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

 decrease.
 remains constant.
 increase.
None of these

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Electrical Machines
In a DC machine the armature mmf is

  stationary with respect to field poles.
  stationary with respect to armature.
 rotating with respect to field poles.
  rotating with respect to field poles as well as armature.

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

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