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Electrical Machines

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

None of these
 GNA
 MNA
 either GNA or MNA

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Electrical Machines
In a DC generator in case the brushes are moved so as to bring them in magnetic neutral axis, then, there will be

  cross-magnetization as well as demagnetization.
 demagnetisation.
  none of above.
  cross-magnetisation.

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Electrical Machines
In above question, find rms line voltage for delta connection?

 399 V.
  230.2 V.
 50 V.
 100 V.

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Electrical Machines
In an induction motor, what is the ratio of rotor input to rotor copper loss?

 1/(1-S)
 1/S
 S
 1-S

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Electrical Machines
In DC generator, brushes are always placed along

 load axis.
 geometrical neutral axis.
  magnetic neutral axis.
 armature axis.

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Electrical Machines
Induction motor operation depends on

 stationary magnetic field.
None of these
 either of these.
 rotating magnetic field.

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