Automobile Engineering in ME
The purpose of a thermostat in an engine cooling system is to

Allow the engine to warm up quickly
Prevent the coolant from boiling
Pressurise the system to raise the boiling point
Indicate the coolant temperature

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

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

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