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

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

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Automobile Engineering in ME
The main task of a battery in automobiles is to

Supply electricity to the alternator
Supply electricity to the vehicle's electrical system at all times while the engine is running
Act as a reservoir or stabilizer of electricity
Supply a large amount of power to turn the starter motor when the engine is being started

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Automobile Engineering in ME
The basic purpose of a four wheel drive (4WD) system is that it

Ensures effective transmission of engine torque to all four wheels, even on slippery road surfaces
Delivers improved cornering on dry road surfaces
Eliminates the need of snow tyres, tyre chains, etc.
Ensures that effective braking can be performed, even on slippery surfaces

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