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JAMIA MILLIA ISLAMIA Jamia Millia Islamia Solved Paper-2009

  • question_answer
        The voltage gain of an amplifier without feedback is 100. If a negative feedback is introduced with a feedback fraction\[p=0.1,\] then the gain of the feedback amplifier is

    A)  9.09                                      

    B)  10

    C)  100.1                                   

    D)  90.0

    Correct Answer: A

    Solution :

                    \[{{A}_{f}}=\frac{A}{11+A}=\frac{100}{1+0.1\times 100}\] \[{{A}_{f}}=\frac{100}{1+10}=\frac{100}{11}\] \[{{A}_{f}}=9.09\]


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