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Electrical Machines

Electrical Machines
Which of the following represents the operating region of slip in a 1-phase induction motor?

 0 < S < 2
 -2 < S < 2
 0 < S < 1
 -1 < S < 1

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Electrical Machines
To eliminate the 5th harmonic in the induced voltages their respective pitch factor angle should be

 30°
 18°
 36°
 72°

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Electrical Machines
Induction motor operation depends on

None of these
 stationary magnetic field.
 either of these.
 rotating magnetic field.

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Electrical Machines
In a synchronous machine, if the field flux axis is ahead of the armature field axis in the direction of rotation, the machine operating is

  synchronous motor.
  asynchronous motor.
  synchronous generator.
  asynchronous generator.

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Electrical Machines
In DC generators brushes are used for

 reduce eddy current loss
 convert ac armature current in to dc
 collecting of current without any sparkings
 collecting of voltage

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Electrical Machines
In a transformer operating at constant voltage if the input frequency increases, the core loss

 decrease.
 increase.
 remains constant.
None of these

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