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Electrical Machines

Electrical Machines
Hysteresis loss will depends on

 f1.6
 f²
 f³
 f

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Electrical Machines
A frog leg winding is used in a DC machine to eliminate

 the use drum winding.
  the use equalizer in lap winding.
 the use of compensating winding.
 reactance voltage produced due to communication.

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Electrical Machines
In dc motors, under leading pole tips flux density will--------?

 either increase or decrease
 increase
 decrease
None of these

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Electrical Machines
Maximum allowable tan - delta (tanδ) of dielectric dispassion factor of power transformer insulating oil is generally taken as

 0.5 at 90°C.
  1 at 90°C.
 3 at 90°C.
 2 at 90°C.

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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?

  data provided is insufficient.
  2.
  4.
 6.

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Electrical Machines
In DC generator, the electricity produced in armature is

None of these
  DC.
  AC.
  armature is not present in DC generator.

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