Process Control and Instrumentation
A control system is unstable, if the open loop frequency response exhibits an amplitude ratio exceeding unity at the crossover frequency. This is __________ criterion.

Bode stability
None of these
Routh stability
Nyquist

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Process Control and Instrumentation
In a second order under damped system, the

Time required for the response of first reach its ultimate value is called the response time
None of these
Overshoot (which is a measure of how much the response exceeds the ultimate value) increase with the decrease of damping co-efficient e
Decay ratio (which is the ratio of the sizes of successive peaks) is equal to the reciprocal of overshoot

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