GASCO exit exam questions and answers — Set 5 — Advanced Training for Liquefied Gas Tanker Cargo Operations
Set 5 of the Advanced Training for Liquefied Gas Tanker Cargo Operations (GASCO) exit exam bank — 30 of 710 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 5 — 30 GASCO exit exam questions with answers
1. How is BOIL OFF gas generated
- A. Evaporation
- B. Heat ingress
- C. Drop in pressure
- D. All of the abov
2. Which of the following can lead to major leak of insulation spaces?
- A. Due to hair line cracks inside membranee.
- B. Due to significant fatigue cracks on welds of cargo tank membranees
- C. The gradual increase of methane content inside the insulation spac
- D. Due to accidentally tripped of both HD and LD compressors
3. Which of the following equipment is not used to lift an auxiliary cargo pump?
- A. Electrical connection box
- B. Chain block
- C. Overhead railing
- D. Manifold spool piece derrick
4. What will happen to the liquid level within and pressure of a cargo tank when there is a big crack (major leak) in the cargo tank's primary membrane and adjacent insulation space, underneath the cargo level?
- A. The liquid level will increase and pressuree will suddenly increas
- B. The liquid level will drop and pressuree will suddenly drop
- C. The liquid level will drop and pressuree will suddenly ris
- D. The liquid level will increase and pressuree will be suddenly drop
5. In the event of major LNG spill which of the following action should not to be taken?
- A. Stop cargo operation
- B. Inject cargo line with CO2, without stopping the cargo operation
- C. Close all accommodation doors and ventilation fans
- D. Start the deck water spray (or IMO) pump
6. What is the method used to prevent any further lowering of the hull steel temperature due to damaged insulation?
- A. By flooding the ballast tanks with CO2 around the affected cargo tank
- B. By sending ship's crew to scaling off the ice formed on the surfaces of the hull steel
- C. By injecting nitrogen gas inside the ballast tanks around the affected cargo tank
- D. By flooding ballast tanks with sea water around any affected cargo tank
7. Which is the melting point temperature of the ESDS automatic fusible element normally fitted onboard?
- A. Between 200°C to 206°C
- B. Between 50°C to 55°C
- C. Between 72°C to 78°C
- D. Between 98°C to 104°C
8. Identify the odd one. Onboard an LNG tanker with NO 96 containment system, which of the following is not a typical early indication of a major cargo leak into the insulation spaces?
- A. There will be a rapid increase of methane content in affected areas
- B. Relief valve for the affected primary space may lift
- C. Inner hull temperature will drop in affected areas
- D. There will be cold spots at the ship side close to the affected area
9. Which of the following portable gas meters is used to monitor methane content during the inerting operation prior aerating?
- A. M2 test tub
- B. Hygrometer
- C. Oxygen meter
- D. Gas scop
10. Onboard a membrane class LNG tanker, during purging cargo tanks with LNG, where is the sampling point for taking the gas readings?
- A. Vaporiser outlet sample cock
- B. Heater outlet sample cock
- C. Vapor line sample cock
- D. At cargo tank loading line sample cock
11. Onboard an LNG tanker, why is forced boil - off required out during loaded passage?
- A. To maintain cargo tank pressurees
- B. To maintain cargo tank temperatures
- C. To maintain cold temperature at the tripod mast
- D. To supplement fuel supply to the main propulsion plant
12. If there is an interruption at the end of cooldown before loading, what is the recommended measure to be taken?
- A. To stop cooldown completely and open loading valv
- B. To stop cooldown and close the vapor manifold
- C. To start own spray pump and cool down
- D. To continue cooldown process until the tank bottom close to -160°C.
13. Can ballast operations take place during custody transfer measurement?
- A. Yes, ballasting should be done to maintain even keel
- B. Ship should be maintained upright by ballasting
- C. No; all ballast operations should be suspended
- D. There are no restrictions on ballast operations
14. What is the medium used for inerting cargo tanks?
- A. Oxygen
- B. Inert gas
- C. Dry air
- D. Methan
15. What is the main reason for a membrane class LNG tanker to retain a small quantity of cargo ("heel") during ballast passage?
- A. To ensure easy starting of cargo pump at loading port
- B. To reduce the consumption of heavy fuel oil on passage
- C. To avoid bottom of the cargo tank come into contact with oxygen
- D. For cold maintenance of the cargo tanks
16. Which equipment Is used for evacuating the Insulation spaces?
- A. Vacuum pumps
- B. HD blowers
- C. LD blowers
- D. Water ballast ejector
17. Safety is dependent on orderliness and cleanliness. Order may be maintained by______.
- A. storing items in their assigned plac
- B. storing all items in a common storage container except those ready-for-sea
- C. tagging all items according to their age and then storing them together
- D. disposing of used items
18. Oxygen in the atmosphere of the tank is used up when iron is converted into oxides during the corrosion process. ---------------i in the tanks prior to entry.
- A. Copious quantity of fresh air
- B. Space to have a minimum oxygen level for sustaining lif
- C. Pressurized oxygen pumped
- D. Space to be ventilated for 24 hours
19. gas pressurizes the liquid out of the soda acid type- water extinguisher through the dip tube.
- A. hydrogen
- B. oxygen
- C. nitrogen
- D. carbon-dioxid
20. Good housekeeping on a vessel prevents fires by
- A. allowing better access in an emergency
- B. eliminating potential fuel sources
- C. eliminating trip hazards
- D. improving personnel qualifications
21. On each LNG cargo tank two relief valves are fitted. Identify the correct combination of "set pressure" (lifting pressure) and "reseating pressure" for these valves.
- A. 250 mbar and 220 mbar
- B. 50 mbar and 20 mbar
- C. 2.5 bar and 2.2 bar
- D. 500 mbar and 200 mbar
22. Advantages of reliquefaction plant on LNG tankships will not include,
- A. Total quantity of LNG loaded can be delivered to the customer
- B. Reduction in heel required on ballast voyag
- C. Lower S0 and NO emissions
- D. Proven technology and easy availability of crew
23. What happens to the air leaving drying tower if the activated alumina inside cylindrical alumina inside cylindrical tank is "old" (inefficient)?
- A. It will not be at required dew point
- B. It will not be affected at all
- C. It will not be warm enough
- D. It will not be cold enough
24. What is provided to ensure that the low duty gas compressor flow rate does not fall below the designed minimum?
- A. An automatic shut down system
- B. An automatic surge control system
- C. An automatic venting system
- D. An automatic start system
25. Onboard an LNG Tanker, while vaporizing during cargo discharge using the main vaporizer, what is the approximate desired outlet temperature of LNG vapour?
- A. -140°C
- B. -130°C
- C. -10°C
- D. -120°C
26. There are typically two types of gas heaters onboard an LNG tanker. One is the main heater and which of the following options is the other?
- A. IG heater
- B. Fuel gas heater (Boil - off gas heater)
- C. Nitrogen heater
- D. Air heater
27. A typical membrane method Nitrogen Generator's Air Compressor will trip when the following occur, EXCEPT
- A. Nitrogen storage tank pressuree high
- B. Air Compressor oil separator pressuree high
- C. Air Compressor oil separator inlet temperature high
- D. Air Compressor oxygen reading 20% by volum
28. The following are the communication connection integrated in the ESDS fibre optic system, EXCEPT:
- A. 1 connection satellite telephon
- B. 1 hotline telephone (to terminal)
- C. 1 public telephon
- D. 1 normal telephone (to terminal)
29. What is the purpose of having a level gauging system?
- A. To avoid over pressureizing of cargo tanks during loading operation
- B. To ensure tank cool down rate is maintained at required rat
- C. To get accurate tank levels for custody transfer and topping up
- D. To prevent sudden temperature change in the insulation spaces
30. What is the type of gas detection system fitted for spaces with air?
- A. Spot metering type fixed inside the individual insulation spaces
- B. Infrared type using sequential measurement
- C. Portable gas detection system due to mobility of this method
- D. Catalytic combustion typ
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