Electrical Machines
In a transformer operating at constant voltage if the input frequency increases, the core loss

None of these
 remains constant.
 decrease.
 increase.

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

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