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Class 4 (4th Engineer) MEKM 📅 Dec 2024

Exam Question

If an auxiliary diesel generator over speeds while off load, explain:

(a) How can the engine be stopped? (6)

(b) What are the probable reasons for the failure? (4)

(c) Give details of the checks that are required to be made after the engine has been stopped, with regard to: (6)

(i) Mechanical checks and;

(ii) Electrical checks

Reference Answer

When an auxiliary diesel generator overspeeds while off-load, it indicates a critical failure in the engine's speed control mechanism, primarily the governor and fuel injection system. Immediate and decisive action is required to prevent catastrophic engine damage. A systematic approach to stopping the engine and subsequent investigation is paramount.
### (a) How can the engine be stopped?
Stopping an overspeeding diesel engine requires rapidly cutting off its fuel supply or its air supply. The sequence and method depend on the engine design and the urgency of the situation.
* **Manual Fuel Rack Shutdown:**

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