Automobile Engineering in ME
If the spark plug deposit indicates black coating of soot, it indicates that the engine has been generally operating on

Most economical mixture
Too lean mixture
Too rich mixture
Stoichiometric mixture

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

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.
The internal gear is fixed to the planetary gear.
One drive shaft is splined to the central gear and the other to the planetary gear.

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