Automobile Engineering in ME
During suction stroke, the inside pressure of cylinder is

Less than the atmospheric pressure
Equal to the atmospheric pressure
More than the atmospheric pressure
None of the listed here

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Automobile Engineering in ME
The function of positive crankcase ventilation (PCV) system is that it

Returns blow by gases from the crankcase to the intake system
Mixes fuel with air
Feeds blow by gases to the exhaust manifold
Promotes combustion by creating a swirling movement in the air-fuel mixture

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

The tread pattern protects the tyre's inner carcass from small stones and pieces of glass
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

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