Exam Question
With reference to control system, explain in brief:
(a) Two step action (6)
(b) Proportional control (5)
(c) Offset (5)
Class 4 (4th Engineer)
MEKG
📅 Mar 2026
Reference Answer
### (a) Two-Step Action (On/Off Control)
Two-step action, also known as ON/OFF or two-position control, is the simplest mode of automatic control where the final control element is moved between one of two fixed positions, typically fully ON or fully OFF.
**1. Principle of Operation:**
* The controller compares the measured Process Variable (PV) with a desired Setpoint (SP).
Two-step action, also known as ON/OFF or two-position control, is the simplest mode of automatic control where the final control element is moved between one of two fixed positions, typically fully ON or fully OFF.
**1. Principle of Operation:**
* The controller compares the measured Process Variable (PV) with a desired Setpoint (SP).
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