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

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

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Automobile Engineering in ME
In a ventilated disc brake

Disc contains many small holes for optimum cooling performance
A duct directs air towards the caliper for cooling while the vehicle is moving
Caliper is covered with cooling fins
Disc contains radial vanes between its rubbing surfaces for optimum cooling performance

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