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Class 4 (4th Engineer) MEKM 📅 Apr 2024

Exam Question

(a) With reference to a 2 stroke slow speed main propulsion engine, sketch a line diagram showing the air starting system (8)

(b) State, with reasons, three safety features incorporated in an air starting system (3)

(c) State with reason why an engine may fail to turnover on air (5)

Exam question diagram

Reference Answer

### (a) Air Starting System for a 2-Stroke Slow Speed Engine
A line diagram of an air starting system illustrates the path of high-pressure air from storage to the engine cylinders to initiate rotation. The system is designed to provide sufficient torque to overcome the engine's static inertia and compression forces, bringing it to a speed where fuel injection can take over for continuous running.
**System Components and Operation:**
1. **Main Air Receivers/Bottles:** Two or more pressure vessels storing compressed air at approximately 30 bar. They are charged by the main air compressors.

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