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Swinburne's test determines the efficiency of a dc machine by

  • A.measuring the temperature rise of the machine under load
  • B.measuring the no-load losses and calculating the rest
  • C.loading the machine fully and measuring its input and output
  • D.coupling two identical machines back to back on one shaft

Answer: B

Running the machine light gives the constant losses, and the copper loss at any load is then computed from the measured resistances. It is quick and needs almost no power, but it cannot reveal how the machine behaves hot.

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