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Electrical Machines

Electrical Machines
The no load current in a transformer lags the applied voltage by

 0°.
 90°.
 about 115°.
  about 75°.

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Electrical Machines
In DC series motor the speed is ______________ proportional to the armature current.

 directly.
 none of these.
 has no relation.
 inversely.

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Electrical Machines
1 KVA, 230 V, 50 Hz, single phase transformer has an eddy current loss of 30 watts. The eddy current loss when the transformer is excited by a dc source of same voltage will be

 less than 30 W
 zero watt
 30 W
 more than 30 W

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Electrical Machines
The direction of rotation of a DC motor can be determined by

 Lenz's law.
 Fleming's right hand rule.
 Ampere's law.
  Fleming's left hand rule.

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Electrical Machines
which of the following type of brush and their application is/are correct

 copper graphite → low voltage high current density
 electro graphite → large ratings
All of these
 carbon brush → normal ratings

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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?

  4.
 6.
  2.
  data provided is insufficient.

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