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Routh Hurwitz criterion cannot be applied when the characteristic equation of the system containing coefficient’s which is/are

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Routh Hurwitz criterion cannot be applied when the characteristic equation of the system containing coefficient’s which is/are

(a) Exponential function of s

(b) Sinusoidal function of s

(c) Complex

(d) Exponential and sinusoidal function of s and complex

I got this question in an online interview.

My query is from Routh-Hurwitz Stability Criterion in portion Stability and Algebraic Criteria of Control Systems

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Correct option is (d) Exponential and sinusoidal function of s and complex

Easy explanation: Routh Hurwitz criterion cannot be applied when the characteristic equation of the system containing coefficient/s which is/are exponential, sinusoidal and complex function of s.

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