| While on watch in the engine room, you are setting up to parallel alternators. The switchboard has a synchroscope and two synchronizing lamps used as a backup means of synchronization. If the synchoscope is broken, which of the steps listed is the most essential before an alternator can be paralleled with the bus, assuming the incoming machine alternator frequency is slightly higher than that of the bus? |
| A) The breaker should be closed when one synchronizing lamp is dark and the other is bright. |
| B) The breaker should be closed when both synchronizing lamps are bright. |
| C) The breaker should be closed when both synchronizing lamps are dark. |
| D) A portable phase sequence indicator must be used to verify the information from the lamps. |
