Automobile Engineering in ME
The rolling resistance is because of the friction between the

Wheel rim and tyre
Wheel rim and road surface
Tyre and the road surface
None of the listed here

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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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