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  1. The characteristic equation of a feedback control system is given by s3 + 5s2 + (K + 6)s + K = 0
    where K > 0 is a scalar variable parameter. In the root-loci diagram of the system the asymptotes of the root-locus for large values of K meet at a point in the s-plane, whose coordinates are :

    2. A.
    (- 3, 0)
    B.
    (- 2, 0)
    C.
    (- 1, 0)
    D.
    (2, 0)

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    Answer : Option C

    Explanation :

    Apply R-H, and find ω by auxiliary equation.

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