Electrical Machines
The speed of a DC series motor is

 Proportional to field current.
 Proportional to the square of the armature current.
 Proportional to the armature current.
 Inversely proportional to the armature current.

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Electrical Machines
In a 3 - Φ induction motor

  power factor at starting is low as compared to that while running.
  power factor at starting in the same as that while running.
  power factor at starting is high as compared to that while running.
  none of them.

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