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

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 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
None of these

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Automobile Engineering in ME
The rigid suspension is beneficial when

It is desired to have more flexibility in design
It is desired to reduce the unsprung mass
Large changes in load make it necessary to have a large suspension stroke
It is desired to improve tyre to ground contact characteristics

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