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Which restriction applies to a locked differential on tarmac?

  • A.No restriction applies
  • B.It increases the fuel consumption substantially, because the additional friction within the unit absorbs power
  • C.It causes wind up and tyre scrub during cornering
  • D.It reduces the traction available, since both wheels are forced to turn at the same speed regardless of the grip

Answer: C

With both wheels forced to the same speed, the different path lengths through a corner strain the axle until a tyre slips. On loose surfaces the tyres slip harmlessly. On tarmac the strain damages the driveline and scrubs the tyres. Checking which component actually carries the load settles most questions of this kind at once. Most errors here come from carrying across a result from a neighbouring case where it does not hold.

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