Automobile Engineering in ME
In radial tyres

All plies run parallel to one another and vertical to tyre bead
None of these
Inner tubes are always used
One ply layer runs diagonally one way and another layer runs diagonally the other way

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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 that effective braking can be performed, even on slippery surfaces
Delivers improved cornering on dry road surfaces
Ensures effective transmission of engine torque to all four wheels, even on slippery road surfaces

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