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

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

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Electrical Machines
DC Motor

  dc series motor.
  dc shunt motor with field weakening.
  dc shunt with armature resistance control.
  dc compound motor.

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Electrical Machines
The residual magnetism of a self-excited dc generator is lost. To build up its emf again

 the field winding must be replaced
 field winding must be excited by low voltage dc supply
 the armature connection must be reversed
 the field winding connection must be reversed

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