Electrical Machines
Flashing of DC generator means

None of these
  creation of residual magnetism by a DC source.
 neutralization of residual magnetism.
  increasing flux density by providing extra ampere-turns in field.

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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

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

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