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

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Electrical Machines
In a synchronous generator with constant steam input supplies power to an infinite bus at a lagging power factor. If the excitation is increased

 power angle decrease and power factor increase
 both power angle and power factor increase
 both power angle and power factor decrease
 power angle increase and power factor decrease

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Electrical Machines
A belt-driven cumulatively-compound dc generator is delivering power to the dc mains. If the Belt snaps then the machine will run as a

 differentially compounded motor in the opposite direction
 cumulative compounded motor in opposite direction
 cumulative compounded motor in the same direction
 differentially compounded motor in the same direction

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