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

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

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Automobile Engineering in ME
The function of a second ring is that it is a

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
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

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Automobile Engineering in ME
The basic purpose of a four wheel drive (4WD) system is that it

Ensures that effective braking can be performed, even on slippery surfaces
Ensures effective transmission of engine torque to all four wheels, even on slippery road surfaces
Eliminates the need of snow tyres, tyre chains, etc.
Delivers improved cornering on dry road surfaces

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