Automobile Engineering in ME
The function of a second ring is that it is a

Cushion ring which prevents piston slap and knock
Back up compression ring which will work in place of the top ring when it is broken
Back up oil control ring which will work in place of the bottom ring when it is broken
Compression ring and aids the top ring in sealing and cooling

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Automobile Engineering in ME
Which one of the following statements correctly describes the construction of a planetary gear type differential?

One drive shaft is splined to the central gear and the other to the planetary gear.
The internal gear is fixed to the planetary gear.
Each planetary pinion gear meshes with both the central gear and the internal gear.
The six planetary pinions rotate in constant mesh with the internal gears.

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