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

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

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Electrical Machines
In speed control of DC Series motor, speed lower than the rated speed can be obtained by

 Any of the above.
 Connecting an additional resistance in stator circuit.
 Connecting an additional resistance in the field circuit.
 Connecting an additional resistance in the armature circuit.

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