1.

Consider a unity feedback configuration with a plant and a PID controller as shown in the figure. \(G(s) = \frac{1}{(s+1)(s+3)}\) and \(C(s) = K \frac{(s+3-j)(s+3+j)}{s}\)with K being scaler. the closed loop is

A. only stable for K > 0
B. only stable for K between -1 and +1
C. only stable for K < 0
D. stable for all values of K
Answer» B. only stable for K between -1 and +1


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