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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?

 1.1.
  0.905.
 20.
  0.05.

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

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

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Electrical Machines
If the applied voltage to a dc machine is 230 V, then the back emf, for maximum power developed, is

 115 V
 460 V
 230 V
 200 V

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Electrical Machines
Which of the following DC motors has got maximum relieving property?

 Differentical compound.
  Series.
 Shunt.
 Cummulative compound.

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Electrical Machines
In a DC generator, if P be the number of poles and N be the rpm of the rotor, then frequency of magnetic reversals will be

 PN/120.
 PN/2.
 PN/60.
 PN/3000.

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Electrical Machines
A shaded pole single phase induction motor can be used for

 food mixers
 personal computers as cooling fan
 wet grinders
 tape recorders

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