Electrical Machines
What is/are the necessary conditions for voltage build up in self excited generator?

 Poles should contain residual flux.
All of these
 Field winding should be properly connected to armature winding.
 Field winding resistance should be less than critical resistance.

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

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