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Electrical Machines

Electrical Machines
What is power factor of a 3 - φ induction motor at no load?

  High.
  Same as full load.
  Low.
  Equal to 1.

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Electrical Machines
For the above problem, find the induced voltage of an alternator of it is to deliver a load of 100 A at power factor of 0.8 lagging with terminal voltage of 200 V.

  222 V.
 220 V.
 225 V.
 230 V.

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Electrical Machines
Iron loss in a transformer mainly occurs in

 winding of transformer.
 steel core in transformer.
 iron made tank of transformer.
 transformer insulating oil.

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Electrical Machines
In case of a compensated DC series motor, the compensating winding is provided

 In parallel with the field winding.
 In parallel with the armature winding.
 As a separate unit.
  In series with the armature winding.

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Electrical Machines
In a synchronous machine, if the field flux axis is ahead of the armature field axis in the direction of rotation, the machine operating is

  asynchronous generator.
  asynchronous motor.
  synchronous motor.
  synchronous generator.

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Electrical Machines
A dc series motor driving and electric train faces a constant power load. It is running at rated speed and rated voltage. If the speed has to be brought down to 0.25 p.u. the supply voltage has to be approximately brought down to

  0.25 p.u
  0.5 p.u
  0.75 p.u
  0.125 p.u

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