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

Indicate the coolant temperature
Allow the engine to warm up quickly
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 radial vanes between its rubbing surfaces for optimum cooling performance
A duct directs air towards the caliper for cooling while the vehicle is moving
Disc contains many small holes for optimum cooling performance
Caliper is covered with cooling fins

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

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

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Automobile Engineering in ME
The path taken by intake air is

Air cleaner intake manifold carburettor (or throttle body) intake ports cylinders
Carburettor (or throttle body) air cleaner intake manifold intake ports cylinders
Air cleaner carburettor (or throttle body) intake ports intake manifold cylinders
Air cleaner carburettor (or throttle body) intake manifold intake ports cylinders

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