Question

A first order system with a proportional controller exhibits an offset to step input. The offset can be reduced by:

• A. increasing the gain
• B. adding integral mode
• C. adding derivative mode
• D. decreasing the gain

Hint:

To eliminate steady-state error (offset), add integral action in the controller.

Answer 1

The Correct Option is B

A proportional controller alone cannot eliminate steady-state error (offset) for a step input. Adding an integral component introduces an accumulating term that forces the error to zero over time, effectively removing the offset.