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Electrical Machines

Electrical Machines
The wattage rating of a ceiling fan motor will be

 200 - 250 W.
 10 - 20 W.
  50 - 150 W.
 250 - 500 W.

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Electrical Machines
A 100 KVA transformer is operating at 60 Hz, 240 V supply. The same transformer is operating at 50 Hz, 200 V supply. The new rating is

 50 KVA
 123.3 KVA
 100 KVA
 83.33 KVA

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Electrical Machines
In a dc machine 6 pole wave winding is used. The number of parallel paths are?

 6
 1
 4
 2

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Electrical Machines
In a DC generator the emf generated by the armature is maximum when

 induced voltage is high.
 rate of change of flux is minimum.
  rate of change of flux is maximum.
 shaft rotation is high.

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Electrical Machines
Autotransformer makes effective saving on copper and copper losses, when its transformation ratio is equal to

  less than one.
  very low
  greater than one.
  approx to one.

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Electrical Machines
In a DC generator the actual flux distribution depends upon

  clearance between tips of the adjacent pole shoes.
 size of air gap.
  shape of the pole shoe.
  all of above.

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MORE MCQ ON Electrical Machines

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