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NEET AIPMT SOLVED PAPER SCREENING 2010

  • question_answer
    A common emitter amplifier has a voltage gain of 50, an input impedance of 100\[\Omega \] and an output impedance of 200\[\Omega \].The power gain the amplifier is

    A) 500                        

    B)        1000

    C) 1250                      

    D)        50

    Correct Answer: C

    Solution :

    Voltage gain\[=\beta \times \]impedance gain \[\Rightarrow \]               \[50=\beta \times \frac{200}{100}\Rightarrow \beta =25\] Also, power gain \[={{\beta }^{2}}\times \] impedance gain        \[={{(25)}^{2}}\times \frac{200}{100}=1250\]


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