Electrical Machines
In DC generators, electric current to the external circuit from armature is given through

 slip rings.
 commutator.
 solid connection.
 none of above.

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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

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

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