Electrical Machines
In shunt dc motor the direction of rotation of the motor will reversed. When

  none of above.
  only field terminals are changed.
  either field terminals are reversed or armature terminals are reversed.
  only armature terminals are reversed.

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

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