What occurs when proportional gain is extremely low?

Multiple Choice Questions Automation MCQ
1

Question:

What occurs when proportional gain is extremely low?

Options:

A) Loop oscillates
B) High overshoot
C) Sluggish response
D) Fast settling

View Answer

:white_check_mark: Correct Answer: C) Sluggish response

:magnifying_glass_tilted_right: Detailed Explanation

Proportional gain (Kp) determines how strongly the controller reacts to error.

When Kp is extremely low:

  • Output changes are very small
  • Controller reacts weakly to disturbances
  • Process variable moves slowly toward setpoint
  • Rise time increases

This results in a sluggish response.

:repeat_button: Practical Behavior

Low Kp leads to:

  • Slow correction
  • Long settling time
  • Larger steady-state offset (if no integral action)

:cross_mark: Why Other Options Are Incorrect

A) Loop oscillates ā†’ Oscillation usually occurs when Kp is too high.
B) High overshoot ā†’ High gain causes overshoot, not low gain.
D) Fast settling ā†’ Low gain increases settling time, not reduces it.