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 order in which effort applied to the steering wheel is transferred to the front wheel is

Steering wheel, steering shaft, steering gearbox, steering knuckle, tie rod, front wheels
Steering wheel, steering shaft, steering gearbox, tie rod, steering knuckle, front wheels
Steering wheel, tie rod, steering gearbox, steering shaft, steering knuckle, front wheels
Steering wheel, steering gearbox, steering shaft, tie rod, steering knuckle, front wheels

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

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

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