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Electrical Machines

Electrical Machines
Regenerative braking is not found in which motor?

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

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Electrical Machines
A 230 V dc series generator is driven at its rated speed. The no-load voltage across its armature terminals would be

 somewhat more than 230 V
 6 V
 somewhat less than 230 V
 230 V

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Electrical Machines
If the field connection of a DC Shunt Motor is changed then

 it will run in same direction.
 it will run in opposite direction.
 it will run in same direction by slowly.
 motor will not run.

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Electrical Machines
Armature reaction in dc motor results

  increase in speed.
  decrease in speed.
  short circuit.
  open circuit.

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Electrical Machines
In a dc machine, the demagnetizing effect of armature reaction is due to

 magnetic saturation in half of the field pole
 non-sinusoidal nature of armature mmf
 uneven air-gap length
 component of armature mmf along field axis

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Electrical Machines
The full load copper loss and iron loss of transformer are 6400W and 5000W respectively. The copper loss and iron loss at half load will be respectively?

 1600 W and 1250 W
 1600 W and 5000 W
 3200 W and 2500 W
 3200 W and 5200 W

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