Automobile Engineering in ME
The advantage of the fuel injection system over the carburettor system is

Improved power output
Improved emission
All of the listed here
Improved fuel efficiency

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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 the vibrations transferred from the surface of the road
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.

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