Control Systems
A function y (t) satisfies the following differential equation : Where, δ (t) is the delta function. Assuming zero initial condition and denoting the unit step function by u(t), y(t) can be formed as

 e-t.
 et.
 e-tu(t).
 etu(t).

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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 and 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.

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