Electrical Machines
The synchronous speed of an induction motor will be increased by

  speed can not be increased.
  increasing number of poles.
  increasing of frequency.
  decreasing of frequency.

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Electrical Machines
In a DC machine

 current and emf at the terminals are alternating.
 current and emf in armature are alternating.
 emf in armature conductors and at the terminals is alternating.
 current and emf in armature are unidirectional

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