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Electrical Machines

Electrical Machines
The material used for commutator brushes is mostly

 mica.
 copper.
 cast iron.
  carbon.

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Electrical Machines
Transformer core is laminated to reduce

 both 1 and 2.
 hysteresis loss.
 eddy current loss.
 copper loss.

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Electrical Machines
What will be the maximum power factor of an induction motor for dispersion coefficient of 0.05?

  0.05.
 1.1.
 20.
  0.905.

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Electrical Machines
The brushes of a DC machine should be placed on the

 commutator in the inter polar axis.
 armature in the polar axis.
 armature midway between poles.
 commutator in the polar axis.

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Electrical Machines
Dissolve gas analysis of transformer oil is carried out to determine

  condition of transformer.
 condition of bushings.
 condition of bushing stud.
 condition of transformer oil.

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Electrical Machines
For high current and low current rating which winding is employed to DC machine?

 Lap winding
 Both lap and wave winding
 Wave winding
 None of above

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