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# Stability Theory – 2 – 2

56. In second-order systems, the gain margin is a constant at :

(a) zero value
(b) finite value
(c) infinite value
(d) none of these

Explanation
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57. In second-order systems, the gain margin is a constant at :

(a) zero value
(b) finite value
(c) infinite value
(d) none of these

Explanation
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58. If the s-plane contour encloses 3 poles and 2 zeros of q(s), the corresponding q(s) plane contour will encircle the origin of q(s) plane :

(a) once in clockwise direction
(b) once in counterclockwise direction
(c) thrice in clockwise direction
(d) twice in counterclockwise direction

Explanation
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59. A point or region lying to the right of the path of traversal when the closed contour is traversed in the clockwise direction is said to be :

(a) enclosed by it
(b) encircled by it
(c) closed by it
(d) none of these

Explanation
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60. The open – loop transfer function of a second-order system is

G(s) = 20/(s + 1)(s + 10)

(a) 0 dB
(b) 20 dB
(c) ∞ dB
(d) 2 dB