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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.
  Equal to 1.
  Low.

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Electrical Machines
Open circuit test on transformer gives

 eddy current loss
 both 1and 2
 hysteresis loss
 copper loss

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Electrical Machines
A lap wound 4 pole dc motor has 460 conductors. Find the number of parallel paths between the conductors?

 6.
  data provided is insufficient.
  4.
  2.

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Electrical Machines
The synchronous speed of an induction motor will be increased by

  decreasing of frequency.
  increasing number of poles.
  speed can not be increased.
  increasing of frequency.

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Electrical Machines
A 5 KVA transformer has a turns ratio of N1/N2 = 10. The impedance of primary winding is 3+j5 ohms while that of secondary winding is 0.5+j0.8 ohms. The impedance of transformer when referred to primary will be

 8+j13 ohms
 3.05+j5.08 ohms
 3.5+j5.8 ohms
 53+j85 ohms

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Electrical Machines
Magnetic field of a DC generator is produced by what?

  Electromagnets.
 Both B and C.
 Permanent magnets.
 None of the options.

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