Control Systems
Time constant is defined as the time taken by the response of the system to reach ----------- ?

 50% of the final value
 63% of the final value
 70.7% of the final value
 100% of the final value

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

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