A basic difference between the spark ignition engine and the Diesel engine is that the

A basic difference between the spark ignition engine and the Diesel engine is that the

a) Diesel engine compresses air alone instead of an air-fuel mixture

b) Air temperature ignites the fuel in the Diesel engine

c) Fuel is sprayed into the combustion chamber in the Diesel engine as the piston nears T.D.C. on the compression stroke

d) All of the above

Automobile Engineering Practice Set-7