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Electrical Machines

Electrical Machines
Open circuit test on transformer gives

 copper loss
 eddy current loss
 both 1and 2
 hysteresis loss

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Electrical Machines
Armature reaction in DC generators will result in

 reduction in generated emf.
 short circuit.
 increase in slip.
 open circuit.

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

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

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Electrical Machines
In DC generators, the cause of rapid brush wear may be

 imperfect contact.
 rough commutator surface.
 any of above.
 severe sparking.

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Electrical Machines
Universal motor have which of the following application?

  Lift.
  Food mixer.
  Domestic pump.
  Traction.

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Electrical Machines
A transformer core is made up of a silicon steel laminations which has maximum flux density 1 Tesla. If it was cold rolled grain oriented its flux density increases to 1.6 Tesla. What is the saving in core size or area due to cold rolled grain oriented process?

 68%
 40%
 60%
 38%

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