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Electrical Machines

Electrical Machines
The output power of a dc motor is given by

  EbIa2.
  EIa.
  none of these.
  EbIa.

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Electrical Machines
For pure resistive load what is the armature reaction?

 cross magnetization
 magnetization
 demagnetization
All of these

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Electrical Machines
In a synchronous motor electromagnetic power varies

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

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Electrical Machines
Regenerative braking is not found in which motor?

 DC shunt.
 DC compound.
 Induction motor.
  DC series.

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Electrical Machines
For a practical synchronous motor the pull out torque will occur when the torque angle is nearly equal to

 30°.
  75°.
 0°.
 45°.

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Electrical Machines
Which of the following is minimized by laminating the core of a transformer?

 Eddy current loss.
 Hysteresis loss.
 Copper loss.
 Stray loss.

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