Q.

An NPN transistor is used in common emitter configuration as an amplifier with 1kΩ  load resistance. Signal voltage of 10 mV is applied across the base-emitter. This produces a 3 mA change in the collector current and 15μA  change in the base current of the amplifier. The input resistance and voltage gain are:

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a

0.33kΩ,300

b

0.67kΩ,300

c

0.33kΩ,1.5

d

0.67kΩ,200

answer is B.

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Detailed Solution

ICIB=200 , IBRi=V , Ri=23k ohm=0.67k ohm  Voltage gain = ICIB×RCRI=200×100023×1000=300
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An NPN transistor is used in common emitter configuration as an amplifier with 1kΩ  load resistance. Signal voltage of 10 mV is applied across the base-emitter. This produces a 3 mA change in the collector current and 15μA  change in the base current of the amplifier. The input resistance and voltage gain are: