Automobile Engineering in ME
The main purpose of an engine's air cleaner is that it

Prevents rain water from entering the engine
Prevents dust and other foreign matter from entering the engine
Reduces the engine's air intake noise
Controls the engine's air intake volume

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Automobile Engineering in ME
An imbalance wheel during vehicle operation

Makes large noise when its heavy point hits the road surface
Bounces vertically or deflects from side to side (as seen from front or rear)
Creates a standing wave
Deflects in the vehicle's longitudinal direction

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