Automobile Engineering in ME
The stroke of an engine is the

Distance between T.D.C. and B.D.C.
Internal diameter of the cylinder
Length of the connecting rod
Volume of the cylinder

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

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