Discussion
Which arrangement gives reverse in an epicyclic set?
Answer: C
With the carrier held stationary the planets act as simple idlers, so the annulus turns opposite to the sun and reverse is obtained. Locking any two members together gives direct drive with the whole set rotating as a unit. Those three cases cover reduction, reverse and direct drive from one set of gears. Checking which component actually carries the load settles most questions of this kind at once. Most errors here come from carrying across a result from a neighbouring case where it does not hold.
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