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Electrical Machines

Electrical Machines
Hysteresis loss is proportional to

  f.
 f1.5.
 f2.
 f3.

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

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

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Electrical Machines
In electric locomotives which of the following motor are used ?

 DC compound motor.
 DC Shunt motor.
 DC series motor.
 Synchronous motor.

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

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

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

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

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Electrical Machines
Which motor used in Lathe machine?

  D.C. shunt motor.
  D.C. cumulative compound motor.
  D.C . series motor.
None of these

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