Control Systems
Which of the following statements is/are true?

 Centroid may be a part of root locus
 Centroid may not be a part of root locus
 both 1 and 2
 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 o/p decreases and speed changer position comes down.
 integrator o/p increases but speed changer position comes down.
  integrator output and speed changer position attain a constant value.

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