GATE EC 2015 Set 1 — Question 29
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Control Systems → System Modelling → Feedback Principle
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Question
Negative feedback in a closed-loop control system DOES NOT
Correct answer
(B) reduce bandwidth
Solution
Negative feedback in control systems has several characteristic effects:
1.Reduces Gain: The closed-loop gain is less than the open-loop gain .
2.Increases Bandwidth: The bandwidth increases by the factor .
3.Improves Disturbance Rejection: It reduces the effect of noise and disturbances.
4.Reduces Sensitivity: It makes the system less sensitive to variations in internal parameters.
Since negative feedback increases bandwidth, the statement that it "reduces bandwidth" is incorrect. Therefore, (B) is the correct answer for what it DOES NOT do.Continue learning with Success Tracker
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