Control Systems
Angle condition for complimentary root locus or inverse root locus is

 ± (2q) 360°
 ± (2q + 1) 180°
 ± (2q) 180°
 ± (2q + 1) 360°

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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 and speed changer position comes down.
  integrator output and speed changer position attain a constant value.
 integrator o/p decreases but speed changer position moves up.
 integrator o/p increases but speed changer position comes down.

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