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

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Electrical Machines
Due to magnetic saturation, the flux per pole in a DC machine without brush shift

 decreases in generators and increases in motor with load.
  decreases in both generators and the motors with load.
 increases in generators but decreases in motor with load.
 increases in both the generators and the motors with load.

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