Control Systems
A transfer function has a zero at s = -1 and poles at s = -1 ± j1. The multiplier being unity, if the input is step function, the steady state response is given by

 0.5∠0°
 0.5∠10°
 1∠0°
 2∠90°

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

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