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Electrical Machines

Electrical Machines
When the rotor of a 3 phase induction motor is blocked then the slip is

 0.3.
  1.
  0.54.
 0.7.

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

 iron loss
 both A and B
 copper loss
 mechanical loss

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Electrical Machines
If the flux of DC motor approaches zero, its speed will

 remain unchanged.
 approach zero.
 between zero and infinity.
 aprroach infinity.

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Electrical Machines
In DC generator, full form of MNA is what?

 Magnetic neutral armature co-ordinate.
 Magnetically no-load armature co-ordinate.
  Magnetic neutral axis.
 Magnetic no-load axis.

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Electrical Machines
The power input to a 3 - φ induction motor is 60 kW and stator loss is 1 kW the rotor cu loss per phase is

  slip X 50 / 3.
  slip X 59 / 3.
  slip X 69 / 3.
 1.

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Electrical Machines
What is the actual arrangement of series wound generator?

 Armature winding is in series with load.
  Armature and field both are in series with the load.
 Armature and field both are connected.
 Armature and field both are parallel.

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