Electrical Machines
Skewing of cage rotors offers the following advantages

  all of below.
  uniform torque.
  locking tendency is reduced.
  less noise.

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

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Electrical Machines
DC Motor

  dc shunt with armature resistance control.
  dc shunt motor with field weakening.
  dc compound motor.
  dc series motor.

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