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

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

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Automobile Engineering in ME
The main function of a master cylinder is to

Ensure that all the wheel brakes are supplied with the same amount of fluid pressure
Boost the force applied to brake pedal
Adjust the extent of brake pedal free play
Convert brake pedal force into hydraulic pressure

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