Question: E7.28 Consider the feedback system in Figure E7.28. Obtain the negative gain root locus as K0. For what values of K is the system
E7.28 Consider the feedback system in Figure E7.28. 
Obtain the negative gain root locus as −∞ K 0.
For what values of K is the system stable?
Controller Process Ed(s) R(s) Ge(s) G(s) Y(s) FIGURE E7.28 Feedback system for negative gain root locus.
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