Q6.
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
### Part A: Moment Compensator in Large Two-Stroke Engines #### 1. Need for a Moment Compensator Large, slow-speed, two-stroke marine diesel engines, due to their long stroke and heavy reciprocating masses (piston, piston rod, crosshead, and a portion of the connecting rod), generate significant inertia forces. While these forces can be balanced to a degree, they create unbalanced moments that cause the engine to vibrate. * **Primary and Secondary Forces:** The reciprocating motion of the piston assembly creates both primary (once per revolution) and secondary (twice per revolution) inertia forces along the cylinder axis.
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