The main causes of crankshaft vibration are _________
(a) Variation in torque
(b) Cyclic variation of gas and combustion products
(c) Unbalanced weight of parts
(d) All of the mentioned
This question was posed to me by my school principal while I was bunking the class.
This key question is from IC Engine Crankshaft and Camshaft topic in division Internal Combustion Engines of Automobile Engineering