GASCO exit exam questions and answers — Set 7 — Advanced Training for Liquefied Gas Tanker Cargo Operations
Set 7 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 7 — 30 GASCO exit exam questions with answers
1. What can lead to LNG (cargo) leak into primary insulation spaces?
- A. Fatigue crack on ship hull
- B. Fatigue cracks on primary membrane
- C. Fatigue cracks on secondary membrane
- D. Fatigue crack on ballast tank stiffener
2. The LNG cargo tank insulation system is designed to perform the following, EXCEPT:-
- A. Maintain the boil - off losses from the cargo at an acceptable level
- B. Protect cargo valves and piping
- C. Protect the inner hull steel from the effect of excessively low temperatur
- D. Reduce heat transfer from the outside into cargo tank
3. Where is the secondary insulation pump well typically located?
- A. Aft of each tank secondary insulation spac
- B. Forward of each tank secondary insulation spac
- C. Centre of each tank secondary insulation spac
- D. Top of each tank secondary insulation spac
4. Which of the following may not contribute to structural failure of inner hull?
- A. Destruction of inner hull due to ship grounding
- B. Destruction of ship side due to collision
- C. Destruction of Ballast pump during high speed operation
- D. Destruction of the insulation space due to sloshing effect
5. During a cargo handling operation which of the following precautions need not be observed to deal with spillage?
- A. Fire fighting equipment on standby mod
- B. Manifold shipside water spray curtain used
- C. Ship cordoned off with LNG containment boom
- D. Deck fire main on standby mod
6. On an LNG tanker, why ballasting operation is carried out concurrently with LNG discharging operation?
- A. To ensure stability criteria is met at all times
- B. To ensure vessel has sufficient trim for discharging
- C. To ensure easy shore gangway adjustment
- D. To maintain manifold alignment with shore marker
7. What will happen if cold LNG Boil - Off Gas (BOG) vented through the mast riser?
- A. Mast riser will frozen up and it is possible to crack
- B. Methane vapor will caught fire immediately
- C. Methane vapor will be tuming back to LNG liquid
- D. Big white plume will be produced
8. Traces of inert gas constituents may be present even after aerating. What are the limits for carbon dioxide (CO2) and carbon monoxide?
- A. CO2 <1.5% BV and CO <150ppm
- B. CO2 <1.5% BV and CO <250ppm
- C. CO2 <1.0%BV and CO <50ppm
- D. CO2 <0.5% BV and CO <50ppm
9. What should be done before commencing unloading test?
- A. Ship should provide specifications to port
- B. Exchange of ship - shore safety plan
- C. Terminal should provide specifications to port
- D. Ship and terminal should test the ship's pumps
10. During a long ballast passage which method of retaining heel onboard produces less boil-off?
- A. Heel is retained in a center tank and sprayed in others
- B. Heel is retained in alternate tanks
- C. Heel is retained in 50% of the tanks
- D. Adequate heel is retained in all the tanks
11. How do you maintain the cargo tank pressure as low as possible (about 20 - 30 mbar gauge) during inerting operation after gas burning is stopped?
- A. by continuous venting via vapor dome's safety valves (manually opened)
- B. by continuous venting via vacuum pump mast riser
- C. by continuous venting via ship's funnel exhaust
- D. by continuous venting via dedicated mast riser
12. What should be the vessel's trim and list during gauging for custody transfer?
- A. Upright and 1 m down by stern
- B. Upright and 0.5 m down by stern
- C. There are no restrictions trim and list
- D. Upright and even keel
13. Fire fighters can control small LNG fire by using____________.
- A. water
- B. water mixed with ail
- C. high expansion foam
- D. dry chemical powder
14. Smoke detectors are classified into the following:
- A. Photoelectric typ
- B. Tonization typ
- C. Photoelectric type and Ionization typ
- D. Ionization type smoke detectors are in machinery spaces
15. Where do the cargo manifold relief lines, the cargo machinery space relief lines and cargo tanks relief lines lead to?
- A. They are led to a common riser
- B. They are led to gas line to engine room
- C. They are led to vapor domes
- D. They are led to high duty compressor suction lin
16. Onboard an LNG tanker, for both main and forcing steam vaporizers it is important to note the output capacity (the amount of LNG liquid turned into LNG vapor). What does this capacity depend on?
- A. Cooling water supplied to the vaporizers
- B. Heat supplied to the vaporizers (steam supply)
- C. Air supplied to the vaporizers
- D. Condensate returned from the vaporizers
17. Relief valves are used on an LNG carrier liquid header. Identify the correct combination of "set pressure" (lifting pressure) and "reseating pressure" for these valves.
- A. 100 mbar and 900 mbar
- B. 10 bar and 9 bar
- C. 15 bar and 10 bar
- D. 1000 mbar and 500 mbar
18. When does the need to rig the auxiliary cargo pump arise?
- A. When all the cargo pumps (main and stripping pumps) in a particular tank are out of servic
- B. When the needs arise to increase flow rate during discharging operation
- C. In case of one cargo pump of the particular tanks is out of servic
- D. To increase the loading rate of LNG from shore due to shore pumps is out of servic
19. 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.
20. 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
21. 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
22. 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
23. 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
24. 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
25. 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
26. 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
27. 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
28. 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
29. 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
30. 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
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