Electrical Engineering MCQs

Page No. 20

In order to get more voltage gain from a transistor amplifier, the transistor used should have_________________?


aThin base

✓


bThin collector

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cWide emitter

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dNone of the above

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View Answer Thin base

In the d.c. equivalent circuit of a transistor amplifier, the capacitors are considered__________________?


aShort

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bOpen

✓


c Partially short

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d None of the above

✖


View Answer Open

The purpose of emitter capacitor (i.e. capacitor across RE) is to ______________?


aAvoid voltage gain drop

✓


bForward bias the emitter

✖


cReduce noise in the amplifier

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dNone of the above

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The purpose of d.c. conditions in a transistor is to___________________?


aReverse bias the emitter

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bForward bias the collector

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cSet up operating point

✓


dNone of the above

✖



In the a.c. equivalent circuit of a transistor amplifier, the capacitors are considered ___________________?


aShort

✓


bOpen

✖


cPartially open

✖


dNone of the above

✖


View Answer Short

If RC and RL represent the collector resistance and load resistance respectively in a single stage transistor amplifier, then a.c. load is____________________?


aRL + RC

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b RC || RL

✓


c RL – RC

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d RC

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View Answer RC || RL

The purpose of capacitors in a transistor amplifier is to___________________?


aProtect the transistor

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bCool the transistor

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cCouple or bypass a.c. component

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dProvide biasing

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In a CE amplifier, voltage gain =____________________ x RAC/Rin?


aα

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b (1 + α)

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c(1+ β)

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dβ

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View Answer β

If the power and current gains of a transistor amplifier are 16500 and 100 respectively, then voltage gain is_____________________?


a165

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b165 x 104

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c100

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d None of the above

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View Answer 165

In a CE amplifier, the phase difference between voltage across collector load RC and signal voltage is _________________?


a180o

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b270o

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c90o

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d0o

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View Answer 0o

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