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Electrical Machines

Electrical Machines
The power factor of an induction motor operating at no load will have a value around

 0.2 lead
 0.9 lag
 0.2 lag
 unity

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Electrical Machines
Armature coil is short circuited by brushes when it lies

  along field axis.
  along neutral axis.
  in any of above positions.
  in none of above positions.

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Electrical Machines
A 3 - Φ induction motor draws an current of 50 A from mains when starts by direct switching. If an auto transformer with 60 % tapping is used for starting the current drawn from the mains will be

 36.
 80.
 50.
  18.

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Electrical Machines
In diesel engine, gas engine type of machine contains ___________________ pole type of alternator.

 none of these.
  salient.
 cylindrical.
 non uniform cylindrical.

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Electrical Machines
Dissolve gas analysis of transformer oil is carried out to determine

 condition of bushing stud.
  condition of transformer.
 condition of bushings.
 condition of transformer oil.

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Electrical Machines
Which of the following induction motor has maximum speed?

 8 pole.
  2 pole.
 4 pole.
 6 pole.

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MORE MCQ ON Electrical Machines

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