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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