Stability Theory » Exercise – 1
30. The characteristic equation 1 + G(s)H(s) = 0 of a system is given by s4 + 8s3 +12s2 +8s + K = 0 For the system to remain stable, the value of gain K should be :
(a) zero
(b) 0< K
(c) >11
(d) positives
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