Automobile Engineering in ME
The condition that results in large quantities of HC emission is

Incomplete combustion
High temperature combustion
High atmospheric temperature combustion
Low temperature combustion

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

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