Electrical Machines
If the number of rotor slots is equal to number of stator slots, then motor refuses to start. Hence it is known as

  relative speed.
  crawling.
  air gap.
  cogging.

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Electrical Machines
What will happen if the the supply terminals are reversed in case of a DC shunt motor?

 The motor will run much faster in the same direction.
 The motor will run at its normal speed in the same direction as before.
 The motor will stop.
 The motor will run in reverse direction.

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