Electrical Machines
In a three phase slip-ring induction motor, brushes are connected to

  3 - Φ AC supply.
  external star-connected resistors.
  DC supply.
  equalizing coils.

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Electrical Machines
Due to magnetic saturation, the flux per pole in a DC machine without brush shift

 increases in both the generators and the motors with load.
 increases in generators but decreases in motor with load.
 decreases in generators and increases in motor with load.
  decreases in both generators and the motors with load.

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