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LGTCO/LGTF exit exam questions and answers — Set 1

Set 1 of the Liquefied Gas Tanker Cargo Operations (LGTCO/LGTF) exit exam bank — 30 of 159 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
Answer: D — Basic Training for Liquefied Gas Tanker Cargo Operations
LGTF provides basic STCW V/1-2 training for gas carrier personnel.

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
Answer: C — LNG (Liquefied Natural Gas) and LPG (Liquefied Petroleum Gas)
LNG (mostly Methane) and LPG (Propane, Butane, Ammonia) represent the main gas trades.

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
Answer: C — Extremely low temperatures below -50°C (e.g. LNG at -162°C)
Cryogenic liquids exist at ultra-low temperatures requiring special alloy metallurgy.

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
Answer: A — Severe frostbite / Cold thermal burns
Cryogenic liquids freeze body tissue instantly, causing severe frostbite burns.

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
Answer: A — Rapid boiling and phase change into large gas vapor clouds
Cryogenic liquid absorbs heat from sea water, expanding rapidly into gas clouds.

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
Answer: A — High pressure inside Type C pressure vessel tanks (~18 bar)
Pressurized LPG carriers hold cargo at ambient temp under high pressure (~18 bar).

7. What gas detector measures low levels of flammable gas in air?

  • A. Hydrometer
  • B. Salinometer
  • C. Explosimeter (Combustible Gas Indicator)
  • D. Thermocouple
Answer: C — Explosimeter (Combustible Gas Indicator)
Explosimeters measure flammable gas concentrations as % LEL.

8. What code sets international safety standards for gas carrier construction?

  • A. IBC Code
  • B. IMDG Code
  • C. IGC Code
  • D. IMSBC Code
Answer: C — IGC Code
The International Gas Carrier (IGC) Code governs gas ship design and operation.

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
Answer: A — Approximately 1 : 600
1 volume of liquid LNG expands into ~600 volumes of methane gas at ambient conditions.

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
Answer: C — Water spray curtain system
Water spray curtains provide heat shielding and warm up spilled gas liquid.

11. Under STCW Code Table A-V/1-2, what is the mandatory requirement regarding regulatory compliance and STCW code requirements during Advanced Liquefied Gas Operations operations?

  • A. Strict compliance with approved safety procedures and flag state regulations
  • B. Applicable only during drydock operations
  • C. Verbal recommendation without documentation
  • D. Optional adherence based on vessel size
Answer: A — Strict compliance with approved safety procedures and flag state regulations
STCW Code Table A-V/1-2 mandates strict compliance with approved safety protocols for Advanced Liquefied Gas Operations.

12. What specific safety precaution must be observed when managing regulatory compliance and STCW code requirements for Advanced Liquefied Gas Operations on board?

  • A. Conducting a thorough risk assessment and briefing all involved personnel prior to starting work
  • B. Delegating tasks exclusively to untrained crew members
  • C. Proceeding without informing the officer on watch
  • D. Disabling automated safety alarms to save time
Answer: A — Conducting a thorough risk assessment and briefing all involved personnel prior to starting work
Risk assessments and pre-job briefings ensure all team members understand hazards during Advanced Liquefied Gas Operations operations.

13. 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
Answer: C — Insulated cryogenic gloves, face shield, safety boots, and full coveralls
Cryogenic gloves and face protection guard against cold liquid sprays and frostbite.

14. 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
Answer: C — Inert gas or Nitrogen (N2)
Inerting reduces oxygen concentration below 5% to prevent flammable mixtures.

15. 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
Answer: D — Vapor generated continuously due to heat ingress through tank insulation
BOG forms constantly as cryogenic liquid absorbs small amounts of heat.

16. 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
Answer: B — Hydraulic expansion pressure rise bursting the pipe line
Warming liquid gas expands immensely; thermal relief valves prevent pipe rupture.

17. 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
Answer: D — Stop pumps/compressors and close ESD manifold valves in emergency
ESD systems isolate cargo lines within 30 seconds of emergency trip activation.

18. 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
Answer: C — Severe toxicity, respiratory irritation, skin burns, and suffocating odor
Ammonia is toxic, reactive with copper, and corrosive to human tissue.

19. 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
Answer: B — Dry Chemical Powder (DCP)
DCP is specified under IGC Code as primary extinguishing agent for gas fires.

20. What device measures tank insulation space gas leaks?

  • A. Thermometer
  • B. Continuous gas sampling and differential pressure monitoring system
  • C. Sounding tape
  • D. Salinometer
Answer: B — Continuous gas sampling and differential pressure monitoring system
Hold spaces and insulation layers are continuously sampled for trace gas leakage.

21. 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
Answer: B — Cold methane is heavier than air initially, forming low flammable vapor clouds
Cold methane gas (-162°C) is denser than air and stays low until warmed.

22. 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
Answer: A — Immerse in warm water bath (40°C - 42°C); DO NOT rub
Warm water rewarming (40-42°C) restores circulation without causing tissue damage.

23. Which international regulation specifies the minimum standard for regulatory compliance and STCW code requirements concerning Advanced Liquefied Gas Operations?

  • A. Port State Control advisory note only
  • B. International Load Line Certificate Annex 3
  • C. STCW Code Section A-V/1-2 and relevant SOLAS/MARPOL conventions
  • D. Tonnage Measurement Convention 1969
Answer: C — STCW Code Section A-V/1-2 and relevant SOLAS/MARPOL conventions
STCW Code Section A-V/1-2 sets international standards for training and operational competency in Advanced Liquefied Gas Operations.

24. In the event of an emergency involving regulatory compliance and STCW code requirements during Advanced Liquefied Gas Operations tasks, what immediate action is required?

  • A. Attempt to resolve the incident silently without raising the alarm
  • B. Wait until the end of the watch to log the issue
  • C. Evacuate the vessel immediately without informing the bridge
  • D. Raise the alarm, notify the Officer of the Watch, and execute assigned muster list duties
Answer: D — Raise the alarm, notify the Officer of the Watch, and execute assigned muster list duties
Prompt alarm activation ensures emergency response teams can mobilize immediately.

25. 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
Answer: B — Compress and cool boil-off gas, returning it as liquid to cargo tanks
Reliquefaction units condense BOG back into liquid LPG to control tank pressure.

26. 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
Answer: C — Moss Rosenberg spherical system
Moss spheres are independent Type B tanks recognized by spherical domes.

27. 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
Answer: C — SIGTTO / ISGOTT Ship-Shore Safety Checklist
The Ship-Shore Safety Checklist ensures manifold, ESD, and fire systems are verified.

28. What is the Lower Explosive Limit (LEL) of Methane gas in air?

  • A. 0.1%
  • B. 50%
  • C. 20%
  • D. Approximately 5% by volume
Answer: D — Approximately 5% by volume
Methane becomes flammable in air starting at 5% volume concentration (LEL).

29. 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
Answer: D — Thermal shock cracking of tank metal bulkheads and pipe joints
Rapid uneven cooling causes high thermal stresses leading to structural metal fractures.

30. 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
Answer: A — Emergency Release Coupling (ERC) / PERS
PERS/ERC isolates and uncouples loading arms instantly during emergency breakaway.

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