Electrical Machines
Which of the following is/are effects of armature reaction?

All of these
 increases the design cost
 increase the maintenance and repair
 increase the iron loss

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

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