How does proportional controller generate its output?

Multiple Choice Questions Automation MCQ
1

Question:

How does a proportional controller generate its output?

Options:

A) From error rate
B) From error sum
C) From error value
D) From SP only

View Answer

:white_check_mark: Correct Answer: C) From error value

:magnifying_glass_tilted_right: Detailed Explanation

A proportional controller generates its output directly from the current error value.

image

Where:

  • ( Kp ) = proportional gain
  • ( e(t) = SP - PV )

This means:

  • Larger error → Larger output
  • Smaller error → Smaller output
  • Zero error → Zero proportional contribution

Proportional action reacts instantly to present deviation.

:repeat_button: What It Does NOT Use

  • It does not use the rate of change (that is derivative).
  • It does not use the accumulated error (that is integral).
  • It does not depend on SP alone.

:cross_mark: Why Other Options Are Incorrect

A) From error rate → That describes derivative action.
B) From error sum → That describes integral action.
D) From SP only → Output depends on the difference between SP and PV, not SP alone.