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Stability Theory – 1 – 3

11. The root locus always starts at the :

(a) open-loop poles
(b) open-loop zeros
(c) closed-loop poles
(d) closed-loop zeros

Explanation
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12. Angles of asymptotes are measured at the centroid with respect to :

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

Explanation
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13. The angle of arrival at a real zero is always :

(a) 0°
(b) 180°
(c) either 0° or 180°
(d) to be calculated for each problem

Explanation
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14. The roots of the characteristic equation are the same as :

(a) open-loop poles
(b) open-loop zeros
(c) closed-loop poles
(d) closed-loop zeros

Explanation
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15. An open-loop transfer function has 4 poles and 1 zero. The number of branches of root locus is :

(a) 4
(b) 1
(c) 5
(d) 3