Question 52General Subjects - Assistant Engineer

70% to pass

What is another name for the control mode used in a process control system that uses two-point control?

AIntegral control
BDerivative control
CProportional control
DOn-off control
AI Explanation

The correct answer is D) On-off control. On-off control, also known as two-point control, is a type of control mode used in process control systems where the controlled variable (e.g., temperature, pressure) is maintained within a specific range by switching the control element (e.g., heater, valve) between two states - on and off. This control mode is characterized by the control element being either fully open or fully closed, with no intermediate positions. The other options are incorrect because they represent different control modes: A) Integral control, B) Derivative control, and C) Proportional control, which have different mechanisms for maintaining the controlled variable within the desired range.

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Official Resources
46 CFR Machinery & Electrical 46 CFR Engineering USCG National Maritime Center
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