Electrical Machines
Compensating windings are used in DC generators

None of these
  mainly to reduce the eddy currents by providing local short circuit.
  to provide path for the circulation of cooling air.
  to neutralize the cross magnetizing effect of the armature reaction.

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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

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

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