In all of the above cases
Synchronizing torque will come into operating in these conditions 1. There is a difference in the magnitude of voltages, 2. There is a phase difference in the voltages, 3. There is a frequency difference between the two voltages and Excitation of one of the alternator is changed.
Alternator operates on the principles of
If the prime mover of an alternator supplying load to an infinite bus is suddenly shutdown, then it will