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Electrical Machines

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

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

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Electrical Machines
Eddy current loss will depends on

 Frequency
All of these
 Thickness
 Flux density

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Electrical Machines
If the field circuit of a DC shunt motor is opened

 DC Shunt Motor
 The speed of motor will be reduced.
  The motor will attain dangerously high speed.
 The armature current will reduce.

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Electrical Machines
Value of specific electric loading of Induction motor is in the range of

 30000 - 100000 ampere conductor / metre.
  400 - 4000 ampere conductor / metre.
  5000 - 45000 ampere conductor / metre.
 40 - 400 ampere conductor / metre.

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Electrical Machines
Which single phase motor is used for a refrigerator?

  Repulsion.
  Capacitor run.
  Universal.
  Split phase.

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Electrical Machines
The magnetic field which initially induces emf in the armature in a self excited DC generator is because of

None of these
 armature reaction.
  residual magnetism.
  permanent magnets.

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MORE MCQ ON Electrical Machines

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