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Which joint transmits uniform angular velocity at any angle?

  • A.A flexible rubber coupling
  • B.A splined sliding joint, which transmits torque without any variation because the splines remain fully engaged
  • C.A constant velocity joint
  • D.A Hooke joint, whose output speed varies twice per revolution when it is operated at an appreciable angle

Answer: C

A constant velocity joint keeps the driving and driven members in a plane that bisects the angle between the shafts, so no speed fluctuation occurs. Rzeppa and tripod designs are the common types. Front wheel drive would be impossible without them. Most errors here come from carrying across a result from a neighbouring case where it does not hold. Checking which component actually carries the load settles most questions of this kind at once. A single measurement chosen to respond to the one asymmetry beats several that respond to shared behaviour.

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