While paralleling two alternators, the...

While paralleling two alternators, the...

Question 1 of 270705eccefa4bacbc34ba4d481d0

While paralleling two alternators, the synchronizing lamps remain lit as the synchroscope pointer approaches the 0°. What would this indicate?

Question 1 of 27070

Q

While paralleling two alternators, the synchronizing lamps remain lit as the synchroscope pointer approaches the 0°. What would this indicate?

🔍 Key Concepts

• Paralleling alternators: what electrical conditions must match before closing the breaker • Synchronizing lamps and synchroscope: what each one actually indicates • Difference between voltage, frequency, and phase sequence/angle when synchronizing

💭 Think About

• Ask yourself: when the synchroscope pointer is at 0°, what is it telling you about the phase relationship of the two machines? • If the lamps stay bright instead of going dark at 0°, what does that say about the actual phase relationship between the systems? • Which of the answer choices describes a condition that would make the synchroscope indication unreliable even if the pointer appears correct?

✅ Before You Answer

• Review what dark lamps vs bright lamps mean during synchronization with three-lamp method • Confirm what condition must exist for the lamps to all go dark at the same instant as the synchroscope reaches 0° (in phase) • Think about whether speed (frequency), voltage, or power factor changes would keep the lamps lit continuously at the 0° indication