Electrical Machines
In a DC shunt generator working on load, the brushes are moved forward in the direction of rotation, as a result of this, commutation will

  worsen and terminal voltage will rise.
 improve but terminal voltage will fall.
  worsen and terminal voltage will fall
  improve and terminal voltage will rise .

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

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

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