46. The Nichols chart can be used to determine :
(a) transient response
(b) time response
(c) closed-loop frequency response
(d) open-loop frequency response
47. Because of the addition of pole to G(s)H(s), the stability of the system is :
(a) improved
(b) reduced
(c) not affected
(d) none of these
48. A point lying inside the closed contour is said to be :
(a) enclosed by it
(b) encircled by it
(c) closed by it
(d) none of these
49. The parameter which is constant along the constant M circle is :
(a) frequency
(b) phase angle
(c) magnitude
(d) open-loop gain
50. The points in the s-plane where the function does not exist are called :
(a) analytic points
(b) singular points
(c) non-existent points
(d) none of these
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