Class 4 (4th Engineer) MEKM 📅 Jun 2025

Exam Question

With respect to marine applications:

(a) What are the different types of lubrication system that you would see on the main and auxiliary machineries? (8)

(b) What are the desirable qualities for the lubricating oil selected for each of the following duties: (8)

(i) auxiliary diesel engine

(ii) stern tube bearings

(iii) refrigeration system

(iv) turbocharger

Reference Answer

### Part (a): Types of Lubrication Systems in Marine Applications
Based on the principle of lubrication, systems found on board can be categorized as follows. These principles are applied within broader practical systems like force-feed, splash, and timed injection systems.
1. **Hydrodynamic Lubrication**
* **Concept:** This is the most desirable form of lubrication where the moving surfaces are completely separated by a continuous, self-sustaining film of lubricating oil. The film pressure is generated by the relative motion of the surfaces themselves.

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