Q.

In a common emitter transistor amplifier the audio signal voltage across the collector is 3 V. The resistance of collector is 3 kΩ. If current gain is 100 and the base resistance is 2kΩ, the voltage and power gain of the amplifier is

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a

15 and 200

b

150 and 15000

c

20 and  2000

d

200 and 1000

answer is B.

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Detailed Solution

Given: Vi=3 V,RC=3kΩ,Rp=2kΩ, β=100Voltage gain of the CE amplifier, AV=-βacRCRB=-10032=-150Power gain, AP=β×AV=100×(-150)=-15000Negative sign represents that output voltage is in opposite phase with the input voltage.
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