Automobile Engineering in ME
The most accurate ignition system of a spark ignition engine is

Battery system
Magneto system
Electronic control unit system
Magneto and electronic system

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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
Cushion ring which prevents piston slap and knock
Compression ring and aids the top ring in sealing and cooling

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