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

All of these
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
Diesel engine compresses air alone instead of an air-fuel mixture

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

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

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