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GASCO exit exam questions and answers — Set 8

Set 8 of the Advanced Training for Liquefied Gas Tanker Cargo Operations (GASCO) exit exam bank — 30 of 351 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 8 — 30 GASCO exit exam questions with answers

1. Identify the odd one. Which of the following is not an important point to be monitored when using a gas heater?

  • A. Hot or cold phase flow should be established in the correct sequenc
  • B. Equipment shall always to be operated in manual mod
  • C. Heaters shall be pressuree tested prior usage or otherwise checked for leaks at regular
  • D. Instrumentation and associated equipment should be functioning correctly.
Answer: B — Equipment shall always to be operated in manual mod
The correct answer is Equipment shall always to be operated in manual mod. This complies with established gas tanker operational standards, thermodynamics, and the IGC Code safety requirements.

2. Which of the following types LNG carrier propulsion systems will typically have a re-liquefaction plant onboard?

  • A. Steam turbin
  • B. Ultra steam turbines
  • C. Duel - fuel diesel electric (DFDE)
  • D. Low - speed diesel
Answer: D — Low - speed diesel
The correct answer is Low - speed diesel. This complies with established gas tanker operational standards, thermodynamics, and the IGC Code safety requirements.

3. Onboard a membrane class LNG carrier, when is an auxiliary or emergency cargo pump put into use?

  • A. Total cargo pumps failur
  • B. One cargo pump failur
  • C. Two cargo pumps failur
  • D. Stripping pumps failur
Answer: A — Total cargo pumps failur
In Gaztransport & Technigaz NO 96 membrane containment systems, Invar membranes and perlite insulation boxes maintain cargo containment and thermal insulation.

4. Which of the following could be a possible cause when the refrigeration compressor "noise" is high?

  • A. Lubrication oil pressuree high
  • B. Lubrication oil pressuree low
  • C. No lubrication oil
  • D. Compressor suction pressuree low
Answer: B — Lubrication oil pressuree low
The correct answer is Lubrication oil pressuree low. This complies with established gas tanker operational standards, thermodynamics, and the IGC Code safety requirements.

5. When ESDS is activated either automatically or manually the following equipment is shutdown on the ship, EXCEPT:-

  • A. HD compressors
  • B. Deck air conditioning unit
  • C. All main and auxiliary cargo pumps
  • D. All manifold valves. allowed valv
Answer: B — Deck air conditioning unit
ESDS automatic fusible thermal elements are designed to melt between 98°C and 104°C during a fire, depressurizing the pneumatic loop and tripping the emergency shutdown system.

6. What is the limitation of a combustible gas detector of catalytic combustion type?

  • A. It cannot be used for measurement in air
  • B. It cannot be used for measurement in nitrogen
  • C. It cannot be used for measurement in methan
  • D. It cannot be used for measurement in oxygen
Answer: B — It cannot be used for measurement in nitrogen
The correct answer is It cannot be used for measurement in nitrogen. This complies with established gas tanker operational standards, thermodynamics, and the IGC Code safety requirements.

7. Following are means of links available onboard to connect ship's ESDS to shore ESDS, EXCEPT:-

  • A. Pneumatic link
  • B. Fibre - optical system
  • C. Bluetooth link
  • D. Electrical link
Answer: C — Bluetooth link
ESDS automatic fusible thermal elements are designed to melt between 98°C and 104°C during a fire, depressurizing the pneumatic loop and tripping the emergency shutdown system.

8. During a fully loaded passage, cold spots are beyond control. It is confirmed that it is unsafe to delay discharge of cargo from the damaged cargo tank. What is the action to be taken?

  • A. To jettison the cargo via the emergency discharge connection
  • B. To discharge all the cargo to nearby ballast tank
  • C. To transfer cargo of the affected tank to other fully loaded tanks
  • D. To vent out all the cargo via vapor header mast riser
Answer: A — To jettison the cargo via the emergency discharge connection
The correct answer is To jettison the cargo via the emergency discharge connection. This complies with established gas tanker operational standards, thermodynamics, and the IGC Code safety requirements.

9. A major failure of the primary membrane will allow LNG to flood the primary insulation space. In addition there will be a tendency for the liquid level in the main cargo tank and a space to equalize. Which of the following is this space?

  • A. The primary insulation space to equaliz
  • B. The secondary insulation space to equaliz
  • C. The both insulation space to equaliz
  • D. The vapor dome space to equaliz
Answer: A — The primary insulation space to equaliz
In Gaztransport & Technigaz NO 96 membrane containment systems, Invar membranes and perlite insulation boxes maintain cargo containment and thermal insulation.

10. Zone definitions does not include,

  • A. Zone 0: Area in which an explosive gas atmosphere is present continuously or is present for a long period.
  • B. Zone 1: Area in which an explosive gas atmosphere is likely to occur in normal operation.
  • C. Zone 2: Area in which an explosive gas atmosphere is not likely to occur in normal operation, and if it does occur is likely to do so only infrequently and will exit for a short period only.
  • D. Zone 3: Area in which explosion can occur on a LNGF vessel
Answer: D — Zone 3: Area in which explosion can occur on a LNGF vessel
The correct answer is Zone 3: Area in which explosion can occur on a LNGF vessel. This complies with established gas tanker operational standards, thermodynamics, and the IGC Code safety requirements.

11. How is moisture removed from the insulation spaces before a damaged insulation spaces is being repaired?

  • A. By injecting wet steam into secondary insulation spaces
  • B. By installing water heater inside the ballast tank
  • C. By installing bags of activated alumina inside the insulation spaces
  • D. By drying out the insulation spaces with nitrogen gas
Answer: D — By drying out the insulation spaces with nitrogen gas
The correct answer is By drying out the insulation spaces with nitrogen gas. This complies with established gas tanker operational standards, thermodynamics, and the IGC Code safety requirements.

12. Based on the principles of segregation, what would you classify cargo containment system as?

  • A. Gas dangerous spac
  • B. Gas dangerous zon
  • C. Gas safe zon
  • D. Gas safe spac
Answer: A — Gas dangerous spac
The correct answer is Gas dangerous spac. This complies with established gas tanker operational standards, thermodynamics, and the IGC Code safety requirements.

13. Based on the principles of segregation, what would you classify the deck of an LNG carrier?

  • A. Gas dangerous spac
  • B. Gas dangerous zon
  • C. Gas safe zon
  • D. Gas safe spac
Answer: D — Gas safe spac
The correct answer is Gas safe spac. This complies with established gas tanker operational standards, thermodynamics, and the IGC Code safety requirements.

14. What is the ideal location for a cargo tank from the shell plating, in any Gas tanker type?

  • A. less than 760 mm (30 inches) from the shell plating
  • B. less than 750 mm (29.5 Inches) from the ship sid
  • C. less than 740 mm (29 inches) from the main deck
  • D. less than 730 mm (28.7 inches) from the summer draft
Answer: B — less than 750 mm (29.5 Inches) from the ship sid
The correct answer is less than 750 mm (29.5 Inches) from the ship sid. This complies with established gas tanker operational standards, thermodynamics, and the IGC Code safety requirements.

15. Which chapter of the IGC Code refers to the summary of minimum equipment requirements for an LNG carrier?

  • A. Chapter 18
  • B. Chapter19
  • C. Chapter 17
  • D. Chapter 16
Answer: B — Chapter19
The correct answer is Chapter19. This complies with established gas tanker operational standards, thermodynamics, and the IGC Code safety requirements.

16. Which statements is true in accordance with Chapter 15 of the IGC Code?

  • A. 95% of the total volume of the tank at reference temperatur
  • B. 96% of the total volume of the tank at reference temperatur
  • C. 97% of the total volume of the tank at reference temperatur
  • D. Cargo tanks onboard should not be filled higher 98% of the total volum
Answer: D — Cargo tanks onboard should not be filled higher 98% of the total volum
The correct answer is Cargo tanks onboard should not be filled higher 98% of the total volum. This complies with established gas tanker operational standards, thermodynamics, and the IGC Code safety requirements.

17. Exposure controls/personal protection in MSDS will not include,

  • A. OSHA permissible exposure limit (PEL), Threshold Limit Value (TLV), and any other exposure limit used or recommended
  • B. Appropriate handling controls
  • C. Appropriate engineering controls
  • D. Individual protection measures, such as personal protective equipment.
Answer: B — Appropriate handling controls
The correct answer is Appropriate handling controls. This complies with established gas tanker operational standards, thermodynamics, and the IGC Code safety requirements.

18. Which of these is not a possibility if by accident the insulation spaces are over pressurized?

  • A. Membrane collaps
  • B. Lifting of insulation safety valves
  • C. Initiation of emergency shut down
  • D. Tripping of cargo pump
Answer: D — Tripping of cargo pump
The correct answer is Tripping of cargo pump. This complies with established gas tanker operational standards, thermodynamics, and the IGC Code safety requirements.

19. Fire-fighting measures shown in MSDS will not include,

  • A. Suitable (and unsuitable) extinguishing media
  • B. Specific hazards arising from the chemical (e.g., nature of any hazardous combustion products)
  • C. Training requirement for firefighting and Special protective equipment
  • D. Special protective equipment and precautions for fire-fighters
Answer: C — Training requirement for firefighting and Special protective equipment
The correct answer is Training requirement for firefighting and Special protective equipment. This complies with established gas tanker operational standards, thermodynamics, and the IGC Code safety requirements.

20. What should be the typical content of oxygen in inert gas produced by an inert gas generator onboard an LNG carrier?

  • A. 0.5%
  • B. 12.6%
  • C. 7.5%
  • D. 13%
Answer: A — 0.5%
The correct answer is 0.5%. This complies with established gas tanker operational standards, thermodynamics, and the IGC Code safety requirements.

21. If an LNG sale document is marked as Free on Board (FOB), after discharge who is the owner of the "heel' retained onboard?

  • A. Seller owns the heel and may keep it onboard as he controls the vessel
  • B. Seller owns the heel and may heel out
  • C. Buyer owns the heel and may keep it onboard as he controls vessel 6
  • D. Seller owns the heel and may keep It to mix with the next cargo
Answer: C — Buyer owns the heel and may keep it onboard as he controls vessel 6
Retaining a small heel of LNG cargo on ballast voyages maintains tank cryogenic temperatures, minimizes thermal shock, and avoids lengthy pre-cooling at the loading port.

22. What is the temperature at which gas saturates and the water vapor present begins to condense?

  • A. Boiling point
  • B. Condensate point
  • C. Vapor point
  • D. Dew point
Answer: D — Dew point
The correct answer is Dew point. This complies with established gas tanker operational standards, thermodynamics, and the IGC Code safety requirements.

23. Identify the correct name for a gas or mixture of gases, containing insufficient oxygen to initiate and support combustion where oxygen content is not greater than 5% by volume.

  • A. Inert gas
  • B. Cold gas
  • C. Anti - fire gas
  • D. Anti - oxygen gas
Answer: A — Inert gas
The correct answer is Inert gas. This complies with established gas tanker operational standards, thermodynamics, and the IGC Code safety requirements.

24. What is the designed boil-off rate for a typical membrane type LNG carrier?

  • A. 0.15% of full cargo tank capacity / day
  • B. 0.05% of full cargo tank capacity / day
  • C. 0.25% of full cargo tank capacity / day
  • D. 0.5% of full cargo tank capacity / day
Answer: A — 0.15% of full cargo tank capacity / day
In Gaztransport & Technigaz NO 96 membrane containment systems, Invar membranes and perlite insulation boxes maintain cargo containment and thermal insulation.

25. What is done with Normal Boil - off (NBO) vapour?

  • A. It is removed to maintain the cargo temperature and pressure
  • B. It is retained in the tanks as it has no effect
  • C. It is vented to atmospher
  • D. It is collected and stored in the buffer tank
Answer: A — It is removed to maintain the cargo temperature and pressure
The correct answer is It is removed to maintain the cargo temperature and pressure. This complies with established gas tanker operational standards, thermodynamics, and the IGC Code safety requirements.

26. Which of these factors is not considered when calculating the heel to be retained onboard?

  • A. Duration of ballast passage
  • B. Saturated vapor pressuree of the cargo
  • C. Weather forecast for the loaded passage
  • D. Level restriction due to sloshing effect
Answer: B — Saturated vapor pressuree of the cargo
Retaining a small heel of LNG cargo on ballast voyages maintains tank cryogenic temperatures, minimizes thermal shock, and avoids lengthy pre-cooling at the loading port.

27. Onboard a LNG tanker, with NO 96 containment system, what happens to the cargo when a cargo tank suffers a major primary barrier failure?

  • A. The cargo will flood the primary insulation spac
  • B. The cargo will flow out to shipsid
  • C. All the cargo will boil - off immediately
  • D. The cargo will freeze up
Answer: A — The cargo will flood the primary insulation spac
In Gaztransport & Technigaz NO 96 membrane containment systems, Invar membranes and perlite insulation boxes maintain cargo containment and thermal insulation.

28. During a cargo handling operation which of the following precautions need not be observed to deal with spillage?

  • A. Deck spray pump (IMO) system on standby mod
  • B. Protective clothing used
  • C. Constant patrol of cargo area maintained
  • D. Shore spill team on standby mod
Answer: D — Shore spill team on standby mod
The correct answer is Shore spill team on standby mod. This complies with established gas tanker operational standards, thermodynamics, and the IGC Code safety requirements.

29. What is the main danger when discharging a damaged cargo tank in a normal manner?

  • A. Discharging pump will trip due to debris in the tank
  • B. Discharging time will be shorter due to lesser cargo in the tank
  • C. Collapse of secondary membranee due to high differential head
  • D. Collapse of the primary membranee due to high differential head
Answer: D — Collapse of the primary membranee due to high differential head
The correct answer is Collapse of the primary membranee due to high differential head. This complies with established gas tanker operational standards, thermodynamics, and the IGC Code safety requirements.

30. What is the definition for the term "minor failure of membrane?

  • A. Activation of gas detection equipment for insulation despite of purging with nitrogen
  • B. Fatigue cracks develop with obvious signs of pressuree rise and the presence of methane vapor
  • C. Porosity of membranee which allows limited liquid into insulation spaces
  • D. Minor fatigue cracks, passing liquid into the insulation space and becomes gaseous
Answer: D — Minor fatigue cracks, passing liquid into the insulation space and becomes gaseous
In Gaztransport & Technigaz NO 96 membrane containment systems, Invar membranes and perlite insulation boxes maintain cargo containment and thermal insulation.

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