Control Systems
A transfer function has its zero in the right half of the s-plane. The function

 is positive real
 is non-minimum phase
 will give stable impulse response
 is minimum phase

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

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