Practice question

What is the purpose of universal joints (U-joints) in a front-engine, rear-wheel-drive (FR) propeller shaft assembly?

  1. To adjust the length of the driveshaft dynamically.
  2. To allow power transmission through changing drive angles as the rear axle moves up and down.
  3. To prevent the propeller shaft from rotating too fast.
  4. To isolate the transmission from engine vibrations.

Answer: B — To allow power transmission through changing drive angles as the rear axle moves up and down.

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