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

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

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Automobile Engineering in ME
The function of a first compression ring (top ring) is that it

Maintains a seal and prevents escape of burned gases and loss of pressure in the combustion chamber
Increases the combustion temperature
Creates swirl
Maintains a seal and prevents the fuel leakage

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