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Electrical Machines

Electrical Machines
A commutator with a diameter of 50 cm rotating at 1000 rpm. For a brush width of 1.5 cm, find the time of commutation in ms.

 0.443.
  0.573.
 0.512.
 0.649.

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Electrical Machines
What will be the eddy current loss if the supply frequency of a transformer becomes double?

 Doubled.
 Eight times.
 Remains same.
 Four times.

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Electrical Machines
Reactive power generated or delivered significantly depends on

 load angle.
 frequency.
 both 1 and 2.
 excitation.

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Electrical Machines
Alternator operates on the principle of

  mutual induction.
  electromagnetic induction.
  self induction.
  self or mutual induction.

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Electrical Machines
Commutator in DC generator is used for

 increase efficiency
 convert AC armature current in to DC
 reduce losses
 collecting of current

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Electrical Machines
Field weakening method is also called as-----------?

 constant torque control
 constant voltage control
 constant current control
 constant power control

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