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Automatic Control Systems

Q1: Consider the following statements
  1. The effect of feedback is to reduce system error
  2. Feedback increases the system gain at one frequency but reduces the system gain as another frequency
  3. Feedback can cause an originally stable system to become unstable
Which of the above statements are correct?

A 1, 2, 3

B 1, 2

C 2, 3

D 1, 3

ANS:D - 1, 3

A feedback system reduces gain as it is formulated a closed loop gain = (Open loop gain)/ (1+Feedback factor*Open loop gain).



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