The synchronous speed would be the same for a four-pole generator no matter if it operates at 50 or 60 Hz.

Question

Quizplus · Accepted Answer

The synchronous speed of a generator is determined by the formula $N_s = \frac{120f}{P}$, where $N_s$ is the synchronous speed in revolutions per minute (rpm), $f$ is the frequency in hertz (Hz), and $P$ is the number of poles. Therefore, changing the frequency while keeping the number of poles constant will change the synchronous speed.

The Synchronous Speed Would Be the Same for a Four-Pole