dnone of the above


View Answer 400 V

There is a need of transformer for__________________?


ahalf-wave rectifier


bcentre-tap full-wave rectifier


cbridge full-wave rectifier


dnone of the above



The disadvantage of a half-wave rectifier is that the__________________?


acomponents are expensive


bdiodes must have a higher power rating


coutput is difficult to filter


dnone of the above



A zener diode has ______________ breakdown voltage?


a undefined


b sharp


c zero


d none of the above


View Answer sharp

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