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

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

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

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

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

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