Control Systems
The characteristic equation of a feedback control system is given by s³ + 5s² + (k + 6)s + k = 0. In the root loci diagram, the asymptotes of the root loci for large 'k' meet at a point in the s-plane whose coordinates are

 (2,0)
 (-1,0)
 (1,0)
 (-2,0)

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

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