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

  • question_answer
    In common emitter amplifier, the current gain is 62. The collector resistance and input resistance are \[5\,k\Omega \] an \[500\,\Omega \] respectively. If the input voltage is \[0.01\,V,\] the output voltage is   

    A)  \[0.62\,V\]

    B)  \[6.2\,V\]

    C)  \[62\,V\]

    D)  \[620\,V\]

    Correct Answer: B

    Solution :

    [b] \[\frac{{{V}_{o}}}{{{V}_{in}}}=\frac{{{R}_{o}}}{{{R}_{in}}}\times \beta =\frac{5\times {{10}^{3}}\times 62}{500}=10\times 62=620\] \[{{V}_{o}}=620\times {{V}_{in}}=620\times 0.01=6.2V\] \[\therefore \,\,\,\,\,\,\,\,\,\,{{V}_{o}}=6.2\] volt.


You need to login to perform this action.
You will be redirected in 3 sec spinner