Automobile Engineering in ME
The aspect ratio (expressed in percentage) of the tyre is defined as the ratio of

Wheel diameter to section width
Section height to section width
Wheel diameter to section height
Section width to section height

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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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Automobile Engineering in ME
Wheel base of a vehicle is the

Distance between the centres of the front and rear wheels
Distance between the centres of the front tyres
Distance between the centres of the rear tyres
Extreme length of the vehicle

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