GASCO exit exam questions and answers — Set 9 — Advanced Training for Liquefied Gas Tanker Cargo Operations
Set 9 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 9 — 30 GASCO exit exam questions with answers
1. Onboard an LNG tanker, the main cargo pumps are installed at the bottom of the tripod mast located in the after end of cargo tanks, Which factor should be adjusted to maximize discharge rate?
- A. Vapor supply capacity
- B. Trim
- C. List
- D. Gas burning capacity
2. In ship's ESDS, an automatic electrical system which energizes ESDS due to temperature change of the sensor, fitted at each tank domes and both manifold platforms is known as
- A. Automatic fusible elements
- B. Automatic push button
- C. Infrared gas detection system
- D. Automatic heat sensors
3. Which of the following will not cause an activation of the ESDS?
- A. Differential pressuree between cargo tank and atmosphere - too low
- B. Differential pressuree between cargo tank and primary insulation space - too low
- C. Differential pressuree between primary and secondary insulation space - too low
- D. Manual push button and fusible elements
4. Where can electrical equipment classified as exib be used?
- A. In Zones 0, 1 and 2
- B. In Zones 1 and 2
- C. In Zones 0 and 2
- D. In Zones 0 and 1
5. What is the latest propulsion solution introduced to the LNG shipping industry?
- A. Steam turbines
- B. Duel - Fuel Diesel Electric (DFDE)
- C. Low - speed diesel with a BOG reliquefaction plant
- D. Gas turbin
6. Onboard an LNG carrier, with NO 96 containment system, what will happen when pressure inside primary space is equal to cargo tank pressure?
- A. Primary barrier strips will be shifted from its original position
- B. Primary barrier strips will be pressed hard onto primary insulation box
- C. Primary barrier will collapse inward
- D. Nothing will happen - no damagee to primary barrier
7. Which are the international bodies that provide regulatory standards for electrical equipment certification?
- A. IEEC and CENELEC
- B. IEC and CENELEC
- C. IEEC and ISO
- D. IMO and ISO
8. After the removal of bulk water from damaged insulation space, Why is it so important to dry out the spaces until the atmosphere dew point is -40°C or lower
- A. As there is a possibility for water being trapped and remaining in the insulation spaces
- B. As there is a posisbility of mud collected at the bottom of the insulation spaces
- C. To cool down the cargo tanks for immediate loading of cargo
- D. To avoid the accumulation of rust dust at the bottom of the insulation spac
9. The commercially viable propulsion systems for Deepsea LNG tanker ships will not include,
- A. Conventional plant with steam turbines and dual fired boilers
- B. Bual-Fuel Diesel Electric (DFDE) plant
- C. Slow Speed Diesel with a Boil-Off Gas (BOG) Reliquefaction Plant
- D. Medium speed Diesel with a BOG Reliquefaction plant
10. What should the Master of an LNG carrier do if the CTS fails?
- A. Use the gauging reports of shore receiving tanks.
- B. Inform the Company and receivers. Use manual gauging and tank tables
- C. Inform the terminal and activate ESD button
- D. Suspend cargo operation till CTS is repaired
11. As per IGC Code the "design loads" for a particular cargo containment system, which calculation is a requirement?
- A. Crack load
- B. Sloshing load
- C. Hydrostatic load
- D. Damage load
12. The carriage of LNG cargo requires a certificate for trading called as___________.
- A. International Certificate of Fitness for the Carriage of Liquefied Gases in Bulk
- B. International Pollution Prevention Certificate for the Carriage of Noxious Liquid Substances in Bulk (NLS Certificate)
- C. The International Code of the Construction and Equipment of Ships Carrying Liquefied Gases in Bulk (IGC Code), has been mandatory under OLAS chapter VII
- D. International Certificate of Fitness for the Carriage of Dangerous Chemicals in Bulk
13. If an LNG sale document is marked as Delivered Ex Ship (DES), after discharge who is the owner of the 'heel' retained onboard?
- A. Heel belongs to the buyer
- B. Heel belong to the seller
- C. Heel belongs 50% to the buyer and 50% to the seller
- D. Heel belongs 75% to the buyer and 25% to the seller
14. At what temperature will methane change from vapour to liquid at atmospheric pressure?
- A. -141.5°C
- B. -161.5°C
- C. -151.5°C
- D. -131.5°C
15. What is the critical temperature and pressure of methane?
- A. -145.5°C and 44.7 bars
- B. -82.5°C and 47,4 bars
- C. -82.5°C and44.7 bars
- D. -161.5°C and 47.4 bars
16. Typical inert gas consists of approximately 0.5% Oxygen, 15% Carbon dioxide, 0.5% Carbon monoxide, Oxides of nitrogen and Sulphur dioxide. Which gas forms nearly 84% of the Inert gas?
- A. Propan
- B. Nitrogen
- C. Butan
- D. Methan
17. What are the two main contractual arrangements used in LNG shipping?
- A. Delivery Ex - Ship (DES) and Freight On Board (FOB)
- B. Delivery Ex - Ship (DES) and Free On Board (FOB)
- C. Delivery Ex Shore (DES) and Free On Board (FOB)
- D. Delivery On Board (DOB) and Free On Board (FOB)
18. Natural and shale gas deposits are not supported by_____________.
- A. Conventional and non-associated gas deposits which are called natural gas deposits
- B. Natural gas deposits which are much closer to the surface just under the seal
- C. Shale gas deposits which are deposits of natural gas found in shale formations.
- D. Shale gas deposits which are much less deep than the conventional deposits
19. What is the agreement between the buyer and the end-users called as?
- A. Sale and Purchase Agreement(SPA)
- B. Delivery Ex-Ship (DES)
- C. Gas sale agreement(GSA)
- D. Free On Board(FOB)
20. Identify the odd one out. Which of these factors will not increase the boil-off onboard an lng carrier?
- A. Detoriation of insulation barriers
- B. sloshing in the cargo tanks
- C. Rasing of insulation space pressure
- D. Long loaded passage
21. the methods used for producing inert gas onboard LNG carriers are many, which one method may no longer be used?
- A. By stoichiometric combustion in an inert gas combustion
- B. flue gas from main boilers
- C. Nitrogen by fractional distillation or by pressuree swing absorbtion(PSA)
- D. Nitrogen by turning liquid nitrogen from shore to nitrogen gas
22. Which law states that the sum of the partial pressures of the constituent gases of a mixture of gases is equal to the total pressure of the gas mixture?
- A. Boyle's law
- B. Gay Lussac's law
- C. Charles's law
- D. Dalton's law of partial pressure
23. What is the quantity of heat absorbed on vaporization at normal boiling point?
- A. Vaporization heat
- B. Latent heat
- C. Condensation heat
- D. lost heat
24. During normal loading/ discharging cycle, how does keeping the tanks cool and ready for loading help?
- A. It reduces the thermal stresses on the membrane
- B. It increases the ship operation costs
- C. It increases thermal stresses on the membrane
- D. It reduces boil-off in the ballast passage
25. Find the correct answer. A vessel certified to carry an NLS(Noxious liquid substances) must comply with
- A. OSHA regulations
- B. International Pollution Prevention Certificate for the carriage of Noxious liquid substances
- C. STCW regulations
- D. ILO regulations
26. Based on the principles of segregation, what would you classify the cargo compressor room?
- A. Gas safe spac
- B. Gas safe zon
- C. Gas dangerous zon
- D. Gas dangerous spac
27. Which of the following are not the early signs of structural failure of the inner hull?
- A. Increasing of Lng level in cargo tanks, by incoming seawater
- B. Water detected in secondary insulation spac
- C. Further lowering of insulation space temperature sensed by the thermocoupl
- D. Maximum methane reading detected by the explosive meter inside insulation spaces
28. Insulation materials for use on liquefied gas carriers shall possess the following, except:
- A. ability to bear physical loads
- B. Ingress of moisture is not possible thereb, loss of insulation performanc
- C. ability to withstands mechanical damage
- D. reasonably lightweight
29. How is the formation of cold spots on the inner hull surfaces which is not fitted with thermocouples detected?
- A. By using remote ice detection device at any tim
- B. frequent inspections of inner hull on ballast passage
- C. By using remote lng leak detector any tim
- D. frequent inspections of inner hull on loaded passage
30. What will happen if the primary space is at least partially flooded with LNG?
- A. No reduction in exhaust flow to atmosphere or increase in the temperature of the secondary spaces
- B. Changes in exhaust flow to atmosphere and increase in the temperature of secondary spaces
- C. Reduction in exhaust to atmosphere or decrease in the temperature of secondary spaces
- D. Pressure insulation will increase and temperature for primary spaces will reduces
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