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A separately excited dc motor is preferred to a series motor in a drive requiring

  • A.the simplest possible connection with no separate field supply
  • B.operation with the machine permanently uncoupled from its load
  • C.accurate speed control over a wide range
  • D.the largest possible torque at the instant of starting the load

Answer: C

Independent control of flux and armature current gives a predictable and adjustable characteristic, which the series machine's load-dependent flux does not. The series machine's advantage is its starting torque, which suits traction.

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