11. The root locus always starts at the :
(a) open-loop poles
(b) open-loop zeros
(c) closed-loop poles
(d) closed-loop zeros
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
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
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
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
Related Posts
Stability Theory » Exercise - 140. The open-loop transfer function of a unity feedback control system is G(s)H(s) = 225/(S( s+2)(s +T)) Where T is a variable parameter The closed-loop system will be stable for all values of (a) T > 0 (b) 0 < K < 00 (c) >11 (d) positive- Stability Theory » Exercise - 128. The number of sign changes in the elements of the first column of the Routh array denotes : (a) the number of zeros of the closed-loop system in the RHP (b) the number of poles of the closed-loop system in the RHP (c) the number of open-loop zeros in RHP (d) the number of open-loop poles in RHP
- Stability Theory » Exercise - 142. The open-loop transfer function of a control system is given by G(s) = (K(s+8))/(S( s+4)(s+a)) The smallest possible value of a for which the system is stable in the closed-loop for all positive value of K is : (a) 0 (b) 4 (c) 8 (d) 12
- Time Domain Analysis » Exercise - 111. For a stable second –order underdamped system, the poles are : (a) Purely imaginary (b) complex conjugate of each other (c) real and unequal (d) real and unequal
- Stability Theory » Exercise - 136. The characteristic equation of a unity feedback system is given by s3 + s2+ 2s + 2 = 0 (a) The system has one pole in the RH of the s-plane (b) The system has two poles in the RH of the s-plane (c) The system is asymptotically stable (d) The system exhibits oscillatory response