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NEET Physics Semiconducting Devices NEET PYQ-Semiconducting Devices

  • question_answer
    In a common emitter transistor amplifier the audio signal voltage across the collector is 3 V. 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                                                                                                                      [NEET-2017]

    A)  20 and 2000    

    B)       200 and 1000

    C)  15 and 200      

    D)       150 and 15000

    Correct Answer: D

    Solution :

    [d] Current gain\[(\beta )=100\]
    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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