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The open-loop transfer function of a unity feedback system is K/(s^^2 (s+5))The system is unstable for

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The open-loop transfer function of a unity feedback system is K/(s^^2 (s+5))The system is unstable for

(a) K>5

(b) K<5

(c) K>0

(d) All of the mentioned

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This question is from Construction of Phase-Trajectories in section Nonlinear Systems of Control Systems

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Correct option is (d) All of the mentioned

The explanation: The open loop transfer function of a unity feedback system is used to calculate the conditional stability by using the Routh Hurwitz criteria or the Root locus technique.

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