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


cWide emitter


dNone of the above


View Answer Thin base

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


aShort


bOpen


c Partially short


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


dNone of the above



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


aReverse bias the emitter


bForward bias the collector


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


b RC || RL


c RL – RC


d RC


View Answer RC || RL

The purpose of capacitors in a transistor amplifier is to___________________?


aProtect the transistor


bCool the transistor


cCouple or bypass a.c. component


dProvide biasing



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


aα


b (1 + α)


c(1+ β)


dβ


View Answer β

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


a165


b165 x 104


c100


d None of the above


View Answer 165

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


a180o


b270o


c90o


d0o


View Answer 0o

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