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

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

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Automobile Engineering in ME
The crankcase dilution means

Dilution of mixture passing through crankcase in two stroke engines
Dilution of lubrication oil by fuel in the crankcase D. Dilution
Dilution of fuel in the crankcase
Dilution of oil by water in the crankcase

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