Electrical Engineering MCQs

Page No. 19

A transistor amplifier has high output impedance because ______________?


aEmitter is heavily doped


bCollector has reverse bias


cCollector is wider than emitter or base


d None of the above



CC configuration is used for impedance matching because its ________________?


aInput impedance is very high


bInput impedance is low


cOutput impedance is very low


dNone of the above



The d.c. load of a transistor amplifier is generally_______________ that of a a.c. load?


aThe same as


bLess than


cMore than


dNone of the above


View Answer More than

If the input capacitor of a transistor amplifier is short-circuited, then_________________?


aTransistor will be destroyed


bBiasing conditions will change


cSignal will not reach the base


dNone of the above



A CE amplifier is also called _______________ circuit?


aGrounded emitter


bGrounded base


cGrounded collector


dNone of the above


View Answer Grounded emitter

If a transistor amplifier feeds a load of low resistance (e.g. speaker), then voltage gain will be_______________?


aHigh


bVery high


cModerate


dLow


View Answer Low

The radio wave picked up by the receiving antenna is amplified about _________________ times to have reasonable sound output?


a1000


b A million


c100


d10000


View Answer A million

The ratio of output impedance of a CE amplifier is _______________?


aAbout 1


bLow


cHigh


dModerate


View Answer Moderate

The purpose of a coupling capacitor in a transistor amplifier is to ___________________?


aIncrease the output impedance of transistor


b Protect the transistor


c Pass a.c. and block d.c.


dProvide biasing



An amplifier has a power gain of 100. Its db gain is ________________?


a10 db


b20 db


c40 db


dNone of the above


View Answer 20 db

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