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  1. The output resistance of a microphone is 20 ohms. It is to feed a line of impedance 320 ohms. To ensure maximum power transfer, the turn ratio of transformer is

    2. A.
    16
    B.
    256
    C.
    2
    D.
    4

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    Answer : Option D

    Explanation :

    (20)(4)2 = 320 ohms.

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