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

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

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Electrical Machines
In speed control of DC Series motor, speed lower than the rated speed can be obtained by

 Connecting an additional resistance in the field circuit.
 Any of the above.
 Connecting an additional resistance in stator circuit.
 Connecting an additional resistance in the armature circuit.

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