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

Increases the combustion temperature
Creates swirl
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

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Automobile Engineering in ME
In bias ply tyres

All plies run parallel to one another
One ply layer runs diagonally one way and another layer runs diagonally the other way
All of these
Belts of steel mesh are used in the tyres

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