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JEE Main & Advanced Physics Semiconducting Devices Question Bank Self Evaluation Test - Semiconductor Electronics: Materials, Devices and Simple Circuits

  • question_answer
    A common emitter amplifier has a voltage gain of 50, an input impedance of \[100\Omega \] and an output impedance of \[200\Omega \]. The power gain of the amplifier is

    A)  \[1000\]

    B)  \[1250\]

    C)  \[100\]

    D)  \[500\]

    Correct Answer: B

    Solution :

    [b] Voltage gain \[=\beta \times \] Impedance gain \[50=\beta \times \frac{200}{100}=2\beta \Rightarrow \beta =25\] and power gain \[={{\beta }^{2}}\times \frac{200}{100}=1250.\]


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