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Which differential type connects the two shafts rigidly when engaged?

  • A.A viscous coupling, which transmits an increasing torque as the difference in speed between the two shafts grows
  • B.A locking differential
  • C.A limited slip differential, which resists but does not entirely prevent a difference in speed between the shafts
  • D.A Torsen unit

Answer: B

A locker engages a dog clutch that ties a sun gear to the cage, forcing both wheels to turn at the same speed regardless of grip. It must be disengaged on high grip surfaces. Automatic lockers engage and disengage without driver action. The order in which the effects act is what decides the outcome, so it is worth establishing first. Reading the definition literally, rather than recalling a summary, avoids the usual confusion.

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