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 ignition in a spark ignition engine takes place when the piston is

Leaving the T.D.C. position on its compression stroke
Approaching the T.D.C position on its exhaust stroke
Approaching the T.D.C. position on its compression stroke
Exactly at the T.D.C. position on its compression stroke

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