"A control system is unstable, if the open loop frequency response exhibits an amplitude ratio exceeding unity at the crossover frequency." This is _______________ criterion?
Correct answer: A. Bode stability
- A. Bode stability
- B. Nyquist
- C. Routh stability
- D. None of these
Explanation
The Bode stability criterion checks the gain at the phase-crossover frequency: a gain greater than unity indicates instability for the usual negative-feedback case. Nyquist uses encirclements of the critical point rather than this direct amplitude comparison.
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