Exam Question
With reference to control system, explain in brief:
(a) Two step action.
(b) Proportional Control
(c) Offset
Class 4 (4th Engineer)
MEKG
📅 Sep 2024
Reference Answer
### (a) Two-Step (On/Off) Control Action
Two-step action, also known as ON/OFF or two-position control, is the simplest mode of automatic control. The controller's output has only two possible states, corresponding to the extremes of the final control element's operating range (e.g., fully open or fully closed, fully on or fully off).
**1. Principle of Operation:**
* The controller continuously compares the measured Process Variable (PV) with the desired Setpoint (SP).
Two-step action, also known as ON/OFF or two-position control, is the simplest mode of automatic control. The controller's output has only two possible states, corresponding to the extremes of the final control element's operating range (e.g., fully open or fully closed, fully on or fully off).
**1. Principle of Operation:**
* The controller continuously compares the measured Process Variable (PV) with the desired Setpoint (SP).
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