Automobile Engineering in ME
The combustion process in a Diesel engine is a

Constant temperature process
Constant volume process
Constant pressure process
Adiabatic process

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

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

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