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Vizag Steel Re-Exam: Quiz 2

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Question 1

A linear time-invariant system initially at rest, when subjected to a unit-step input, gives a response

y(t)= t.e^-t, t>0. The transfer function of the system is:

Question 2

In case of DC servo-motor the back-emf is equivalent to an “electric friction” which tends to.

Question 3

Statement(I): The phase angle plot in Bode diagram is not affected by the variation in open loop gain of the system.
Statement(II): The variation in gain of the system has no effect on the phase margin.

Question 4

Match List-I (Frequency Response) with List-II (Time Response) and select the correct answer using the code given below the lists:
List-I
A) Bandwidth
B) Phase margin
C) Response peak
D) Gain margin
List-II
1) Overshoot
2) Stability
3) Speed of time response
4) Damping ratio

Question 5

Statement (I): Root loci are symmetrical with respect to real axis of the s-plane.
Statement (II): Root loci are normally symmetrical with respect to the perpendicular axis of symmetry of the pole-zero combination of the loop transfer function.

Question 6

Which of the following may result in instability problem?

Question 7

Assertion (A): The closed loop stability can be determined from the poles of an open loop system and the polar plot of frequency response.
Reason(R): Unstable system has right half poles.