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

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

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Control Systems
When deriving the transfer function of linear element

 initial conditions are assumed to be zero and the element is assumed to be not loaded.
 both initial conditions and loading are taken into account.
 initial conditions are assumed to be zero but loading is taken into account.
 initial conditions are taken into account but the element is assumed to be not loaded.

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