Automobile Engineering in ME
In a Diesel engine, the function of a fuel injector is to

Spray atomized fuel in the cylinder
Ignite the air-fuel mixture
Mix the fuel and air
Provide flame front for ignition

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Automobile Engineering in ME
In a ventilated disc brake

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

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