Class 4 (4th Engineer) MEKM 📅 Jul 2022

Exam Question

(a) Mention types of marine diesel engine based on criteria and giving at least four criteria. (8)

(b) Briefly explain the following terms with sketch.

(i) Swept volume. (2)

(ii) Clearance volume. (2)

(iii) Compression ratio. (2)

(iv) Mechanical Efficiency (2)

Reference Answer

### (a) Types of Marine Diesel Engines
Marine diesel engines can be classified based on several criteria. Four key criteria are:
**1. Based on Speed of Operation:**
* **Slow Speed Engines ( 1000 RPM):** These are compact, four-stroke, trunk piston engines. Their applications include auxiliary power generation (gensets), emergency generators, propulsion for high-speed craft, and powering lifeboats.

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