Arizona Driving Permit Written Practice Exam

The purpose of a proportional-integral-derivative (PID) controller is to:

Manually open valves Maintain a process variable exactly at its setpoint by minimizing error Convert pneumatic signals to electronic Provide electrical power to transmitters

Correct Answer:

Maintain a process variable exactly at its setpoint by minimizing error

Explanation:

PID controllers continuously calculate error and adjust outputs to keep processes stable at the setpoint.

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