LGTCO/LGTF exit exam questions and answers — Set 3 — Liquefied Gas Tanker Cargo Operations
Set 3 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 3 — 30 LGTCO/LGTF exit exam questions with answers
1. When the over-pressure of an airlock or gas-safe space is lost:
- A. All electrical equipment that is not of a certified safe type should be de-energized
- B. All electrical equipment that is of a certified safe type should be de-energized
- C. All electrical equipment should continue running without interruption
- D. All electrical equipment, both certified and non-certified, must be de-energized immediately
2. Segregation, separation and airlocks are fundamental to the safety of:
- A. Oil tankers
- B. Gas tankers
- C. Chemical tankers
- D. Container ships
3. Can LNG and LPG be used as fuel in a ship's engine room?
- A. Only LPG can be used
- B. Only LNG can be used
- C. Yes, both can be used under relevant IGF/IGC Code requirements
- D. No, none can be used
4. List the dryers used with an Inert Gas Generator on gas ships to dry the inert gas generated:
- A. Refrigerated drier and absorption (desiccant) drier
- B. Only refrigerated dryer
- C. Only absorption dryer
- D. None of the above; only demister pads are used
5. Can cargo be loaded if the MSDS (Material Safety Data Sheet) for the cargo is not supplied by the shipper or terminal?
- A. Yes, if cargo details are verbally communicated
- B. No, cargo must not be loaded without the official MSDS
- C. Yes, it does not make a difference
- D. Yes, provided the vessel has loaded similar cargo before
6. What is the atmospheric boiling point of Methane?
- A. -0.5°C
- B. -104°C
- C. -161.5°C
- D. -41.5°C
7. What is the atmospheric boiling point of Butane (n-Butane)?
- A. -0.5°C
- B. -42°C
- C. -88.6°C
- D. -104°C
8. What is the vapour relative density of Methane? (Air = 1)
- A. 1.058
- B. 0.554
- C. 1.55
- D. 2.09
9. What is the vapour relative density of Propane? (Air = 1)
- A. 0.554
- B. 1.55
- C. 0.20
- D. 0.80
10. What is the vapour relative density of n-Butane? (Air = 1)
- A. 0.90
- B. 2.09
- C. 2.60
- D. 1.70
11. What is the operation carried out prior to cooling down the tanks on fully refrigerated liquefied gas carriers?
- A. Gassing up
- B. Inerting
- C. Aerating
- D. Gas freeing
12. What is the operation carried out prior to gassing up the tanks on liquefied gas carriers?
- A. Gas freeing
- B. Aerating
- C. Cooling down
- D. Inerting
13. What is the vapour relative density of Chlorine? (Air = 1)
- A. 2.00
- B. 2.49
- C. 1.55
- D. 0.55
14. Requirement for cargo tank entry with respect to tank atmosphere check of hydrocarbon content:
- A. Hydrocarbon content must be more than 10% LFL
- B. Hydrocarbon content must be less than 1% LFL
- C. Hydrocarbon content must be above the UFL
- D. Hydrocarbon content must be between LFL and UFL
15. What is the auto-ignition temperature of Ethylene Oxide?
- A. 452°C
- B. 509°C
- C. 429°C
- D. 396°C
16. What is the auto-ignition temperature of Propylene Oxide?
- A. 465°C
- B. 509°C
- C. 416°C
- D. 396°C
17. What is the critical pressure of Propane in bars absolute?
- A. 38.1 bar absolute
- B. 42.6 bar absolute
- C. 50.2 bar absolute
- D. 46.2 bar absolute
18. What is the critical pressure of n-Butane in bars absolute?
- A. 38.1 bar absolute
- B. 42.6 bar absolute
- C. 52.6 bar absolute
- D. 32.2 bar absolute
19. What is the critical pressure of Methane in bars absolute?
- A. 50.3 bar absolute
- B. 34.3 bar absolute
- C. 44.7 bar absolute
- D. 65.2 bar absolute
20. What is known as Inert Gas?
- A. Non-flammable gases containing insufficient oxygen to support combustion
- B. Flammable gas with concentration between LEL and UFL limits
- C. Flammable gas with concentration above UFL limits
- D. Toxic gas having concentration percentage below TLV-TWA
21. What is the critical pressure of Ethylene in bars absolute?
- A. 46.2 bar absolute
- B. 38.8 bar absolute
- C. 50.5 bar absolute
- D. 42.6 bar absolute
22. An LNG fire is classified under which class of fire in maritime STCW standards?
- A. Class A fire
- B. Class B fire
- C. Class C fire
- D. Class D fire
23. Which fixed fire-fighting system is mandatory for fire-fighting on the cargo deck of a liquefied gas carrier?
- A. Fixed low-expansion foam system
- B. Fixed dry chemical powder (DCP) system
- C. Fixed CO2 flooding system
- D. Fixed wet chemical fire-fighting system
24. What should crew members do immediately when the ship's General Emergency Alarm sounds?
- A. Wear PPE, lifejacket, carry immersion suit and go to the navigation bridge
- B. Wear PPE, lifejacket, carry immersion suit and go to the engine control room
- C. Wear PPE, lifejacket, carry immersion suit and proceed to the forecastle
- D. Wear PPE, lifejacket, carry immersion suit and proceed to the designated Muster Point as per the Ship's Muster List
25. What is Critical Temperature?
- A. The temperature above which a gas cannot be liquefied by pressure alone
- B. The temperature at which a gas changes state to liquid at atmospheric pressure
- C. The temperature at which a gas becomes superheated
- D. The temperature at which liquefied gas changes from liquid to gas during boiling
26. What is Flammable Range?
- A. A mixture of flammable gas in air whose gas percentage is above the UFL
- B. The range of hydrocarbon vapor concentration in air between the LFL and UFL capable of burning
- C. A mixture of flammable gas in air whose gas percentage is below the LFL
- D. A gas mixture whose concentration is strictly between 0% and 10% LFL
27. What is Flash Point?
- A. The lowest temperature at which a liquid ignites spontaneously without a spark
- B. The lowest temperature at which a liquid gives off sufficient vapour to form an ignitable mixture with air near its surface
- C. The temperature at which a boiling liquid expanding vapor explosion (BLEVE) takes place
- D. The lowest temperature required for self-sustained spontaneous combustion
28. The ship's General Emergency Alarm signal is defined as:
- A. Three long blasts on the ship's whistle and general alarm bells
- B. Seven or more short blasts followed by one long blast on the ship's whistle and bells
- C. Continuous sounding of the ship's whistle for more than 2 minutes
- D. One continuous long blast followed by two short blasts
29. What operation is done on fully refrigerated gas carriers before loading liquid cargo?
- A. Gassing up
- B. Cooling down
- C. Inerting
- D. Aerating
30. What operation is done on fully refrigerated gas carriers before gassing up after drydock?
- A. Drying only
- B. Inerting
- C. Cooling down
- D. Aerating
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