# Electronics and Communication Engg - ECE

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GATE 2007   EC   Question No. 55

A unity feedback control system has an open-loop transfer function $G\left(s\right)=\frac{K}{s\left({s}^{2}+7s+12\right)}$. The gain K for which s = -1 + j1 will lie on the root locus of this system is