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

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

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Automobile Engineering in ME
The condition that causes vapour locking in a brake system is

An excessively high engine speed on a downhill road
Keeping the vehicle without use for an extended period
Overcooling of the brakes during high speed driving
Overheating of the fluid due to frequent brake application

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