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

  • question_answer
    In a common emitter transistor amplifier the audio signal voltage across the collector is\[3V\]. The resistance of collector is \[3\,k\Omega \]. If current gain is 100 and the base resistance is \[2\,k\Omega ,\] the voltage and power gain of the amplifier is

    A)  15 and 200

    B)  150 and 15000

    C)  20 and 2000

    D)  200 and 1000

    Correct Answer: B

    Solution :

    [b] Given, current gain \[\beta =100,\] \[{{R}_{c}}=3k\Omega ,\] \[{{R}_{b}}=2k\Omega \] Voltage gain \[({{A}_{v}})=\beta \frac{{{R}_{c}}}{{{R}_{b}}}=100\left( \frac{3}{2} \right)=150\] Power gain \[={{A}_{v}}\beta =150\,\,(100)=15000\]


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