Automobile Engineering in ME
In a four speed four stroke Diesel engine, the intake valve

opens at T.D.C. and closes at B.D.C.
not listed here
opens at 20° before T.D.C. and closes at 35° after B.D.C.
opens at 10° after T.D.C. and closes at 20° before B.D.C.

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

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