Automobile Engineering in ME
Which one of the following statements correctly describes the construction of a planetary gear type differential?

Each planetary pinion gear meshes with both the central gear and the internal gear.
The six planetary pinions rotate in constant mesh with the internal gears.
One drive shaft is splined to the central gear and the other to the planetary gear.
The internal gear is fixed to the planetary gear.

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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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