LGTCO/LGTF exit exam questions and answers — Set 1 — Liquefied Gas Tanker Cargo Operations
Set 1 of the Liquefied Gas Tanker Cargo Operations (LGTCO/LGTF) exit exam bank — 30 of 599 questions, with the correct option marked and a one-line explanation for every one. Read it end to end, jump to a single set, or search it — then sit the same bank as a timed paper. The real DG Shipping exit exam is 30 marks with 15 to pass.
These are the bank's original groupings. Practising deals the whole bank out again every time you reshuffle, so a practice “Set 3” is a different 30 questions each time — the set numbers below are the source file's, and are only used here so the key stays navigable. Options are listed in their original order with fixed letters; when you practise, those move too.
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Set 1 — 30 LGTCO/LGTF exit exam questions with answers
1. What does LGTF stand for in maritime STCW training?
- A. Low Temp Facility
- B. Liquid Gas Fleet
- C. Gas Tanker Firefighting
- D. Basic Training for Liquefied Gas Tanker Cargo Operations
2. What are the two main categories of liquefied gas cargoes carried in bulk?
- A. Water and Palm Oil
- B. HFO and Diesel
- C. LNG (Liquefied Natural Gas) and LPG (Liquefied Petroleum Gas)
- D. Crude and Bitumen
3. What is cryogenic temperature range in gas shipping?
- A. 0°C
- B. Ambient +20°C
- C. Extremely low temperatures below -50°C (e.g. LNG at -162°C)
- D. Above +100°C
4. What injury occurs if human skin contacts cryogenic liquid gas?
- A. Severe frostbite / Cold thermal burns
- B. Sunburn
- C. Skin tanning
- D. Heat stroke
5. What happens to liquid gas if spilled onto seawater?
- A. Rapid boiling and phase change into large gas vapor clouds
- B. Sinks as solid rock
- C. Dissolves into salt
- D. Turns into diesel
6. How is LPG maintained liquid at ambient temperature in pressurized ships?
- A. High pressure inside Type C pressure vessel tanks (~18 bar)
- B. Mixing with sand
- C. Steam heating
- D. Adding salt
7. What gas detector measures low levels of flammable gas in air?
- A. Hydrometer
- B. Salinometer
- C. Explosimeter (Combustible Gas Indicator)
- D. Thermocouple
8. What code sets international safety standards for gas carrier construction?
- A. IBC Code
- B. IMDG Code
- C. IGC Code
- D. IMSBC Code
9. What is the liquid-to-gas expansion ratio of LNG when vaporized at atmospheric pressure?
- A. Approximately 1 : 600
- B. 1 : 2
- C. 1 : 10
- D. 1 : 10000
10. What safety system protects ship structure from cryogenic liquid leaks on deck?
- A. Foam blanket
- B. Steam barrier
- C. Water spray curtain system
- D. Air curtain
11. What PPE is required when connecting cryogenic cargo hoses?
- A. Raincoat
- B. Bare hands
- C. Insulated cryogenic gloves, face shield, safety boots, and full coveralls
- D. Cotton gloves
12. What gas is used to purge oxygen from cargo tanks before loading gas?
- A. Compressed air
- B. Oxygen
- C. Inert gas or Nitrogen (N2)
- D. Carbon monoxide
13. What is boil-off gas (BOG)?
- A. Boiler steam
- B. Compressed air
- C. Engine exhaust
- D. Vapor generated continuously due to heat ingress through tank insulation
14. What risk occurs if liquid gas is trapped between two closed line valves?
- A. Vacuum formation
- B. Hydraulic expansion pressure rise bursting the pipe line
- C. Permanent freezing
- D. Pipe color change
15. What is the function of an Emergency Shutdown (ESD) system on gas carriers?
- A. Drop anchor
- B. Open tank lids
- C. Turn off lights
- D. Stop pumps/compressors and close ESD manifold valves in emergency
16. What gas property makes Ammonia (NH3) hazardous to crew?
- A. Odorless and sweet
- B. Inert behavior
- C. Severe toxicity, respiratory irritation, skin burns, and suffocating odor
- D. Heavy soot
17. What fire extinguisher type is installed on gas carrier cargo decks?
- A. Foam monitors only
- B. Dry Chemical Powder (DCP)
- C. Sand buckets
- D. Soda-acid
18. What device measures tank insulation space gas leaks?
- A. Thermometer
- B. Continuous gas sampling and differential pressure monitoring system
- C. Sounding tape
- D. Salinometer
19. What is the danger of cold methane gas clouds near deck level?
- A. Non-flammable
- B. Cold methane is heavier than air initially, forming low flammable vapor clouds
- C. Floats to space instantly
- D. Turns to water drops
20. What first aid treatment is given for cryogenic frostbite on hands?
- A. Immerse in warm water bath (40°C - 42°C); DO NOT rub
- B. Apply grease
- C. Hold near open fire
- D. Rub with snow
21. What is the function of cargo reliquefaction plants on LPG tankers?
- A. Vent gas into ocean
- B. Compress and cool boil-off gas, returning it as liquid to cargo tanks
- C. Burn BOG in boilers
- D. Convert LPG to diesel
22. What containment system uses self-supporting spherical aluminum tanks?
- A. Gaztransport membrane
- B. Technigaz Mark III
- C. Moss Rosenberg spherical system
- D. Flat bottom tank
23. What safety checklist must be completed before gas cargo operations?
- A. Bill of Lading
- B. Custom Manifest
- C. SIGTTO / ISGOTT Ship-Shore Safety Checklist
- D. Passenger List
24. What is the Lower Explosive Limit (LEL) of Methane gas in air?
- A. 0.1%
- B. 50%
- C. 20%
- D. Approximately 5% by volume
25. What risk is associated with sudden temperature drop during cargo tank cool-down?
- A. Paint peeling
- B. Rust growth
- C. Short circuit
- D. Thermal shock cracking of tank metal bulkheads and pipe joints
26. What device stops cargo flow automatically if loading arms move beyond safe limits?
- A. Emergency Release Coupling (ERC) / PERS
- B. Non-return flap
- C. Hand valve
- D. Butterfly valve
27. What is the role of Nitrogen padding in gas shipping?
- A. Clean deck
- B. Warm up cargo
- C. Increase density
- D. Maintain positive dry inert gas pressure over cargo or insulation spaces
28. What instrument measures oxygen content in gas samples?
- A. Explosimeter
- B. Hygrometer
- C. Barometer
- D. Paramagnetic or Electrochemical Oxygen Analyzer
29. What is the purpose of deck water spray curtains during gas leaks?
- A. Knock down gas clouds, cool structural steel, and shield radiant heat
- B. Fill drinking tanks
- C. Clean anchor chain
- D. Wash windows
30. Who oversees gas cargo watchkeeping and manifold transfers on board?
- A. Deck Cadet
- B. Steward
- C. Chief Cook
- D. Chief Officer / Designated Cargo Officer
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