🔍 Key Concepts

• Identify what overall type of distillation/evaporator unit is shown and the general flow: seawater in → brine out → vapor → condensate. • Note the direction of the dashed red and green lines and what they represent (vapor flow vs. liquid flow). • Understand the function of the upper chamber versus the lower chamber, and how non‑condensable gases are normally handled in a distilling unit.

💭 Think About

• Look closely at where section "G" is located and what process is taking place there. Then ask yourself: what must happen to the vapor that leaves "G" and enters "F"? • Trace the path of the cooling medium (through device "I") and see whether it interacts more with section "F" or another part of the unit. • In a typical seawater distiller, where are non‑condensable gases removed: from the area where vapor is formed, or from the area where vapor is being cooled/condensed?

✅ Before You Answer

• Confirm which labeled area (F, G, I) is in direct contact with vapor and which is carrying cooling water inside tubes. • Verify whether section "F" contains tube bundles, spray, or open space, and what that implies about condensation or heating. • Ask: in the section you’re focusing on, is the main action heating seawater, cooling seawater, or condensing vapor and removing non‑condensables? Match that to the best choice.