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VIT Engineering VIT Engineering Solved Paper-2015

  • question_answer
    The input resistance of a common emitter amplifier is 330 \[\Omega \]. and the load resistance is \[5k\Omega .\]. A change of base current is \[15\mu A\]results in the change of collector current by 1 mA. The voltage gain of amplifier is

    A) 1000                                      

    B) 10001

    C) 1010                                      

    D) 1100

    Correct Answer: C

    Solution :

    Given             \[\tan \phi =-2\cot \left( 90+\lambda  \right)\]             \[\Rightarrow \]             \[\tan \phi =2\tan \lambda \]              \[{{\theta }_{1}}\] The voltage gain of an amplifier is given by              \[{{\theta }_{2}}\]                \[\text{W=MB}\left( \text{cos}{{\text{ }\!\!\theta\!\!\text{ }}_{\text{1}}}\text{-cos}{{\text{ }\!\!\theta\!\!\text{ }}_{\text{2}}} \right)\]              \[=MB\left( \cos {{0}^{\circ }}-\cos {{45}^{\circ }} \right)\]


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