Control Systems
A proportional plus derivative controller

 improves the steady state accuracy
 both 1 and 2
 increases the stability of the system
 has high sensitivity

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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 and speed changer position comes down.
 integrator o/p increases but speed changer position comes down.
 integrator o/p decreases but speed changer position moves up.

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