Electrical Machines
Which 1 - Φ motor does operate at high power factor?

  Shaded pole.
  Capacitor start.
  Split phase.
  Capacitor run.

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Electrical Machines
Interpoles in a DC motor must be

 Series excited and should have the same polarity as that of the behind main pole in the direction of rotation of armature.
 Series excited and should have the same polarity as that of the ahead main pole in the direction of rotation of armature.
 Shunt excited and should have the same polarity as that of the ahead main pole in the direction of rotation of armature.
 Shunt excited and should have the same polarity as that of the behind main pole in the direction of rotation of armature.

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Electrical Machines
Flashing the field of DC generator means

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

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