Electrical Machines
The speed of rotation of 5th harmonic component in the stator of an induction motor is

  0.5 times the synchronous speed.
  (1 / 5) times the synchronous speed.
 5 times the synchronous speed.
 (1 / 15) times the synchronous speed.

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Electrical Machines
The residual magnetism of a self-excited dc generator is lost. To build up its emf again

 the field winding must be replaced
 the field winding connection must be reversed
 field winding must be excited by low voltage dc supply
 the armature connection must be reversed

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