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Direct determination of a machine's efficiency requires

  • A.two identical machines coupled mechanically back to back
  • B.no measurement at all beyond the nameplate data
  • C.the input and output to be measured simultaneously at full load
  • D.only the no-load losses to be measured and the rest computed

Answer: C

Correct answer: the input and output to be measured simultaneously at full load

Direct determination measures both ends and takes the ratio, which requires a means of loading the machine to its rating and absorbing that power. It is straightforward for small machines and impractical for large ones, both because of the power involved and because of the accuracy problem.

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