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Hopkinson's test, or the back-to-back test, requires

  • A.one machine and a mechanical brake on its shaft
  • B.no machine to be loaded at any point in the test
  • C.the machine to be run at twice its rated speed
  • D.two identical machines coupled mechanically

Answer: D

One machine drives the other as a generator and the generated power is returned electrically, so only the losses of the pair have to be supplied. It tests both machines at full load with a small power input, which is its whole point.

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