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Electrical Machines

Electrical Machines
In a 6 pole DC machine, 90 mechanical degrees correspond to which of the following electrical degree?

 30.
  270.
 45.
 180.

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Electrical Machines
Exciting current of an induction motor is

  higher than power transformer.
  lesser than power transformer.
  equal as power transformer.
  none of these.

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Electrical Machines
Which of following winding is connected in series with armature winding of DC machine?

 Auxiliary winding.
 Commutating pole winding.
 Both Compensating and Commutating pole winding.
 Compensating winding.

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Electrical Machines
Stray losses in transformer occurs in

 steel core.
 transformer insulating oil.
 paper insulation in transformers.
  winding conductors and steel structures of transformer.

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Electrical Machines
Which of the following bearings and their uses are correct

 neither 1 nor 2
 both A and B
 ball bearings → small machines
 roller bearings → large machines

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Electrical Machines
If the field circuit of a DC shunt motor is opened

  The motor will attain dangerously high speed.
 The speed of motor will be reduced.
 DC Shunt Motor
 The armature current will reduce.

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