Automobile Engineering in ME
The advantage of the fuel injection system over the carburettor system is

All of the listed here
Improved fuel efficiency
Improved emission
Improved power output

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

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