Control Systems
Which system is also known as automatic control system?

 Either 1 or 2
 Closed loop control system
 Open loop control system
 Nether 1 nor 2

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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 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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