Exam Question
Explain the meaning of the following terms with reference to automatic control system:
(a) Control loop (4)
(b) Transmitter (4)
(c) Controller (4)
(d) Desired value (4)
Class 4 (4th Engineer)
MET
📅 Dec 2022
Reference Answer
### (a) Control Loop
A control loop, specifically a closed-loop feedback control system, is an arrangement of components designed to automatically maintain a process variable at a desired value or setpoint. The system continuously measures the current state of the variable, compares it to the desired value, and makes corrective actions to minimize the difference (error).
**Core Components of a Control Loop:**
1. **Process Variable (PV):** The physical quantity to be controlled (e.g., temperature, pressure, level).
A control loop, specifically a closed-loop feedback control system, is an arrangement of components designed to automatically maintain a process variable at a desired value or setpoint. The system continuously measures the current state of the variable, compares it to the desired value, and makes corrective actions to minimize the difference (error).
**Core Components of a Control Loop:**
1. **Process Variable (PV):** The physical quantity to be controlled (e.g., temperature, pressure, level).
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