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Stray load loss in an efficiency determination is usually

  • A.computed exactly from the machine's dimensions
  • B.taken as an agreed percentage of rated output
  • C.measured directly with the machine on full load
  • D.ignored entirely as being too small to matter

Answer: B

Correct answer: taken as an agreed percentage of rated output

Stray load loss arises from flux harmonics, skin effect and eddy currents in structural parts, and it is very difficult to measure with confidence. The standards therefore prescribe a conventional allowance - a stated fraction of rated output - so that efficiencies quoted by different manufacturers remain comparable.

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