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Electrical Machines

Electrical Machines
Eg (generated emf) and Eb (back emf) both are

 none of above.
 different.
 same.
 changes.

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Electrical Machines
Which of the following represents the rotating losses of machine?

 All of the them
 Eddy current losses
 Friction and windage losses
 Hysteresis losses

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

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

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Electrical Machines
Breadth factor is defined as the ratio of

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

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Electrical Machines
In a transformer the magnetic coupling between the primary and secondary winding can be increased by

 using soft material for winding.
 increasing the number of turns.
 using the magnetic core of low reluctance.
 using transformer oil of better quality.

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Electrical Machines
The torque developed in IM is nearly proportional to

  V.
 1 / V2.
  1 / V.
  V2.

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