Question 1 Remove Topic Question Text What is an important operational difference between a VLEC and a conventional VLGC? Explanation VLECs are arranged for low-temperature ethane service, so cargo containment and vapour handling arrangements differ from typical VLGC service. Option 1 Remove Option 2 Remove Option 3 Remove Option 4 Remove Add Option
Question 2 Remove Topic Question Text What best describes the Mark III containment system used on membrane gas carriers? Explanation Mark III is a membrane containment concept in which the thin primary barrier is supported by insulation and the hull structure. Option 1 Remove Option 2 Remove Option 3 Remove Option 4 Remove Add Option
Question 3 Remove Topic Question Text What is a key distinction between an independent Type B/SPB tank and a membrane tank? Explanation Independent tanks are structurally self-supporting, while membrane systems depend on the ship structure and insulation spaces for support and monitoring. Option 1 Remove Option 2 Remove Option 3 Remove Option 4 Remove Add Option
Question 4 Remove Topic Question Text Which statement about ethane is correct? Explanation Ethane is not relied on for smell-based warning and primarily presents flammability, asphyxiation, and cryogenic hazards. Option 1 Remove Option 2 Remove Option 3 Remove Option 4 Remove Add Option
Question 5 Remove Topic Question Text What does the critical temperature of a gas mean? Explanation Critical temperature is fundamental to understanding whether a cargo can be liquefied by pressure without additional cooling. Option 1 Remove Option 2 Remove Option 3 Remove Option 4 Remove Add Option
Question 6 Remove Topic Question Text What is the flammable range of ethane in air? Explanation Ethane becomes flammable only within its flammable range, so atmosphere control aims to remain safely outside it. Option 1 Remove Option 2 Remove Option 3 Remove Option 4 Remove Add Option
Question 7 Remove Topic Question Text What is the auto-ignition temperature of ethane? Explanation Knowing the auto-ignition temperature helps operators assess ignition risk around hot surfaces. Option 1 Remove Option 2 Remove Option 3 Remove Option 4 Remove Add Option
Question 8 Remove Topic Question Text Ethane can react dangerously with which substance? Explanation Chlorine compatibility is a known hazard and must be considered in cargo segregation and emergency response. Option 1 Remove Option 2 Remove Option 3 Remove Option 4 Remove Add Option
Question 9 Remove Topic Question Text What typically happens when a light ethane-type cryogenic cargo is spilled on water? Explanation The large temperature difference drives violent boiling and rapid vapour generation. Option 1 Remove Option 2 Remove Option 3 Remove Option 4 Remove Add Option
Question 10 Remove Topic Question Text What is rapid phase transition in cryogenic cargo handling? Explanation Rapid phase transition is a physical explosion effect, not a combustion reaction. Option 1 Remove Option 2 Remove Option 3 Remove Option 4 Remove Add Option
Question 11 Remove Topic Question Text Why are ordinary carbon steels unsuitable for ethane cargo containment at cryogenic temperature? Explanation Cryogenic service requires materials that retain toughness at very low temperature. Option 1 Remove Option 2 Remove Option 3 Remove Option 4 Remove Add Option
Question 12 Remove Topic Question Text Why does a visible white cloud often form around a cold cargo vapour release? Explanation The cloud is usually condensed water vapour from the atmosphere rather than the cargo itself. Option 1 Remove Option 2 Remove Option 3 Remove Option 4 Remove Add Option
Question 13 Remove Topic Question Text What oxygen concentration is a common best-practice target when inerting cargo tanks? Explanation A very low oxygen content provides a safety margin before cargo vapour is introduced. Option 1 Remove Option 2 Remove Option 3 Remove Option 4 Remove Add Option
Question 14 Remove Topic Question Text What dew point target is typically required before ethane operations? Explanation A very dry atmosphere is needed to prevent ice formation and contamination in cryogenic systems. Option 1 Remove Option 2 Remove Option 3 Remove Option 4 Remove Add Option
Question 15 Remove Topic Question Text What positive pressure should be maintained in hold spaces during inerting? Explanation A slight positive inert gas pressure helps prevent air ingress to protected spaces. Option 1 Remove Option 2 Remove Option 3 Remove Option 4 Remove Add Option
Question 16 Remove Topic Question Text How many tank volumes does the displacement method typically require? Explanation Displacement is more efficient than dilution when a good piston effect can be maintained. Option 1 Remove Option 2 Remove Option 3 Remove Option 4 Remove Add Option
Question 17 Remove Topic Question Text When inerting an air-filled tank by displacement with nitrogen, where should nitrogen normally be introduced? Explanation Correct inlet and outlet positioning helps maintain a piston effect and reduces mixing. Option 1 Remove Option 2 Remove Option 3 Remove Option 4 Remove Add Option
Question 18 Remove Topic Question Text A flammable vapour and air mixture must never be passed through which item of cargo machinery? Explanation Passing flammable air-vapour mixtures through cargo compressors creates an unacceptable ignition risk. Option 1 Remove Option 2 Remove Option 3 Remove Option 4 Remove Add Option
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