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If beta, R(L) and r are the AC current g...

If `beta, R_(L)` and r are the AC current gain, load resistance and the input resistance of a transistor respectively in CE configuration, the voltage and the power gains respectively are

A

`beta(R_(L))/(r)andbeta^(2)(R_(L))/(r)`

B

`beta(r)/(R_(L))andbeta^(2)(r)/(R_(L))`

C

`beta(R_(L))/(r)andbeta((R_(L))/(r))^(2)`

D

`beta(r)/(R_(L))andbeta((r)/(R_(L)))^(2)`

Text Solution

Verified by Experts

The correct Answer is:
A
Voltage gain = current gain x resistance gain
`=betaxx("output resistance")/("input resistance")=betaxx(R_(L))/(r)`
Power gain = voltage gain x current gain
`=beta(R_(L))/(r)xxbeta=beta^(2)(R_(L))/(r)`
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