While on watch in the engine room, you are...

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Question 1 of 205eccefa4bacbc34ba4d481d2

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 synchroscope 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?

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🔍 Key Concepts

• Synchronizing lamps method for paralleling alternators (lamp brightness pattern vs. phase relationship) • Relationship between frequency difference and how fast the lamps change from bright to dark • Conditions that must be met before paralleling: voltage, frequency, and phase sequence

💭 Think About

• Think about what it means, electrically, when both lamps are dark, both are bright, or one is bright and one is dark. In which case are the voltages closest to being in phase? • If the incoming alternator is at a slightly higher frequency than the bus, what will you see in the lamps over time, and at which moment is it safest to close the breaker? • How do the two lamps together indicate correct phase sequence vs. simply indicating a frequency or phase difference?

✅ Before You Answer

• Verify which lamp condition (both bright, both dark, or opposite) corresponds to the same phase voltage on both sides of the breaker. • Confirm that the selected condition minimizes current surges and mechanical stress when the breaker closes. • Make sure you understand how the two-lamp (or three-lamp) method distinguishes correct phase sequence from a phase reversal condition.

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