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Electrical Machines

Electrical Machines
What will be the maximum power factor of an induction motor for dispersion coefficient of 0.05?

  0.905.
 20.
 1.1.
  0.05.

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Electrical Machines
The heat transfer by convection in a transformer least depends on

  color of the paint.
 surface area.
 air velocity.
 temperature difference.

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Electrical Machines
For same HP rating and full load speed which of following motor has poor starting torque?

 Differently compounded.
 Shunt.
 Series.
 Cummulative compound.

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Electrical Machines
Stray losses in transformer occurs in

 transformer insulating oil.
 steel core.
 paper insulation in transformers.
  winding conductors and steel structures of transformer.

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Electrical Machines
In a DC generator the actual flux distribution depends upon

  all of above.
  clearance between tips of the adjacent pole shoes.
 size of air gap.
  shape of the pole shoe.

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Electrical Machines
The rotor electromotive force of the IM is observed to make 100 complete alterations per minute, calculated slip

None of these
 0 .001 %.
 3 %.
  3.33 %.

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