Control Systems
The open loop transfer function of a unity feedback control system is given by G(s) = k/s(s+1). If the gain k is increased to infinity, then damping ratio will tend to become

 zero
 0.707
 infinite
 unity

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

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

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