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In a gear train, when the axes of the shafts, over which the gears are mounted, move relative to a fixed axis, is called

(a) simple gear train

(b) compound gear train

(c) reverted gear train

(d) epicyclic gear train

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This intriguing question originated from Gear Trains topic in portion Toothed Gearing & Gear Trains of Machine Kinematics

1 Answer

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by (45.7k points)
Right option is (d) epicyclic gear train

Explanation: In an epicyclic gear train, the axes of the shafts, over which the gears are mounted, may move relative to a fixed axis.

When the axes of the first gear (i.e. first driver) and the last gear (i.e. last driven or follower) are co-axial, then the gear train is known as reverted gear train.

When there are more than one gear on a shaft, as shown in Fig. 13.2, it is called a compound train of gear.

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