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Electrical Machines

Electrical Machines
In dc machines, the space distribution of air-gap flux density wave at no load is

 flat-topped
 co- sinusoidal
 sinusoidal
 rectangular

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Electrical Machines
The brush-axis of a bipolar dc motor is rotated by 90°. The effect of this rotation on the back emf Eband the torque developed Tdwould be such that

 both Eb and Td are unchanged
 both Eb and Td are zero
 Eb is zero, but Td is unchanged
 Eb is unchanged, but Td is zero

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Electrical Machines
In DC generators brushes are used for

 reduce eddy current loss
 collecting of current without any sparkings
 convert ac armature current in to dc
 collecting of voltage

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Electrical Machines
When pure inductive load is connected to the alternator, what is the effect of armature reaction?

None of these
 Magnetization
 Cross magnetization
 Demagnetization

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Electrical Machines
The stator core of a 3 - Φ induction motor is laminated in order to reduce the

  eddy current loss.
  both of the above.
  hysteresis loss.
  weight of the stator.

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Electrical Machines
If a DC motor is connected across the AC supply it will

 Run at normal speed.
 Run at lower speed.
  Burn.
 Not run.

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