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The back-to-back or Hopkinson arrangement is valuable for testing because

  • A.it needs no measurement of electrical quantities at all
  • B.it can be applied to a machine of any type whatever
  • C.only the losses of the pair have to be supplied from the mains
  • D.it requires only one machine and a mechanical brake

Answer: C

Coupling two identical machines and letting one drive the other as a generator returns the bulk of the power electrically, so the supply provides only the losses. Two identical machines have to be available, which is its limitation.

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