21. Break points can be :

(a) only real

(b) only complex

(c) real or complex

(d) none of these

22. The root locus can be used to determine :

(a) the absolute stability of a system

(b) the relative stability of a system

(c) both absolute and relative stabilities of a system

(d) none of these

23. Asymptotes can intersect :

(a) only on the negative real axis

(b) only on the positive real axis

(c) any where on the real axis

(d) none of these

24. The angle of departure from a real pole is always :

(a) 0°

(b) 180°

(c) either 0° or 180°

(d) to be calculated for each problem

25. The locus locus gives terminates on the :

(a) open-loop zeros

(b) closed-loop zeros

(c) both of the characteristic equation

(d) none of these

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