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
Compensate for variations in the relative positions of the differential and the wheels which result from bumpy road surfaces or other similar driving conditions.
Absorb the vibrations transferred from the surface of the road

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Automobile Engineering in ME
In a ventilated disc brake

A duct directs air towards the caliper for cooling while the vehicle is moving
Disc contains many small holes for optimum cooling performance
Caliper is covered with cooling fins
Disc contains radial vanes between its rubbing surfaces for optimum cooling performance

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