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Electrical Machines

Electrical Machines
The constant losses in transformer is/are

 hysteresis loss.
 both 2 and 3.
 eddy current loss.
 copper loss.

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

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

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Electrical Machines
DC Shunt Motor has disadvantage(s) of

 constant speed.
 none of above.
 less expensive.
 not suitable for rapidly changing loads.

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Electrical Machines
Stray losses in transformer occurs in

 transformer insulating oil.
 steel core.
  winding conductors and steel structures of transformer.
 paper insulation in transformers.

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Electrical Machines
Example of double excited machine is

None of these
 Synchronous motor.
 DC Shunt Motor
 Both are correct.

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Electrical Machines
The overall power factor of an on load transformer

 is always unity.
 is always leading.
  depends on the power factor of the load.
 is always lagging.

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