Electrical Machines
Flashing of DC generator means

  creation of residual magnetism by a DC source.
None of these
  increasing flux density by providing extra ampere-turns in field.
 neutralization of residual magnetism.

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Electrical Machines
Torque angle of a synchorous machine operating from a constant voltage bus is usually defined as the space angle between

  Rotor mmf wave and stator mmf wave.
 Stator mmf wave and resultant mmf wave.
 Rotor mmf wave and resultant flux density wave.
 Stator mmf wave and resultant flux density.

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Electrical Machines
The synchronous reactance( Xs) is the

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

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