Class 4 (4th Engineer) MEKM 📅 Sep 2025

Exam Question

(a) Sketch and describe the significance of Chocks ? Give the three different types of chocks fitted in marine diesel engines. Briefly describe the purpose of each. (8)

(b) What are the different classification of chocks based on its material? (4)

Reference Answer

### (a) Sketch, Significance, and Types of Chocks
**Significance of Chocks**
Chocks are critical structural components that form the interface between a marine engine's bedplate and the ship's foundation (tank top or engine room girders). Their primary significance lies in maintaining the precise and permanent alignment of the engine's crankshaft with the propeller shafting or alternator. This alignment is paramount for the efficient and reliable transmission of power.
The key functions and significance include:

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