Electrician Red Seal · Question
Which of the following best describes the primary function of a Proportional-Integral-Derivative (PID) controller in an industrial process?
A PID controller is designed to precisely maintain a process variable at a desired setpoint by continuously calculating and adjusting an output based on the err
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Question: Which of the following best describes the primary function of a Proportional-Integral-Derivative (PID) controller in an industrial process?
Answer options:
- To switch an output ON or OFF based on a single setpoint comparison.
- To linearly scale an analog input signal to a specific range. ✅ To precisely maintain a process variable at a desired setpoint by continuously adjusting an output.
- To sequence a series of discrete operations in a fixed order.
Correct answer: To precisely maintain a process variable at a desired setpoint by continuously adjusting an output.
Explanation: A PID controller is designed to precisely maintain a process variable at a desired setpoint by continuously calculating and adjusting an output based on the error between the setpoint and the measured value, and considering present, past, and future error. Switching ON/OFF is typical of a simple on/off control, scaling is for signal conditioning, and sequencing is for discrete control.
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