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

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cQuiescent operating point

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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

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cthe drain current increases

✖


dnone of the above

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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

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dnone of the above

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


acomponents are expensive

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bdiodes must have a higher power rating

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coutput is difficult to filter

✓


dnone of the above

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A zener diode has ______________ breakdown voltage?


a undefined

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b sharp

✓


c zero

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d none of the above

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View Answer sharp

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