A three-phase synchronous motor is made to operate at no-load, with field excitation. Assuming no losses are present under this condition, what is the phase difference between the supply voltage and back EMF?

A synchronous motor is operating with constant field excitation. When the mechanical load on the motor is increased, what will be the immediate effect on the motor's operation?

The maximum torque that a synchronous motor can develop at rated voltage and frequency without losing its synchronism is known as: