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

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
Eliminates the need of snow tyres, tyre chains, etc.
Delivers improved cornering on dry road surfaces

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Automobile Engineering in ME
The purpose of a balancer shaft is to

Reduce vibrations caused by the crankshaft rotation
Increase inertia force of the rotating crankshaft
Balance the timing in the movement of the two groups of pistons
Adjusts the timing of the intake and exhaust valve openings

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Automobile Engineering in ME
The rigid suspension is beneficial when

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

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