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ESE : Control Systems Champion Quiz 3

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Question 1

The open loop transfer function of a unity negative feedback control system is given by .
Which is the value of K which causes sustained oscillations in the closed loop system?

Question 2

The characteristic equation of a control system is

What are the number of roots of the equation which lie to the left of the line

Question 3

Consider the following statements with respect to feedback control system.
1) Accuracy cannot be obtained by adjusting loop gain.
2) Feedback decreases overall gain.
3) Introduction of noise due to sensor reduces overall accuracy.
4) Introduction of feedback may lead to the possibility of instability of closed loop system.
Which of the statements given above are correct?

Question 4

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.

Question 5

For the system given below, the feedback does not reduce the closed loop sensitivity due to variation of which one of the following.

Question 6

The characteristic polynomial of a system is

Which one of the following is correct? The system is

Question 7

The open loop transfer function of a unity feedback control system is

Which is the value of K for its stable operation?

Question 8

Consider the unity feedback system with
The system is marginally stable. What is the radian frequency of oscillation?

Question 9

A closed loop system is shown in the below figure. What is the ratio of output frequencies

Question 10

Which of the following may result in instability problem?
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