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

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

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Electrical Machines
No load primary current in a transformer

 leads the applied voltage somewhat less than 90Ã&
 leads the applied voltage by exactly 90Â&
 lags behind applied voltage somewhat less than 90Ã
 lags behind applied voltage by exactly 90Â&am

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