Process Control and Instrumentation
In second order underdamped system,

Decay ratio = overshoot
Decay ratio = (overshoot)²
Large damping co-efficient means smaller damping
Overshoot increases for increasing damping co-efficient

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

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
Time required for the response of first reach its ultimate value is called the response time

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