Electrical Machines
In a DC machine the armature mmf is

  stationary with respect to armature.
  stationary with respect to field poles.
 rotating with respect to field poles.
  rotating with respect to field poles as well as armature.

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Electrical Machines
In a synchronous generator with constant steam input supplies power to an infinite bus at a lagging power factor. If the excitation is increased

 power angle increase and power factor decrease
 both power angle and power factor increase
 power angle decrease and power factor increase
 both power angle and power factor decrease

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