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

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Electrical Machines
The speed of a DC series motor is

 Proportional to the armature current.
 Proportional to field current.
 Proportional to the square of the armature current.
 Inversely proportional to the armature current.

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