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

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

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Automobile Engineering in ME
The function of a proportioning control valve (PCV) in a brake system is to

Cause less brake fluid pressure to act on the rear brakes than on the front brakes when the fluid pressure exceeds a predetermined level
Reduce the brake fluid pressure when the brakes approach their lockup point
Cause less brake fluid pressure to act on the front brakes than on the rear brakes when the fluid pressure exceeds a predetermined level
Ensure that equal pressure is supplied to the front and rear brakes throughout every braking operation

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