A __________ cargo tank has an inner tank with an outer shell, and is well insulated.

• A. Cryogenic
• B. Non-cryogenic
• C. Pressurized
• D. Ambient

Answer: (A)

The question is testing knowledge of cryogenic cargo tank design. Cryogenic tanks are built with a double-wall structure: an inner tank that actually holds the extremely cold liquid, and an outer shell with a space between them that is highly insulated. That insulation (often a vacuum or multilayer insulation) minimizes heat transfer from the surroundings, keeping the contents at very low temperatures and reducing boil-off. This kind of well-insulated, double-walled construction is characteristic of cryogenic equipment used for liquefied gases like LNG, oxygen, or nitrogen. Other types—non-cryogenic or ambient—don’t rely on this inner-outer, highly insulated arrangement for maintaining such low temps, and while some pressurized tanks may have insulation, the defining feature described aligns with cryogenic design.