Automobile Engineering in ME
The basic purpose of providing caster angle on wheels is to

Maintain directional control
Prevent uneven tyre wear
Compensate for wear in the steering linkage
Bring the road contact of the tyre under the point of load

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Automobile Engineering in ME
The function of a radiator fan in the cooling system is that

It cools the engine by blowing air onto the cylinder block
It is turned by wind force as the vehicle moves forward, and its rotation drives the water pump
It blows air through the radiator when necessary
It draws heat out of the engine compartment

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