Electrical Machines
In DC generators, the brushes remain in contact with conductors which

 lie in the inter polar gaps.
 lie under south pole.
 there is no hard and fast rule for this.
 lie under north pole.

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Electrical Machines
In a 3 - Φ induction motor

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

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