🔍 Key Concepts
• Look at the entire structure shown, from the deck level up to the crane jibs, and think of it as a complete "set" rather than a single part.
• Recall that shipboard cranes normally have a fixed base/foundation, a rotating part, and an upper structure or house that carries the booms and machinery.
• Think about how the crane must be able to support weight, rotate, and house machinery, and which named assemblies would logically perform each of those roles.
💭 Think About
• Ask yourself: for this twin crane set, what part is needed to transmit the load safely into the ship’s structure? Which choice corresponds to that?
• What part allows the crane structure to slew (rotate) relative to the base, and which choice names that function?
• Which part contains or supports the machinery and the twin jibs themselves? Does that correspond to one, two, or all of the listed assemblies?
✅ Before You Answer
• Be sure you understand that a foundation is normally the lower, fixed support welded to the deck or structure.
• Confirm that a turntable (slewing ring) is the rotating interface between the fixed foundation and the crane house above.
• Recognize that the crane house assembly is the upper structure that carries the machinery and booms; then decide whether a complete "twin crane set" would reasonably include just that, or all of these assemblies together.