Automobile Engineering in ME
The purpose of a balancer shaft is to

Adjusts the timing of the intake and exhaust valve openings
Increase inertia force of the rotating crankshaft
Reduce vibrations caused by the crankshaft rotation
Balance the timing in the movement of the two groups of pistons

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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

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
None of these
Absorb the vibrations transferred from the surface of the road

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