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Electrical Machines

Electrical Machines
In a transformer maximum flux density is not constant, the eddy current loss varies as

 V
 f²
 f
 V²

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Electrical Machines
Winding conductors of an electrical power transformer are mainly insulated by

 rubber insulation.
 cotton insulation.
  paper insulation.
 wooden insulation.

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Electrical Machines
A 230 volt dc motor has an armature winding resistance of 0.5 ohm. Calculate the emf induced by the motor if the full load armature current is 23 ampere.

 220.4 volt.
  218.5 volt.
  None of these.
  120 volt.

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Electrical Machines
We can apply source transformation to voltage source when a resistance is connected to it in

 15 HP.
 14 HP.
  13 HP.
  10 HP.

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Electrical Machines
In an alternator the voltage generated per phase is proportional to

  number of turns in coil.
  frequency of waveform.
All of these
  flux per pole.

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Electrical Machines
Pole changing methods are suitable only for ___________ type induction motor.

  cage.
  wound.
  linear.
  none of these.

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