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

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

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Electrical Machines
The compensating winding in a DC machine

 is located in armature slots for compensation of the armature reaction.
 is located on commutating poles for improving commutation.
  is located on pole shoes for avoiding the flashover at the commutator.
  is located on pole shoes to avoid the sparking at the brushes.

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Electrical Machines
In a DC machine the armature mmf is

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

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