In a control system with unity gain feedback, the plant has the transfer function P(s) = 3/s. Assuming that a controller of the form C(s) = K/ (s + P) is used, where K is a positive constant, the value of P for which the root-locus of the closed-loop system passes through the points \(- 3 \pm j3\sqrt 3\) where \(j = \sqrt { - 1}\), is

In a control system with unity gain feedback, the plant has the transf

1.	In a control system with unity gain feedback, the plant has the transfer function P(s) = 3/s. Assuming that a controller of the form C(s) = K/ (s + P) is used, where K is a positive constant, the value of P for which the root-locus of the closed-loop system passes through the points \(- 3 \pm j3\sqrt 3\) where \(j = \sqrt { - 1}\), is
A.	3
B.	\(3\sqrt 3\)
C.	6
D.	9
Answer» D. 9

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