61. All the constant N circles pass through :
(a) only origin
(b) only (-1 +j0) point
(c) both origin and (-1 = j0) point
(d) none of these
62. The Nyquist plot intersects the real axis at –a = -0.02, the gain margin is :
(a) -0.02
(b) +0.02
(c) 50
(d) cannot be estimated
63. In q(s)-plane the Nyquist plot is symmetrical about the :
(a) imaginary axis
(b) real axis
(c) origin
(d) none of these
64. The Nyquist plot inter the real axis at –a = -2, the gain margin is :
(a) 2
(b) 1/2
(c) -2
(d) cannot be estimated
65. 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˚
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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˚