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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Automobile Engineering in ME
The main function of the tread pattern on tyre is that

The tread grooves pass air between the tyre and road surface, thereby preventing tyre from overheating
In wet conditions, the tread grooves expel water that is drawn between the tyre and road surface
The crests between the tread grooves absorb road noise
The tread pattern protects the tyre's inner carcass from small stones and pieces of glass

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