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Question

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

A
20 and 2000
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B
200 and 1000
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C
15 and 200
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D
150 and 15000
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Solution

The correct option is D 150 and 15000
vc=3v
Rc=3000Ω
B=100
Ic=VcRC=33000=103A
Ib=IcB=103100=105A
Vb=IbRb=105×2000=2×102V
voltage gain =VcVb=32×102=150
Power gain = B \times voltage gain
=100×150
15000

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