In preparation for paralleling generators, if the electric plant condition is as shown by graph "A", what would be the rotational status of the synchronizing lamps as shown in circuit "B"? Illustration EL-0002

Correct Answer: Option B — Revolve slowly in the fast direction.

Synchronizing lamps connected across the open contacts of a paralleling circuit rotate in speed and direction proportional to frequency and phase differences. Graph A conditions indicate a slight frequency mismatch, causing the synchroscope or synchronizing lamps to revolve slowly in the fast direction.