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  3. CEE Kerala Engineering

CEE Kerala Engineering CEE Kerala Engineering Solved Paper-2006

  • question_answer
    If\[\alpha \]and\[\beta \]are the current gain in the CB and CE configurations respectively of the transistor circuit, then\[\frac{\beta -\alpha }{\alpha \beta }=\]

    A)  infinite                

    B)         1

    C)  2                            

    D)  0.5

    E)  zero

    Correct Answer: B

    Solution :

    The relation between\[\alpha \]and\[\beta \]is \[\beta =\frac{\alpha }{1-\alpha }\] Putting this value in the given equation, we have                 \[\frac{\beta -\alpha }{\alpha \beta }=\frac{\frac{\alpha }{1-\alpha }-\alpha }{\alpha .\frac{\alpha }{1-\alpha }}=\frac{{{\alpha }^{2}}}{{{\alpha }^{2}}}=1\]


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