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

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

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Automobile Engineering in ME
A worm gear is used as the pinion for the rack and pinion type of steering gearbox, because it

Improves steering comfort when steering wheel is turned to effect small changes in the direction of forward motion
Reduces the amount of kickback for large steering angles
Makes the steering more responsive
Allows the steering wheel to be turned by a greater amount when steering

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