Class 4 (4th Engineer) MEKM 📅 Oct 2023

Exam Question

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

(a) How it can be stopped? (6)

(b) What is likely to be the reasons for the failure? (4)

(с) Give details of what checks are made after the engine has been stopped, both regard to (6)

(i) Mechanical checks and

(ii) Electrical checks

Reference Answer

### (a) How the Runaway Auxiliary Generator Can Be Stopped (6 Marks)
A runaway engine is an extremely dangerous situation due to the high centrifugal and inertia forces generated, which can lead to catastrophic mechanical failure. The primary objective is to stop the engine safely and quickly by cutting off its fuel supply. The following methods, in order of preference and safety, should be employed:
1. **Local Manual Fuel Rack Trip:**
* **Action:** If it is deemed safe to approach the engine, the operator should immediately attempt to manually pull the fuel pump rack to the 'zero' or 'no fuel' position. This is the most direct method to stop fuel injection.

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