Electrical Machines
Which of the following are variable losses?

 hysteresis loss
 eddy current loss
 shunt field copper loss
 armature copper loss

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Electrical Machines
Flashing the field of DC generator means

  neutralising residual magnetism.
  making the magnetic losses forces parallel.
 increasing flux density by adding extra turns of winding.
  creating residual magnetism by a DC source.

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Electrical Machines
In case of 3 - Φ IM, plugging means

  starting the motor on load which is more than the rated load.
  pulling the motor directly on line without a rotor.
  locking of rotor due to harmonics.
  interchanging two supply phases for quick stopping.

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