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

  • question_answer
    The current in a triode at anode potential 100 V and grid potential ? 1.2 V is 7.5 mA. If grid potential is changed to ? 2.2 V, the current becomes 5.5 mA. the value of trans conductance (gm) will be                                              [RPMT 2003]

    A)            2 mili mho                             

    B)            3 mili mho

    C)            4 mili mho                             

    D)            0.2 mili mho

    Correct Answer: A

    Solution :

               \[{{g}_{m}}={{\left( \frac{\Delta {{I}_{p}}}{\Delta {{V}_{g}}} \right)}_{{{V}_{p}}=\text{constant}}}=\frac{(7.5-5.5)}{-1.2-(-2.2)}=2m\,mho\]


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