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  1. An electromechanical closed loop control system has the following characteristics equation :s3 + 6Ks2 + (K + 2)s = 8
    where K is the forward gain of the system. The condition for closed loop stability is

  2. A.
    K = 0.528
    B.
    K = 2
    C.
    K = 0
    D.
    K = -2528

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    Answer : Option A

    Explanation :

    s3 + 6ks2 + (k + 2)s + 8 = 0

    a0 = 1, a1 = 6k, a2 = k + 2, a3 = 8

    Apply R.H. criteria.


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