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Electrical Machines

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

 18°
 36°
 30°
 72°

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Electrical Machines
In DC generator, lap winding is used in

 where constant speed is required.
 where greater load is connected.
  high current and low voltage applications.
 high voltage and low current applications.

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Electrical Machines
In a Dc generator the magnetic neutral axis coincide with geometrical neutral axis, when

  the generator runs on full load.
  there is no load on the generator.
  the generator runs on overload.
  the generator runs on designed speed.

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Electrical Machines
It is an advisable to use auto transformer if the transformation ratio is

 near to 1.
 0.25.
 Greater than 1.
 0.5.

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Electrical Machines
If the speed of a dc motor increases with load torque, then it is a

 comulatively compounded motor
 differentially compounded motor
 series motor
 permanent magnet motor

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Electrical Machines
Total core loss is also called as -------------?

 Hysteresis loss
 Eddy current loss
 Magnetic loss
 Copper loss

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MORE MCQ ON Electrical Machines

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