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Electrical Machines

Electrical Machines
Eddy current loss will depends on

 Frequency
 Thickness
All of these
 Flux density

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Electrical Machines
A 230 volt dc motor has an armature winding resistance of 0.5 ohm. Calculate the emf induced by the motor if the full load armature current is 23 ampere.

 220.4 volt.
  None of these.
  120 volt.
  218.5 volt.

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Electrical Machines
If the load current and the flux of a DC motor are held constant and voltage applied across its armature is increased by 5%, the speed of the motor will

 remain unchanged.
 depend on other factors.
 increase by 5 %.
 reduce by 5 %.

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Electrical Machines
For a standard frequency the machine operates at a particular speed known as

 normal speed.
 synchronous speed.
 any of the above.
 slip speed.

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Electrical Machines
Ideal value of voltage regulation of a device is?

 ∞
 0
 a positive finite value
 a finite negative value

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Electrical Machines
A lap wound 4 pole dc motor has 460 conductors. Find the number of parallel paths between the conductors?

  2.
 6.
  4.
  data provided is insufficient.

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