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Stability Theory – 2 – 3

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

Answer
Answer : (c)

Explanation
No answer description available for this question. Let us discuss.

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

Answer
Answer : (c)

Explanation
No answer description available for this question. Let us discuss.

63. In q(s)-plane the Nyquist plot is symmetrical about the :

(a) imaginary axis
(b) real axis
(c) origin
(d) none of these

Answer
Answer : (b)

Explanation
No answer description available for this question. Let us discuss.

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

Answer
Answer : (a)

Explanation
No answer description available for this question. Let us discuss.

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˚

Answer
Answer : (b)

Explanation
No answer description available for this question. Let us discuss.

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