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JEE Main & Advanced Physics Semiconducting Devices Question Bank Valve Electronics (Diode and Triode)

  • question_answer
    The amplification factor of a triode is 20. If the grid potential is reduced by 0.2 volt then to keep the plate current constant its plate voltage is to be increased by  [RPMT 1993, 95]

    A)            10 volt                                     

    B)            4 volt

    C)            40 volt                                     

    D)            100 volt

    Correct Answer: B

    Solution :

               \[\mu =-\frac{\Delta {{V}_{p}}}{\Delta {{V}_{G}}}\]\[\Rightarrow \Delta {{V}_{p}}=-\mu \,\Delta {{V}_{G}}=-20\times (-0.2)\] = 4V.


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