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Electrical Machines

Electrical Machines
which of the following losses are negligible in blocked rotor test?

 mechanical loss
 both A and B
 copper loss
 iron loss

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Electrical Machines
A compound motor has

  only shunt field winding.
  only series field winding.
  tertiary winding.
  both shunt and series field winding.

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Electrical Machines
In a dc machine 72 number of coils are used. Find the number of commutator segments required?

 36
 74
 37
 72

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Electrical Machines
Brushes are always placed on--------------- , in order to achieve sparkles commutation?

 MNA
 GNA
 either GNA or MNA
None of these

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Electrical Machines
In an auto transformer, for what value of turn ratio, power transferred by inductively and conductively are same?

 0
 any of the above
 0.5
 1

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Electrical Machines
The DC compound motors are generally

 Cummulative compound.
 Level Compound.
 Differentical compound.
 None of these.

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