While underway it is noticed that the main...

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Question 1 of 2066636ef128f7522a1c521adb

While underway it is noticed that the main air ejector is having a hard time maintaining vacuum in the main condenser. When switching to the standby unit the vacuum returns to normal. Which of the following could be a possible cause?

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Question 1 of 20

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🔍 Key Concepts

• Main condenser vacuum and how air leaks or non-condensables affect it • Steam jet air ejector operation: nozzle, suction, discharge, and what happens when performance degrades • Which listed conditions would affect only the online ejector vs. the whole condenser system

💭 Think About

• Ask yourself: if switching to the standby ejector immediately restores normal vacuum, does that point more to a system-wide problem or a problem local to the original ejector? • For each choice, decide whether it would affect just one ejector or both ejectors in the same way. • Think about what happens to an ejector’s ability to remove air and non‑condensables if steam flow to its nozzle is restricted or if there is an extra opening to atmosphere on its suction side.

✅ Before You Answer

• Identify which options would likely affect both air ejectors equally (those are less likely, given the symptom). • For each option, decide if it would directly cause loss of vacuum by adding air/steam load to the condenser or by reducing ejector capacity. • Verify which option describes a fault that could exist on only the in-service ejector line, and would disappear when you switch to the standby unit.

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