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Electrical Machines

Electrical Machines
Hysteresis loop represents the area of

 total iron losses
 hysteresis loss
 eddy current loss
 copper loss

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Electrical Machines
In a DC generator in case the brushes are moved so as to bring them in magnetic neutral axis, then, there will be

 demagnetisation.
  cross-magnetization as well as demagnetization.
  cross-magnetisation.
  none of above.

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Electrical Machines
Transformer oil is used as

 inert medium.
 a coolant.
 both A and B.
 an insulator.

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Electrical Machines
An 8 pole DC generator has 500 armature conductors and useful flux per pole of 0.065 Wb. What will be the emf generated if it is lap connected and runs at 1000 rpm. What must be the speed at which it is driven to produce the same emf if it is wave wound?

 541.67V, 250 rpm.
 2166.67V, 270 rpm.
 541.67V, 200 rpm.
 2166.67V, 230 rpm.

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Electrical Machines
In DC generators brushes are used for

 collecting of current without any sparkings
 collecting of voltage
 convert ac armature current in to dc
 reduce eddy current loss

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Electrical Machines
What happens if fifth multiples of harmonics is given to induction motor?

  It will rotates in reverse direction.
  Either short circuit or open circuit occurs.
  Fail to start.
  It will rotates in normal operation.

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