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A load requiring constant power over a wide speed range, such as a lathe, is well matched to

  • A.a slipping coupling between machine and load
  • B.a stepped pulley arrangement with two ratios
  • C.operation above base speed with field weakening
  • D.operation below base speed at constant flux

Answer: C

A large workpiece is turned slowly at high torque and a small one quickly at low torque, which is exactly the constant-power envelope. Gearing extends the range at the low-speed end where the converter alone cannot supply the torque.

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