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A performance index must offer selectivity.

(a) True

(b) False

This question was posed to me in an internship interview.

This interesting question is from Integral Square Error & its Minimization topic in chapter Error Analysis of Control Systems

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Right answer is (a) True

Explanation: It must offer selectivity, that is, an optimal adjustment of parameters must clearly distinguish non optimal adjustment of parameters. If there was no selectivity we would not have been able to distinguish between parameters.

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