Automobile Engineering in ME
Two advantages of using helical gears rather than spur gears in a transmission system are

Strength and cost
Strength and less end thrust
Noise level and economy
Noise level and strength

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Automobile Engineering in ME
The function of a radiator fan in the cooling system is that

It cools the engine by blowing air onto the cylinder block
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

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