Stability Theory – 2 – 4

66. If the s-plane contour encloses 3 zeros and 2 poles 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

67. A polar plot interscets the unit circle at (-1 = j0). The gain margin of the system is :

(a) -1 dB
(b) 0 dB
(c) ∞ dB
(d) 2 dB

68. As the polar plot gets closer to the (-1 + j0) point, the stability of the system is :

(a) improved
(b) reduced
(c) not affected
(d) none of these

1 2 3 4

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