Electrical Machines
The demagnetising component of armature reaction in a DC generator

  reduces inter poles flux density.
  results in sparking trouble.
  reduces generator emf.
  increases armature speed.

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Electrical Machines
Two of supply terminals to a 3 - Φ induction motor get interchanged during re-connection after normal maintenance. When switched on the supply, the motor will

  get heated and damaged.
  rotate in direction opposite to that before maintenance.
  not start at all.
  rotate in the same direction as before maintenance.

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