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

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

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Automobile Engineering in ME
The drive-shafts are connected to the differential and wheel hubs through universal joints because the universal joints

None of these
Absorb any difference in speed between the left and right wheels when the vehicle is turning
Absorb the vibrations transferred from the surface of the road
Compensate for variations in the relative positions of the differential and the wheels which result from bumpy road surfaces or other similar driving conditions.

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Automobile Engineering in ME
Incorrect steering axis inclination (S.A.I.) causes

The vehicle to pull to the side of lesser inclination
Poor recovery of the steering wheel after making a turn
Tendency to assume toe-out orientation
Generation of a braking effect at tight corners

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