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Electrical Machines

Electrical Machines
Larger values of air flux density is taken while designing IM for

  both.
  larger output.
  none.
  larger bore diameter.

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Electrical Machines
The self induced emf in the coil undergoing commutation is called the

None of these
  statically induced voltage.
  dynamically induced voltage.
  reactance voltage.

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Electrical Machines
Silicon content in steel lamination is kept within 5% as it

 makes the material brittle.
 Increases cost.
All of these
 increases hysteresis loss.

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Electrical Machines
The dc motor which can provide zero speed regulation at full load without any controller, is

 shunt.
 differential compound.
 series.
 cumulative compound.

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Electrical Machines
In DC generator, the electricity produced in armature is

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

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Electrical Machines
The low voltage winding of a 400/230 V single phase 50 Hz transformer is to be connected to keep the magnetization current at the same level in both the cases the voltage at 25 Hz should be

 65 V
 230 V
 460 V
 115 V

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