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

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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

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b Protect the transistor

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

✓


dProvide biasing

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


a10 db

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b20 db

✓


c40 db

✖


dNone of the above

✖


View Answer 20 db

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