Class 4 (4th Engineer) MEKM 📅 May 2024

Exam Question

An auxiliary engine under load continuously fluctuates even with a steady load. The fault you diagnose could be owing to: (16)

(a) The quality of fuel

(b) The quality of servicing of the governor in the last port

(d) The overhaul of fuel injectors done in the last decarbonisation

Give a brief explanation as to why each of the above mentioned points either could be true or cannot at all be the reasons for such a fluctuation.

Reference Answer

### Analysis of Engine RPM Fluctuation
The continuous fluctuation of an auxiliary engine's speed under a steady load is a condition known as 'hunting'. This indicates a fault in the engine's speed control system or a variable input that mimics a change in load. Each potential cause must be evaluated based on its ability to create a cyclical, rhythmic variation in engine power output.
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#### (a) The quality of fuel

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