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Electrical Machines

Electrical Machines
For pure resistive load what is the armature reaction?

 cross magnetization
 demagnetization
All of these
 magnetization

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Electrical Machines
The slip of an induction motor normally does not depend on

  rotor speed.
  shaft torque.
  core loss component.
  synchronous speed.

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Electrical Machines
If Kh is hysteresis constant, f is supply frequency, Bm maximum flux density in core of transformer, the expression of hysteresis loss in transformer, is given by

  KhfBm1.6.
 KhfBm.
 KhfBm3.
 Khf2Bm1.6.

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Electrical Machines
The shaft of induction motor may be unbalanced due to

  poor lubrication.
  uneven air gap.
  overheating of winding.
  overload.

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Electrical Machines
The stator core of a 3 - Φ induction motor is laminated in order to reduce the

  hysteresis loss.
  both of the above.
  weight of the stator.
  eddy current loss.

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Electrical Machines
Which of the following starter is sufficient to start the DC series motor ?

 4 point starter
 3 point starter
 2 point starter
All of these

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