ISRO EC 2018:Control System Booster Quiz 2

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Question 1

A unity feedback system, having an open loop gain G(s)H(s) = . The system stable when –

• A|K| > 1
• BK > 1
• Ck < -1
• D|k| < 1

Question 2

What is the open loop DC gain of a unity feedback control system having closed loop transfer function is (s + 4)/(s ² + 7s +13) ?

• A0.333
• B0.444
• C0.555
• D0.666

Question 3

What is the magnitude of an open-loop transfer function at the point of gain cross-over frequency on its polar plot?

• A
• B
• C
• D

Question 4

At which point the bode plot of the given transfer function intersects with the 0 db axis? (find w in radian/sec)
 

• A2.514
• B4.514
• C3.162
• D5.514

Question 5

Find the transfer function for the given block diagram?

• A
• B
• C
• DNone of these

Question 6

Which of the following block diagram is equivalent to the given block diagram?

• A
• B
• C
• D

Question 7

Determine the transfer function of the system represented by the given signal flow graph.

• A
• B
• C
• D

Question 8

Which of the following statements is/are true:
1) the effect of feedback is to reduce the steady state error steeply.
2) Negative Feedback decreases the gain of the system.
Which of these statements are correct.

• A1 and 2
• B1
• C2
• DNone

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