Electrical Machines
In Ward-Leonard system, the lower limit of the speed imposed by

 Field resistance.
 Armature resistance.
 None of above.
 Residual magnetism of the generator.

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

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