What is meant by closed-loop control?

Multiple Choice Questions Automation MCQ
1

Question:

What is meant by “closed-loop control”?

Options:

A) No feedback
B) With feedback
C) Manual mode
D) Fixed output

View Answer

:white_check_mark: Correct Answer: B) With feedback

:magnifying_glass_tilted_right: Detailed Explanation

Closed-loop control is a control system that uses feedback to automatically regulate a process.

In a closed-loop system:

  1. The process variable (PV) is continuously measured.
  2. It is compared with the setpoint (SP).
  3. The controller calculates the error (SP − PV).
  4. Corrective action is applied to reduce the error.

Because the output depends on feedback from the process, the system can automatically correct disturbances.

:cross_mark: Why Other Options Are Incorrect

A) No feedback
This describes open-loop control, not closed-loop.

C) Manual mode
Manual mode bypasses automatic correction; it is not feedback-based control.

D) Fixed output
Fixed output is open-loop behavior and does not adjust based on process conditions.

:fire: Simple Understanding

Closed-loop = “Self-correcting system”
Open-loop = “Blind control system”