A closed-loop control system typically works best because it can respond to disturbances by adjusting its output.

• A. True
• B. False
• C. Sometimes
• D. Not

Answer: (A)

Closed-loop control uses feedback to keep the output at the desired value. When a disturbance pushes the process away, the sensor measures the actual output, the controller computes the needed correction, and the actuator adjusts the output to counter the disturbance. This feedback action continuously reduces the difference between the setpoint and the actual output, giving the system robustness against disturbances. That’s why the statement is true: closed-loop systems typically respond to disturbances by adjusting their output to restore the desired behavior. Keep in mind that real systems may face issues like sensor noise or stability concerns if not properly designed, but the core benefit is disturbance rejection through feedback.