A unity negative feedback system has the open – loop transfer function G (s) = \frac{k}{s (s + 1) (s + 3) }. The value of the gain K( > 0) at which the root locus crosses the imaginary axis is _________.

GATE Electronics and Communications (EC) 2015 Shift 1 Solved Paper

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A unity negative feedback system has the open – loop transfer function

G (s) = \;{k}/{s\;(s\;+\;1)\;\;(s\;+\;3)\;}

. The value of the gain

K( > 0)

at which the root locus crosses the imaginary axis is _________.

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