Electrical Machines
A synchronous generator is feeding a zero power factor (lagging) load at rated current. The armature reaction is

 ineffective.
 magnetizing.
  demagnetizing.
 cross – magnetizing.

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

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