Automobile Engineering in ME
In bias ply 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
Belts of steel mesh are used in the tyres

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

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

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Automobile Engineering in ME
The rigid suspension is beneficial when

Large changes in load make it necessary to have a large suspension stroke
It is desired to reduce the unsprung mass
It is desired to have more flexibility in design
It is desired to improve tyre to ground contact characteristics

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