A control system is unstable, if the open loop frequency response exhi – McqOptions

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1.	A control system is unstable, if the open loop frequency response exhibits an amplitude ratio exceeding unity at the crossover frequency. This is __________ criterion.
A.	Bode stability
B.	Nyquist
C.	Routh stability
D.	None of these
Answer» B. Nyquist

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