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A traction drive above its base speed operates as

  • A.a load whose torque rises with the square of the vehicle speed
  • B.a load requiring no torque at all above the base speed
  • C.a constant-power load
  • D.a constant-torque load throughout the whole of its speed range

Answer: C

Field weakening holds the power at the converter's limit while the available torque falls with speed, which suits a vehicle that needs high torque to start and high speed to cruise. Below base speed the same drive is constant torque.

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