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

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Automobile Engineering in ME
The drive-shafts are connected to the differential and wheel hubs through universal joints because the universal joints

Absorb any difference in speed between the left and right wheels when the vehicle is turning
Absorb the vibrations transferred from the surface of the road
None of these
Compensate for variations in the relative positions of the differential and the wheels which result from bumpy road surfaces or other similar driving conditions.

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Automobile Engineering in ME
The main function of a master cylinder is to

Ensure that all the wheel brakes are supplied with the same amount of fluid pressure
Boost the force applied to brake pedal
Convert brake pedal force into hydraulic pressure
Adjust the extent of brake pedal free play

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