← MeoMock / Written exams
Class 4 (4th Engineer) MEKM 📅 Aug 2024

Exam Question

An auxiliary engine under load continuously fluctuates even with a steady load. (16)

The fault you diagnose could be owing to

(a) the quality of fuel

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

(c) The supply of charge air

(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.

Exam question diagram

Reference Answer

### Analysis of Auxiliary Engine Speed Fluctuation (Hunting)
The continuous fluctuation of an auxiliary engine's speed under a steady load is a condition known as 'hunting'. This indicates an instability in the speed control system. The governor is unable to find a stable fuel rack position corresponding to the set speed and load, resulting in a continuous oscillation of RPM. Below is an analysis of the potential causes provided.
---
#### (a) The quality of fuel

Full answer on MeoMock — surveyor-grade reference answers for 7,000+ written exam questions.

View plans Browse library

← Browse more questions

Prepare on Android — MeoMock on Google Play