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Electrical Machines

Electrical Machines
If the air gap of IM is increased, ____________ will increase.

  air gap flux.
  magnetizing current.
  power factor.
  speed.

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Electrical Machines
Magnetic field of a DC generator is produced by what?

 Permanent magnets.
 None of the options.
  Electromagnets.
 Both B and C.

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Electrical Machines
To achieve spark less commutation brushes of DC generator are rocked ahead so as to bring them

 just ahead of magnetic neutral axis.
None of these
 in magnetic neutral axis.
 just behind the magnetic neutral axis.

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Electrical Machines
If in a sub – station there is one 132 / 33 kV transformer whose secondary is connected with primary of one 33 / 11 kV transformer, the total transformation ratio of the sub – station will be,

 7.
  12.
 4.
 3.

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

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

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Electrical Machines
In a synchronous motor, damper windings are provided on

  pole faces.
  stator frame.
  rotor shaft.
None of these

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