🔍 Key Concepts

• Function of the main condenser air ejector in a steam plant • Effect of air leaks and non-condensable gases on condenser performance • Relationship between air ejector nozzle condition, steam flow, and condenser vacuum

💭 Think About

• How does scale in the ejector nozzle affect the flow of steam through that nozzle? Think about whether this tends to increase or decrease steam velocity and mass flow. • If the air ejector is less effective at removing air and non‑condensables, what happens inside the condenser: to pressure, temperature, and heat transfer? • Which of the listed options is most directly tied to the performance of the air ejector, rather than being only an indirect or secondary effect?

✅ Before You Answer

• Verify which choice is most directly connected to condenser air removal efficiency. • Check how a change in condenser vacuum would influence turbine exhaust temperature and condensing temperature, and decide which of those is primary vs secondary. • Confirm in your mind that scale in a nozzle usually causes reduced flow capacity and think about what that does to the ejector’s ability to remove air.