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A common emitter amplifier gives an out...

A common emitter amplifier gives an output of 3V for an input of 0.01 V . If `beta` of the transistor is 100 and the input resistance is `kOmega` , then the collector resistance is

A

A)`1KOmega`

B

B)`3kOmega`

C

C)`30kOmega`

D

D)`30Omega`

Text Solution

Verified by Experts

The correct Answer is:
B
In common emitter amplifier Voltage gain = current gain `xx` resistance gain
or `A_(v)=betaxx(R_(o))/(R_(i))`
or `(V_(o))/(V_(i))=beta(R_(o))/(R_(i))`
or `(3)/(0.01)=100xx(R_(o))/(1xx10^(3))``orR_(o)=(30)/(0.01)=3kOmega`
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Knowledge Check

  • A common emitter amplifier gives an output of 3 V foran input of 0.01 V. If beta of the transistor is 100 and the input resistance is 1kOmega , then the collector resistance is

    A
    `1kOmega`
    B
    `3kOmega`
    C
    `30kOmega`
    D
    `30Omega`

  • A common emitter amplifier gives an output of 3 V for an input of 0.01 V. If beta of the transistor is 100 and the input resistance is 1k Omega, then the collector resistance is

    A
    `1k Omega`
    B
    `3k Omega`
    C
    `30 k Omega`
    D
    `30 Omega`

  • In a common-emitter amplifier, using output resistance of 5000 ohm and input resistance of 2000 ohm, if the peak value of input signal voltage is 10mV and beta = 50, then the peak value of output voltage is

    A
    `5xx10^(-6)` volt
    B
    `2.5xx10^4` volt
    C
    `1.25` volt
    D
    125 volt

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