Automobile Engineering in ME
The heat transfer from coolant to air in the radiator of an automobile engine takes place by

Convention only
Radiation only
Conduction, convection and radiation
Convection and radiation

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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 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
Compensate for variations in the relative positions of the differential and the wheels which result from bumpy road surfaces or other similar driving conditions.
None of these

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