Q. The main cause of crankshaft vibration are

A
Variation in torque
B
Cyclic variation of gas and combustion products
C
Unbalanced weight of parts
D
All of these
Solution:

The crankshaft coverts to and fro motion of piston into rotation motion. It is exposed to high vibrations due to torque variation,cyclic variation of gas and combustion products,unbalanced weight in engine.

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