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

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Electrical Machines
With the increase in speed of a DC motor

 back emf falls and line current increases.
 both back emf as well as line current increase.
 both back emf as well as line current fall.
 back emf increases but line current falls.

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