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Field's test is used to determine the efficiency of

  • A.a separately excited machine driven at constant speed
  • B.two identical series machines
  • C.a single shunt machine on no load
  • D.a compound machine at rated load

Answer: B

A series machine cannot be run light for a no-load test, so two are coupled with their fields in series, one motoring and one generating, and their combined losses measured. It is the series machine's equivalent of the back-to-back test.

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