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

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

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Automobile Engineering in ME
The correct flow of power through the drive train is

Engine main shaft, counter shaft, clutch, final driven gear, drive shafts, wheels
Engine clutch, main shaft, counter shaft, final driven gear, drive shafts, wheels
Engine drive shafts, clutch, main shaft, counter shaft, final driven gear, wheels
Engine clutch, counter shaft, main shaft, final driven gear, drive shafts, wheels

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