Electrical Machines
Mechanical energy is supplied to DC generator at the rate of 4200 J / s. The generator delivers 32.2 Amp at 120 V. What is the percentage efficiency of the generator?

 210 V.
 212 V.
  201.02 V.
 205 V.

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Electrical Machines
In a DC machine the armature mmf is

  rotating with respect to field poles as well as armature.
  stationary with respect to field poles.
 rotating with respect to field poles.
  stationary with respect to armature.

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