Exam Question
With regards to process control system explain following: (16)
(a) Proportional Control
(b) integral Control
(c) Derivative Control
(d) The necessity of Derivative control
Class 2 (2nd Engineer)
MEKG
📅 Jul 2025
Reference Answer
### Process Control Systems: P, I, and D Actions
Process control systems are fundamental to the safe and efficient operation of a ship's machinery. They automatically maintain a desired process variable (PV) at a specific set point (SP). The controller achieves this by calculating an error signal (e = SP - PV) and producing an output to a final control element (e.g., a valve). The most common control strategy combines Proportional (P), Integral (I), and Derivative (D) actions.
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### (a) Proportional Control (P-Action)
Process control systems are fundamental to the safe and efficient operation of a ship's machinery. They automatically maintain a desired process variable (PV) at a specific set point (SP). The controller achieves this by calculating an error signal (e = SP - PV) and producing an output to a final control element (e.g., a valve). The most common control strategy combines Proportional (P), Integral (I), and Derivative (D) actions.
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### (a) Proportional Control (P-Action)
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