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Speed control by changing the gear ratio is efficient because it

  • A.reduces the power the load requires at every speed
  • B.removes the need for any motor at all
  • C.dissipates the surplus power in the gearbox
  • D.involves no slip in the power path

Answer: D

Correct answer: involves no slip in the power path

A gear or belt transmits torque by contact, trading speed for torque with only the small losses of meshing and bearings. Nothing corresponds to the slip term of a fluid or eddy current coupling, so the efficiency stays high at every ratio - the drawback being that the ratio is fixed once chosen.

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