1.

The open loop transfer function of a unity feedback system is\(G(S) = \frac{K}{{S\left( {{S^2} + S + 2} \right)\left( {S + 3} \right)}}\)The range of K for which the system is stable is

A. \(\frac{{21}}{{4}} > K > 0\)
B. 13 > K > 0
C. \(\frac{{21}}{{44}} < K < \infty\)
D. -6 < K < ∞
Answer» B. 13 > K > 0


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