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

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

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Automobile Engineering in ME
The function of oil control rings is that it

Maintains a seal and prevents escape of burned gases and oil leakage
Lubricates the cylinder wall by releasing oil from its hole
Keeps the cylinder wall lubricated by holding oil in its channel
Prevents engine oil from going into the combustion chamber and returns excess lubricating oil off the cylinder wall through the return holes in the piston to the oil pan

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