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Electrical Machines

Electrical Machines
Eddy current loss will depends on

 Thickness
All of these
 Flux density
 Frequency

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Electrical Machines
In dc machines, the field-flux axis and armature-mmf axis are respectively along

 direct axis and indirect axis
 quadrature axis and interpolar axis
 quadrature axis and direct axis
 direct axis and interpolar axis

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Electrical Machines
Saving of copper in auto transformer is increased as compared to two winding transformer, when transformation ratio K approaches to

 zero.
 infinity.
  unity.
 two.

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Electrical Machines
The flux is maximum in the following part of a DC motor:

 under the interpole.
 pole core.
 under leading pole tip.
 under trailing pole tip.

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Electrical Machines
A small air gap in poly phase induction motor helps to

  reduce magnetizing current.
 increase starting torque.
 reduce chance of crawling.
 reduce chance of cogging.

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Electrical Machines
In case of IM the torque is

  inversely proportional to slip.
  inversely proportional to √slip.
  directly proportional to slip2.
  directly proportional to slip.

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MORE MCQ ON Electrical Machines

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