Which description matches feed-forward proportional control?

Which description matches feed-forward proportional control?

• A. It measures the output of the process and reacts backwards to adjust operation.
• B. It involves limited operator intervention.
• C. It measures a variable and adjusts the equipment proportionally.
• D. It starts the motor with no feedback.

Answer: (C)

Feed-forward proportional control uses a measured variable to drive the actuator in proportion to that signal, aiming to counteract disturbances before they affect the process output. The action is proportional to the measured variable, and it does not rely on measuring the process output and reacting to its error. That makes the description of measuring a variable and adjusting the equipment proportionally the best fit. It isn’t simply starting a motor with no feedback (open-loop) and it isn’t about limited operator intervention, which would describe different control aspects.

Feed-forward proportional control uses a measured variable to drive the actuator in proportion to that signal, aiming to counteract disturbances before they affect the process output. The action is proportional to the measured variable, and it does not rely on measuring the process output and reacting to its error. That makes the description of measuring a variable and adjusting the equipment proportionally the best fit. It isn’t simply starting a motor with no feedback (open-loop) and it isn’t about limited operator intervention, which would describe different control aspects.