Discussion
Following are the controllers :
1. On-off
2. PID
3. PI
The correct order of the decrease in error output is
Answer: B
The error is largest with the on-off controller, smaller with the PI controller, and smallest with the PID controller, so the order of decreasing error is 1, 3, 2 (option B). On-off control causes a cycling about the set point, the integral action in PI removes the steady-state offset, and the derivative action in PID also improves the response.
Options A, C and D place PID or PI ahead of the on-off controller, which would mean the more refined controller has the larger error.
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