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Electrical Machines

Electrical Machines
What is power factor of a 3 - φ induction motor at no load?

  Low.
  High.
  Same as full load.
  Equal to 1.

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Electrical Machines
In a synchronous motor electromagnetic power varies

 directly as square of applied voltage
 inversely as applied voltage
 directly as applied voltage
None of these

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Electrical Machines
In which transformer, the tertiary winding is used?

 Delta - star
 Delta - delta
 Star - delta
 Star - star

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Electrical Machines
In a DC Shunt Motor the speed can be increased by

 Increasing the field current.
 Decreasing the field current.
 Increasing the field current.
 Increasing the armature current.

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Electrical Machines
In a DC machine, which of these parameters remain the same whether it runs as a DC motor or a DC generator?

 Induced emf.
 Armature current.
 Mechanical power.
 Can not be determined.

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Electrical Machines
If the armature electric current is increased to double its previous value, and the time of commutation is halved, how will the reactance voltage vary?

  It will be doubled.
  It will be halved.
 It will remain the same.
  It will becomes four times.

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