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Electrical Machines

Electrical Machines
The speed of stator rotating magnetic field (RMF) with respect to rotor is

 Nr
 S.Ns
 Ns
 Zero

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Electrical Machines
If the excitation is critical, the power factor of the alternator is

 leading power factor.
 lagging power factor.
 unity power factor.
None of these

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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

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

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Electrical Machines
In a 6 pole DC machine, 90 mechanical degrees correspond to which of the following electrical degree?

 180.
  270.
 30.
 45.

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Electrical Machines
Air core transformer as compared to iron core transformer, has

  more copper loss.
 more magnetic core loss.
 less magnetic core loss.
  no magnetic core loss.

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Electrical Machines
At the instant of starting, the per unit slip of 3 - Φ induction motor is

  0.1.
  0.5.
  0.05.
  1.0.

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