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  1. Consider a control system shown in given figure. For slight variation in G, the ratio of open loop sensitivity to closed loop sensitivity will be given by

    2. A.
    1 : (1 + GH)
    B.
    1 : (1 + GH)- 1
    C.
    1 : (1 - GH)
    D.
    1 : (1 - GH)- 1

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    Answer : Option B

    Explanation :

    Open loop sensitivity = 1

    Closed loop sensitivity =

    Hence ratio = 1 : (1 + GH) - 1.

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