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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Stability Theory » Exercise - 252. If the s-plane contour encloses 2 zeros and 2 poles of q(s), the corresponding q(s) plane contour will encircle the origin of q(s) plane : (a) twice in clockwise direction (b) twice in counterclockwise direction (c) zero times (d) four times- Stability Theory » Exercise - 258. 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
- Stability Theory » Exercise - 266. 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
- Stability Theory » Exercise - 255. A polar plot crosses the real axis at (-1 + j0) point. The gain margin of the system is : (a) -1˚ (b) 0˚ (c) -180˚ (d) +180˚
- Stability Theory » Exercise - 265. A polar plot intersects the unit circle at a point making an angle of -45 ˚ with the negative real axis. The phase margin of the system is : (a) -45˚ (b) 45˚ (c) -180˚ - 45˚ (d) -180˚ + 45˚