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Discussion :: Automatic Control Systems

  1. The polar plot of a transfer function passes through (-1, 0) point. The gain margin is

    2. A.
    zero
    B.
    - 1 dB
    C.
    1 dB
    D.
    infinity

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    Answer : Option A

    Explanation :

    When polar plot passes through (-1, 0) the system is on limit of stability and gain margin is zero.

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