Automobile Engineering in ME
The painting of automobiles is done to

All of these
Prevent rust from growing on the body
Retain the characteristics of steel for long
Improve its external appearance

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

Back up compression ring which will work in place of the top ring when it is broken
Cushion ring which prevents piston slap and knock
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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