Automobile Engineering in ME
The main function of an exhaust muffler is the

Reduction of the exhaust gas volume
Reduction of nitrogen oxide in the exhaust gases
Reduction of exhaust noise
Optimization of exhaust 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

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.
Absorb any difference in speed between the left and right wheels when the vehicle is turning
None of these

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