Class 2 (2nd Engineer) MEKM 📅 Apr 2025

Exam Question

(a) Explain the need for a moment compensator in large two-stroke marine engines. With the help of a neat sketch, describe the construction and working principle of a moment compensator. (10)

(b) Discuss the consequences of failure or incorrect functioning of the moment compensator in a two-stroke engine. What checks and maintenance practices are recommended to ensure its reliability? (6)

Reference Answer

(a) Need for a Moment Compensator in Large Two-Stroke Marine Engines
Large slow-speed two-stroke marine engines have very long strokes, which produce high inertia forces due to rapid acceleration and deceleration of the pistons.
The most problematic among these are 2nd-order vertical inertia forces , which vary with the square of engine speed. These forces:
Create strong vertical shaking moments,

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