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Electrical Machines

Electrical Machines
We can apply source transformation to voltage source when a resistance is connected to it in

  13 HP.
 14 HP.
  10 HP.
 15 HP.

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Electrical Machines
A 220 V DC generator is run at full speed without any excitation. The open circuit voltage will be

  about 50 V.
  about 2 V.
  zero.
  220 V.

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Electrical Machines
If the field winding connection of DC shunt motor is changed

 motor will not run.
 motor will become slow.
  It will run in opposite direction.
 It will run in same direction.

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Electrical Machines
For high current and low voltage rating which winding is employed to DC machine?

 Lap winding.
 Both wave and lap winding.
 Wave winding.
 No wave and lap winding.

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Electrical Machines
Demagnetization effects which of the following?

 both B and C
 commutation
 reduces the terminal voltage
 reduction in main field flux

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

 72°
 18°
 36°
 30°

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