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Electrical Machines

Electrical Machines
Field weakening control method is used for the _________ ?

None of these
 both A and B
 below rated speed
 above rated speed

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Electrical Machines
In dc machine armature windings are placed on rotor because of the necessity for

 electromechanical energy conversion.
 development of torque.
 generation of voltage.
 commutation.

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Electrical Machines
Speed of DC motor can be controlled by varying

 resistance of armature culture.
 all of these.
 its flux oer pole.
 applied voltage.

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Electrical Machines
Tap changer is generally provided in

 voltage transformer.
 current transformer.
  power transformer.
 earthing transformer.

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Electrical Machines
In an alternator the voltage generated per phase is proportional to

  frequency of waveform.
  flux per pole.
  number of turns in coil.
All of these

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Electrical Machines
Flux density under leading pole tips in case of generator will

 either increase or decrease
None of these
 increase
 decrease

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