Exam Question
With reference to control system state what is meant by:
(a) Two step action (6)
(b) Proportional control (5)
(c) Offset (5)
Class 4 (4th Engineer)
MEKG
📅 Jan 2024
Reference Answer
### (a) Two-step action (On-Off Control)
**Concept:**
Two-step action, often referred to as On-Off control, is the simplest and most rudimentary form of feedback control. In this system, the controller's output can only exist in two discrete states: either fully ON or fully OFF (e.g., fully open or fully closed for a valve, or energized/de-energized for a pump/heater). There is no intermediate or partial control action.
**Principle of Operation:**
**Concept:**
Two-step action, often referred to as On-Off control, is the simplest and most rudimentary form of feedback control. In this system, the controller's output can only exist in two discrete states: either fully ON or fully OFF (e.g., fully open or fully closed for a valve, or energized/de-energized for a pump/heater). There is no intermediate or partial control action.
**Principle of Operation:**
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