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Exam Questions Papers - Engineering

Q1:

The characteristic equation of a feedback control system is given by s3 + 5s2 + (K + 6)s + K = 0
where K > 0 is a scalar variable parameter. In the root-loci diagram of the system the asymptotes of the root-locus for large values of K meet at a point in the s-plane, whose coordinates are :

A (- 3, 0)

B (- 2, 0)

C (- 1, 0)

D (2, 0)

ANS:C - (- 1, 0)

Apply R-H, and find ω by auxiliary equation.