Automobile Engineering in ME
The three basic cylinder arrangements for automotive engines are

In a row, in line, and opposed
V, double row, and opposed
Flat, radial, and V
In line, V, and opposed

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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 function of a radiator fan in the cooling system is that

It draws heat out of the engine compartment
It cools the engine by blowing air onto the cylinder block
It blows air through the radiator when necessary
It is turned by wind force as the vehicle moves forward, and its rotation drives the water pump

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