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Electrical Machines

Electrical Machines
Oil is provided in an oil filled transformer for

  insulating.
 lubrication.
 cooling.
  both cooling and insulation.

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Electrical Machines
What is/are the advantages of parallel operation of alternators?

 Increase in reliability
All of these
 continuity supply is maintained
 Increase efficiency under light load conditions

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Electrical Machines
In a Dc generator the magnetic neutral axis coincide with geometrical neutral axis, when

  there is no load on the generator.
  the generator runs on overload.
  the generator runs on full load.
  the generator runs on designed speed.

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Electrical Machines
The torque speed characteristics of a AC servomotor is approximately

 linearised
 any of the above
 parabola
 hyperbola

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Electrical Machines
Capacitor in split phase induction motor is used to

 reduce the harmonics.
 improve the power factor.
 start the motor.
 improve the starting torque.

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Electrical Machines
Breather is provided in a transformer to

  absorb moisture of air during breathing.
 filter the transformer oil.
 provide cold air in transformer.
 absorb moisture from air entering in transformer.

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