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  1. The transfer function of a system is . The characteristic equation of the system is :

    2. A.
    2s2 + 6s + 5 = 0
    B.
    (s + l)2 (s + 2) = 0
    C.
    2s2 + 6s + 5 + (s + 1 )2(s + 2) = 0
    D.
    2s2 + 6s + 5 - (s + l)2(s + 2) = 0

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    Answer : Option C

    Explanation :

    Characteristic equation = 1 + GH = 0

    (s + 1)2(s + 2) + (2s2 + 6s + s) = 0

    Apply R-H.

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