Electrical Machines
In shapers and slotters which motor are preferred?

  Double cage motor.
  Slip ring IM.
  Synchronous motor.
  Squirrel cage IM.

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Electrical Machines
When the supply terminal of a DC shunt motor are interchanged

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

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Electrical Machines
Cogging in induction motor occurs when

 number of stator teeth - number of rotor teeth = negative number.
 number of stator teeth - number of rotor teeth = 0.
 number of stator teeth - number of rotor teeth = odd number.
 number of stator teeth - number of rotor teeth = even number.

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