Electrical Machines
DC Motor

  dc series motor.
  dc compound motor.
  dc shunt motor with field weakening.
  dc shunt with armature resistance control.

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Electrical Machines
The synchronous reactance( Xs) is the

 reactance due to leakage flux
 combined reactance due to armature reaction and leakage flux
 reactance either due to armature reaction or leakage flux
 reactance due to armature reaction of the machine

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