LGTCO/LGTF Exit Exam • Set 5 Question 1 of 30

What are Gas Hydrates in liquefied gas operations?

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Direct Answer

Option B: Solid crystalline compounds formed by the interaction of water and hydrocarbon gas at specific temperatures and pressures

Gas hydrates are solid, ice-like crystalline compounds formed when free water molecules trap light hydrocarbon molecules under elevated pressure and low temperatures, risking pipe and valve blockages.

All Options

A white powdery substance produced by the reaction of ammonia with carbon dioxide

Solid crystalline compounds formed by the interaction of water and hydrocarbon gas at specific temperatures and pressures (Correct Answer)

Compounds formed by the chemical combination of cargo liquid with atmospheric oxygen

Polymerized chains of unsaturated alkene molecules

Detailed Explanation & Context

Relevant Framework: STCW 2010 Manila Amendments • DG Shipping E-Learning & Exit Exam Standards • Liquefied Gas Tanker Cargo Operations (LGTCO/LGTF).

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Q1 What are Gas Hydrates in liquefied gas operations? Q2 What are Peroxides in chemical and gas cargo handling? Q3 Liquefied gas cargo tank contents are bounded directly by the: Q4 A device used to determine the liquid-vapour interface during the ullaging of semi-pressurized and fully pressurized tanks is a: Q5 Which of the following is an example of a closed gauging system that does not penetrate the cargo tank shell? Q6 Where on a firefighter wearing SCBA is the fireproof 30-metre lifeline attached? Q7 Which of the following is a solid desiccant medium that dries gas by adsorption of water molecules? Q8 The temperature at which condensation will take place within a gas mixture if further cooling occurs is known as: Q9 A gauging system employing a device which penetrates the tank and which, when in use, permits a small quantity of cargo vapour or liquid to escape to atmosphere is known as: Q10 Float gauges installed on liquefied gas tankers are an example of which gauging category?