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Electrical Machines

Electrical Machines
When flux density is constant in a transformer, hysteresis loss varies as

 f
 f²
 V²
 V

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Electrical Machines
Thin laminations are used in a machine in order to reduce

 Hysteresis losses
 Both 1 and 2
 Eddy current losses
 Copper losses

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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

 80.
 50.
 36.
  18.

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Electrical Machines
A 20KVA auto transformer, turn ratio is 0.8. Find the power transferred conductively?

 20KVA
 4KVA
 16KVA
 0KVA

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Electrical Machines
The interpoles in dc machines have a tapering shape in order to

 increase the acceleration of commutation
 reduce the overall weight
 reduce the saturation in the interpole
 economise on the material required for interpoles and their windings

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Electrical Machines
Motors for fans and pumps are selected in the rpm range

  720 to 920.
  375 to 500.
  500 to 720.
  1440 to 2880.

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MORE MCQ ON Electrical Machines

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