Class 2 (2nd Engineer) MEKM 📅 Nov 2024

Exam Question

Discuss the nature of the forces to which a main engine crankshaft is subjected in normal service and explain how the resulting stress are maintained at a safe limit by design and efficient maintenance respectively. Indicate the circumstances under which the crankshaft may (16)

(a) Over stressed,

(b) Become defective without being over stressed.

Reference Answer

Forces Acting on a Crankshaft in Normal Service
Inertia Forces :
These forces act on both the rotating and reciprocating masses of the engine.
For rotating masses, the inertia forces are constant in magnitude but change direction with rotation.

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