Automobile Engineering in ME
The auto ignition in a spark ignition engine means

Ignition of the charge before the passage of flame front
Ignition induced by the passage of a spark
Automatic ignition of the charge at the end of compression
Ignition induced to supplement the process of normal combustion

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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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Automobile Engineering in ME
The main feature of Macpherson strut suspension is that

The vertical size of the suspension can be made more compact
The unsprung mass in lighter
The assembly is slightly more complicated in design
Non vertical external forces are supported by the suspension arms

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