Automobile Engineering in ME
The most effective method of controlling S.I. engine exhaust emission is by

Using some additives in the fuel
Using catalytic converter
None of these
Recirculating exhaust

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

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

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