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The retardation or running-down test on a dc machine determines

  • A.the moment of inertia and the rotational losses
  • B.the armature resistance and the field resistance
  • C.the efficiency of the machine at full load directly
  • D.the temperature rise of the machine under load

Answer: A

Cutting the supply and recording the speed against time gives the rate of retardation, and with the inertia known the rotational loss follows. Repeating the test with a known extra loss lets the inertia itself be found.

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