Automobile Engineering in ME
The basic purpose of a four wheel drive (4WD) system is that it

Eliminates the need of snow tyres, tyre chains, etc.
Ensures effective transmission of engine torque to all four wheels, even on slippery road surfaces
Ensures that effective braking can be performed, even on slippery surfaces
Delivers improved cornering on dry road surfaces

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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
Creates swirl
Increases the combustion temperature
Maintains a seal and prevents the fuel leakage

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Automobile Engineering in ME
In bias ply tyres

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

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