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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
In DC generator, the electricity produced in armature is

None of these
  DC.
  AC.
  armature is not present in DC generator.

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Electrical Machines
Which of the following DC motors has got maximum relieving property?

 Differentical compound.
 Cummulative compound.
  Series.
 Shunt.

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Electrical Machines
A transformer has hysteresis loss of 30 W, at 240 V, 60 Hz. The hysteresis loss at 200 V, 50 Hz will be

 36 W.
 30 W.
 25 W.
 28 W.

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Electrical Machines
Which of the following is/are effects of armature reaction?

 increase the maintenance and repair
All of these
 increases the design cost
 increase the iron loss

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Electrical Machines
Compensating windings is placed in which part of a D.C motor?

  On yoke in the pole faces.
 On yoke in the inter pole gap.
 On armature.
None of these

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