Control Systems
The output of the system has an effect upon the input quantity, then the system is a

 open loop control system.
 either 1 or 2.
 closed loop control system.
None of these

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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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