Gate EC-2016 – 1 Question Paper With Solutions

Q.30 A closed-loop control system is stable if the Nyquist plot of the corresponding open loop transfer function

(A) encircles the s -plane point (− 1 + j0) in the counterclockwise direction as many times as the number of right-half s -plane poles.

(B) encircles the s -plane point (0 – j1) in the clockwise direction as many times as the number of right-half s -plane poles.

(C) encircles the s -plane point (− 1 + j0) in the counterclockwise
direction as many times as the number of left-half s -plane poles.

(D) encircles the s -plane point (− 1 + j0) in the counterclockwise
direction as many times as the number of right-half s -plane zeros.

Answer: (A)

Explanation:

 

Gate EC-2016 - 1 Question Paper With Solutions

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