Control Systems
The unit impulse response of second order system is 1/6 * e-0.8t sin(0.6t). THen the natural frequency is

 2 rad/s
 0.8 rad/s
 0.6 rad/s
 1 rad/s

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Control Systems
In the integral control of the single area system frequency error is reduced to zero. Then

  integrator output and speed changer position attain a constant value.
 integrator o/p decreases but speed changer position moves up.
 integrator o/p increases but speed changer position comes down.
 integrator o/p decreases and speed changer position comes down.

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