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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 the case of a common emitter transistor amplifier the ratio of the collector current to the emitter current \[{{I}_{c}}/{{I}_{e}}\] is \[0.96\]. The current gain of the amplifier is

    A)  \[6\]

    B)  \[48\]  

    C)  \[24\]

    D)  \[12\]

    Correct Answer: C

    Solution :

    [c] \[\frac{{{I}_{c}}}{{{I}_{e}}}=0.96\Rightarrow \,\,\,{{I}_{c}}=0.96\,{{I}_{e}}\] But  \[{{I}_{e}}={{I}_{c}}+{{I}_{b}}=0.96{{I}_{e}}+{{I}_{b}}\] \[\therefore \] Current gain \[\beta =\frac{{{I}_{c}}}{{{I}_{b}}}=\frac{0.96{{I}_{e}}}{0.04{{I}_{e}}}=24\]


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