Practice question

In a planetary gear set, if the planet gear carrier is held stationary and the sun gear is driven clockwise, how does the ring (annulus) gear behave?

  1. Rotates counter-clockwise (Reverse direction)
  2. Rotates clockwise at a multiplied speed
  3. Remains stationary, locking the assembly
  4. Rotates clockwise at a reduced speed

Answer: A — Rotates counter-clockwise (Reverse direction)

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