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OLTF contains one zero in right half of s-plane then

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OLTF contains one zero in right half of s-plane then

(a) Open loop system is unstable

(b) Close loop system is unstable

(c) Close loop system is unstable for higher gain

(d) Close loop system is stable

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My enquiry is from Bode Plots topic in division Frequency Response Analysis of Control Systems

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Correct answer is (c) Close loop system is unstable for higher gain

Explanation: OLTF contains one zero in right half of s-plane then Close loop system is unstable for higher gain.

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