Which intermodal type corresponds to SPEC 51?

• A. IM-101
• B. IM-102
• C. SPEC 51
• D. IMO TYPE 7

Answer: (C)

The main idea is recognizing intermodal tank design designations. SPEC 51 is itself a specific intermodal tank type used in North America for transporting liquids; it’s a non-pressurized intermodal tank design that has its own approved construction and fittings. When asked which intermodal type corresponds to SPEC 51, the correct match is SPEC 51 itself, because this designation uniquely identifies that particular tank design. The other options refer to different intermodal designs (IM-101 and IM-102 are other North American non-pressurized tank types, while IMO Type 7 is a marine/intermodal tank used for international sea shipments). So the label SPEC 51 maps to SPEC 51, not to the other designations.