Automobile Engineering in ME
The characteristic that is enhanced by the honing of cylinder sleeves inner surface is

Resistance to wear
Cooling efficiency
Lubrication performance
None of these

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

Compression ring and aids the top ring in sealing and cooling
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

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