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Electrical Machines

Electrical Machines
Open circuit test on transformer gives

 copper loss
 eddy current loss
 hysteresis loss
 both 1and 2

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Electrical Machines
Ward-Leonard control is basically a ___________ control method.

 Field diverter control.
 Armature voltage control.
 Field control.
 Armature resistance control.

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Electrical Machines
Which of the following is/are the advantages of carbon brush over the copper brush?

 They are self lubricating in nature
 In case of any sparking they will be less damaged than copper brushes
All of these
 They are not hard as copper brush

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Electrical Machines
Reversing the direction of rotation of split phase motors is done by

 reversing the terminals of main winding.
 reversing the terminals of starting winding.
 interchanging the capacitor from starting winding to main winding or vice versa.
All of these

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Electrical Machines
Sparkless commutation can be achieved by employing

  inter poles.
  high resistance carbon brushes.
 compensating winding.
  any one or more of the above methods.

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Electrical Machines
Ward Leonard control is provides speed control

  Below rated speed.
  In one direction only.
  In both direction.
  Above rated speed.

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MORE MCQ ON Electrical Machines

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