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Electrical Machines

Electrical Machines
What is power factor of a 3 - φ induction motor at no load?

  High.
  Same as full load.
  Low.
  Equal to 1.

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Electrical Machines
Satisfactory commutation of DC machine requires

 brushes should be of proper grade and size.
 brushes should smoothly run in the holders.
 smooth, concentric commutator properly undercut.
All of these

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Electrical Machines
In DC generator, which component plays the vital role to produce the direct current?

 Armature.
 Yoke.
  Commutator.
 Brush.

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Electrical Machines
In above question, the output power delivered by generator G1 and G2 will be

 9.3 kW, 9.3 kW.
 5.7 kW, 8.7 kW.
 9.6 kW, 12 kW.
  6.3 kW, 9.3 kW.

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

 Both lap and wave winding
 Lap winding
 Wave winding
 None of above

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Electrical Machines
R1 is the resistance of the primary winding of the transformer. The turn ratio in terms of primary to secondary is K. Then the equivalent resistance of the primary referred to secondary is

 K²R1
 K×R1
 R1 /K
 R1 /K²

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