ITPEC FE Subject A April 2024 Question 4
ITPEC FE Subject A April 2024 — Question 4 of 60
Feedback Control — uses the output to adjust input and keep the system on target.
Feedback control compares the actual output with the target value and adjusts the input to minimize the difference (closed-loop).
Why (b) is correct:
- Feedback control measures the output, compares it with the target, and corrects deviations — keeping the output in line with the target value
Why not others:
- (a) Performing control in a predetermined order describes sequence control, not feedback
- (c) Preventing external disturbances from affecting output describes feedforward control — it acts on disturbances before they reach the output
- (d) Controlling without using the output describes open-loop control — feedback control by definition uses the output
Key rule: Feedback = closed-loop: measure output → compare with target → adjust input.
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