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Electrical Machines

Electrical Machines
To eliminate 5th harmonic in the induced voltage phase breadth should be

 72°
 18°
 30°
 36°

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Electrical Machines
In a lap winding dc machine number of conductors are 100 and number of parallel paths are 10. Find the average pitch

 10
 50
 1
 100

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Electrical Machines
Magnetic field of a DC generator is produced by what?

  Electromagnets.
 None of the options.
 Both B and C.
 Permanent magnets.

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Electrical Machines
What will be the maximum power factor of an induction motor for dispersion coefficient of 0.05?

  0.905.
 1.1.
 20.
  0.05.

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Electrical Machines
The principle of operation of a 3 - Φ induction motor is almost similar to that of

  capacitor start induction motor.
  transformer with secondary short circuited.
  synchronous motor.
  repulsion start induction motor.

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Electrical Machines
Iron loss in a transformer mainly occurs in

 steel core in transformer.
 winding of transformer.
 iron made tank of transformer.
 transformer insulating oil.

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