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

Options

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

Answer

C

Explanation

`i_(c)=(3)/(3xx10^(3))A=10^(-3)A`
`i_(b)=(i_(c))/(beta)=10^(-5)A`
`R_(b)=200Omega`
`V_("in")=R_(b)i_(b)=2xx10^(-2)"volt"`
So, voltage gain `=(3)/(2xx10^-2))=150`
Power gain `=150xx100=15000`.