# Electrical Engineering: Control system MCQ

##### 11. Question

Given the following polynomial equation

s^{3}+5.5s^{2}+8.5s+3=0

the number of roots of the polynomial, which have real parts strictly less than −1, is ________ .

Answer

##### 12. Question

Loop transfer function of a feedback system is G ( s ) H ( s ) = (s+3) s^{2}(s-3). Take the Nyquist contour in the clockwise direction. Then, the Nyquist plot of G ( s ) H ( s ) encircles -1 + j 0

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##### 13. Question

Consider a continuous-time system with input x(t) and output y (t) given by

y(t) = x(t) cos(t)

this system is

Answer

##### 14. Question

If Cis a circle |z| = 4 and f (z) = Z^{2}/(Z^{2}-3Z+2)^{2} , then is

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##### 15. Question

The number of roots of the polynomial, s 7 + s 6 + 7s 5 + 14s 4 + 31s 3 + 73s 2 + 25s + 200,in the open left half of the complex plane is

Answer