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Electrical Machines

Electrical Machines
Which of the following relation is correct?

 Xd > Xq.
 Xd < Xq.
 Xd = Xq.
None of these

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Electrical Machines
In star-delta starting of squirrel cage induction motor compared to DOL starting the starting current and torque are

 1/3, 1/√3
 1/√3, 1/3
 1/√3, 1/√3
 1/3, 1/3

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Electrical Machines
The stator frame in an induction motor is used to

  protect the whole machine.
  hold armature stamping in position.
  ventilate the armature.
  provide return path for the flux.

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Electrical Machines
Scott connections are used for

 three phase to two phase transformation.
 three phase to single phase transformation.
 single phase to three phase transformation.
 any of the above.

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Electrical Machines
What does the use the of height flux density value in transformer design lead to?

 Reduced copper loss.
  Decrease in weight/KVA.
 Reduced iron loss.
 Increase in weight/KVA.

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Electrical Machines
Breadth factor is defined as the ratio of

None of these
 emf with distributed winding to emf with concentrated winding.
 emf with concentrated winding to emf with distributed winding.
 both 1 and 2.

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