Automobile Engineering in ME
The heat transfer from coolant to air in the radiator of an automobile engine takes place by

Conduction, convection and radiation
Radiation only
Convention only
Convection and radiation

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

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

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