Class 2 (2nd Engineer) MEKM 📅 Mar 2023

Exam Question

(a) Discuss the principal forces a large diesel engine crankshaft must withstand while in service and how the stresses resulting from these forces are kept within acceptable limits by good design and operation criteria; (8)

(b) Discuss the manner in which the crankshaft may be overstressed and the consequences arising there from. (8)

Reference Answer

(a) Nature of Forces Acting on a Main Engine Crankshaft
The crankshaft is the component that converts the reciprocating motion of the piston into rotary motion. In service, it is subjected to the following forces:
1. Gas Forces
Arising from compression of air and combustion of fuel.

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