Electrical Machines
In DC generator, brushes are always placed along

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

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Electrical Machines
Commutation in a DC machine may be explained as a process

  by which electric current in a coil is reversed.
 by virtue of which emf is induced in the armature conductors.
  in which magnetic field is set up.
 how alternate flux affects the main field flux.

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