Automobile Engineering in ME
A basic difference between the spark ignition engine and the Diesel engine is that the

Air temperature ignites the fuel in the Diesel engine
Fuel is sprayed into the combustion chamber in the Diesel engine as the piston nears T.D.C. on the compression stroke
All of these
Diesel engine compresses air alone instead of an air-fuel mixture

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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
Cushion ring which prevents piston slap and knock
Back up compression ring which will work in place of the top ring when it is broken
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
In bias ply tyres

All of these
One ply layer runs diagonally one way and another layer runs diagonally the other way
All plies run parallel to one another
Belts of steel mesh are used in the tyres

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