1.

The gain at the breakaway point of the root locus of a unity feedback system with open loop transfer function\(G\left( s \right) = \frac{{Ks}}{{\left( {s - 1} \right)\left( {s - 4} \right)}}\) is

A. 1
B. 2
C. 5
D. 9
Answer» B. 2


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