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

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Electrical Machines
Cogging and crawling are phenomena associated with

 the former during starting and the latter at a fraction of its rated speed.
 cage induction machines and they are essentially the same.
 the former at a fraction of its rate speed and the latter during starting.
 any of the above.

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