56. In secondorder systems, the gain margin is a constant at :
(a) zero value
(b) finite value
(c) infinite value
(d) none of these
57. In secondorder systems, the gain margin is a constant at :
(a) zero value
(b) finite value
(c) infinite value
(d) none of these
58. If the splane 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 secondorder system is
G(s) = 20/(s + 1)(s + 10)
(a) 0 dB
(b) 20 dB
(c) ∞ dB
(d) 2 dB
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