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NEET Sample Paper NEET Sample Test Paper-43

  • question_answer
    In a common-emitter amplifier, output resistance is \[5000\,\Omega \] and input resistance is \[2000\,\Omega \]. If peak value of signal voltage is 10 mV and\[\beta =50\], then the peak value of output voltage is -

    A) \[5\times {{10}^{-6}}\]volt      

    B) \[2.5\times {{10}^{-4}}\]volt

    C) 1.25 volt           

    D) 125 volt

    Correct Answer: C

    Solution :

    \[{{A}_{V}}=(\beta )\](resistance gain) \[\frac{{{V}_{out}}}{{{V}_{in}}}=50\left( \frac{5000}{2000} \right)\] \[{{V}_{out}}=125\times {{V}_{in}}\] \[{{V}_{out}}=125\times 10\times {{10}^{-3}}\] \[{{V}_{out}}=1.25\,\,Volt\]


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