🔍 Key Concepts

• Cofferdam purpose on a ship and where it is located • Difference between a structural member (like a beam or girder) and an enclosed space • Use of two bulkheads to create a separation space between tanks or compartments

💭 Think About

• Which of these choices sound like parts of the ship’s structure (beams, decks) versus an empty or enclosed space? • Why might a shipbuilder want a small space between two bulkheads, especially near tanks or machinery spaces? What could that space help prevent? • Look at the answers that mention decks or strength members—do those describe a space, or a solid structural piece?

✅ Before You Answer

• Identify which options describe solid strength members (beams, girders, decks) rather than a space or compartment • Recall that a cofferdam is used for separation/isolation between spaces, often tanks—ask which option fits that role • Check which choice specifically involves two bulkheads with a space between them rather than a single piece of structure