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Which weakness does a Torsen unit show with a wheel in the air?

  • A.It transfers all of the torque to the wheel remaining on the ground, which is why it suits off road use so well
  • B.It can transfer almost no torque at all
  • C.It locks completely, which prevents the vehicle from being manoeuvred until the wheel regains contact with the ground
  • D.It overheats

Answer: B

Because the bias is a ratio, multiplying a torque of nearly zero by even a large ratio still gives nearly zero. Manufacturers add a small preload or use the brakes to provide a reaction. It is the fundamental limitation of a torque sensing design. Most errors here come from carrying across a result from a neighbouring case where it does not hold. The order in which the effects act is what decides the outcome, so it is worth establishing first.

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