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

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

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Automobile Engineering in ME
The main function of the tread pattern on tyre is that

The tread grooves pass air between the tyre and road surface, thereby preventing tyre from overheating
The tread pattern protects the tyre's inner carcass from small stones and pieces of glass
In wet conditions, the tread grooves expel water that is drawn between the tyre and road surface
The crests between the tread grooves absorb road noise

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