Feedback MCQs

Practice Feedback MCQs with four options, answers and explanations for focused Electronics & Telecommunication Engineering revision.

Question 1

Control SystemsFeedback

Which is a common advantage of negative feedback in a control system?

AReduced sensitivity to parameter variations
BInfinite output for every input
CElimination of all components
DGuaranteed zero error for every system

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Correct Answer: A. Reduced sensitivity to parameter variations

Explanation: Negative feedback generally reduces sensitivity to plant parameter variations and can improve accuracy and robustness when properly designed.

Reference: Standard control systems: feedback

Question 2

Control SystemsFeedback

In a standard negative-feedback system, the error signal is commonly?

AReference minus feedback signal
BReference plus feedback signal always
COutput multiplied by input
DFeedback divided by reference

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Correct Answer: A. Reference minus feedback signal

Explanation: At the summing junction of a standard negative-feedback loop, e(t)=r(t)-b(t).

Reference: Standard control systems: feedback

Question 3

Control SystemsFeedback

For unity negative feedback, H(s) is equal to?

A0
B1
CG(s)
Ds

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Correct Answer: B. 1

Explanation: Unity feedback means the feedback transfer function is H(s)=1.

Reference: Standard control systems: feedback