GASCO exit exam questions and answers — Set 4 — Advanced Training for Liquefied Gas Tanker Cargo Operations
Set 4 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 4 — 30 GASCO exit exam questions with answers
1. Why LNG is liquefied for sea transportation
- A. LNG has high calorific value than natural gas
- B. Natural gas transportation by sea is banned
- C. It makes it more economical to transport
- D. The ship can choose the form of neutral gas or LNG to be loaded
2. Which of the following is the typical seal gas system used for low duty gas compressor ?
- A. R 404
- B. Carbon dioxid
- C. Nitrogen
- D. Argon
3. The purpose of remotely controlled measuring of tank levels are to measure
- A. Height from liquid surface to top stringers in the tank
- B. Height of the liquid in the tank
- C. Height from bottom shell to top stringers in the tank
- D. Height of bottom girders in the tank
4. One of the following is NOT an alarm on an inert gas plant, which one?
- A. Low pressuree alarm
- B. Low oxygen Alarm
- C. Deck sea Low water Alarm
- D. Scrubber high water level alarm
5. On all gas ships, any pipework entering or leaving the cargo tank must do so through the ____ of the tank
- A. Aft end
- B. Top
- C. Bottom
- D. Forward end
6. If a centrifugal pump operating with a positive suction head becomes air bound, your FIRST response should be to _____
- A. Vent the casting
- B. Tighten the packing
- C. Close the discharg
- D. Re-prime the pump
7. How much cleaner is natural gas to burn?
- A. Reducing Carbon Dioxide (CO2) emissions by 20% to 30%
- B. Reducing carbon monoxide (CO) emissions up to 75%
- C. Reducing nitrous oxide (NO2) emission by appropriately 50%
- D. All the abov
8. Self contained breathing apparatus – SCBA is also called as
- A. Compressed air breathing apparatus – CABA
- B. EEBD
- C. ELSA
- D. None of the abov
9. The space enclosed by the ships structure in which a cargo Containment system is situated called ______
- A. Hold spac
- B. Compressor room
- C. Motor room
- D. Engine room
10. This liquefied gas is normally carried in its fully refrigerated condition at its atmospheric boiling point of -104 °C is ______
- A. Ethylen
- B. Propan
- C. Butan
- D. Ammonia
11. How is cooling/Cleaning water supplied to the inert gas scrubber tower?
- A. By the main sea water pumps
- B. By the cargo condenser pump
- C. By the scrubber sea water pump
- D. By the deck seal sea water pump
12. Which safety device is fitted on the deck inert gas line to monitor the supply condition of the inert gas?
- A. The inert gas high temperature alarm
- B. The inert gas low flow alarm
- C. The inert gas low pressuree alarm
- D. The inert gas reverse flow alarm
13. What characteristics should insulation materials possess for use in gas carriers?
- A. Low thermal conductivity, ability to bear loads
- B. Ability to with stand mechanical damagee, lightweight
- C. Unaffected by cargo liquid or vapour
- D. All the abov
14. Which of the following is the ultimate source of energy for us?
- A. LNG
- B. Nuclear
- C. Solar
- D. CNG
15. Why strainers are commonly installed in the cargo piping system?
- A. To protect the cargo handling plant
- B. To protect equipment from damagee by foreign objects
- C. Both A and B
- D. None of the abov
16. Which of these would you consider essential equipment to carry when working on the deck of ship carrying ammonia?
- A. Gloves
- B. Personal O meter
- C. Gas mask
- D. Personal Hydrocarbon alarm
17. What is the condition of inert gas as it is produced by the boilers or inert gas generator?
- A. Free of oxygen and clean
- B. Hot and containing soot particles
- C. Dirty and saturated
- D. Super heated and black or greyish in colour
18. For what reason cargo sampling is necessary in gas tanker?
- A. To establish safe conditions prior to cargo transfer
- B. To establish that the cargo is within commercially agreed specifications at various Pumps
- C. Both A and B
- D. None of the abov
19. What is the MAIN danger to be guarded against when discharging using a cargo heater with sea water as the heating medium?
- A. Over pressureizing of the gas side of the water
- B. Freezing of the water side of the heater
- C. Over pressureizing of the water side of the heater
- D. Overheating of the gas side of the heater
20. Magnesium, Titanium, Sodium, Lithium and Potassium are classified as
- A. Class A fir
- B. Class B fir
- C. Class C fir
- D. Class D fir
21. What are the symptoms of Asphyxiant , when LPG and LNG carried as cargo?
- A. Increased rate and dept of respiration and loss of consciousness
- B. Blueness of the skin (Cyanosis)
- C. Stertorous breathing with a snoring sound
- D. All of the abov
22. Inert gas- How is sea water supplied to the deck seal ?
- A. Through the main sea water pumps or through the condenser cargo pump
- B. Through a sea water aggregate pump fitted on the cargo deck
- C. Through the deck fire lin
- D. Through the deck seal pump fitted in the engine room
23. On tank vessels, which of these valve types is most commonly used in conjunction with hydraulically actuated controls?
- A. Non return valves
- B. Globe valves
- C. Butterfly valves
- D. Gate valves
24. What is critical temperature of methane in °Celsius ?
- A. -82.5
- B. 82.5
- C. 52.8
- D. None of the abov
25. On tank vessels equipped with the power operated cargo tank valves, the type of power operator most commonly used is _____
- A. Hydraulic
- B. Electric
- C. Steam
- D. Diesel
26. The valve best suited for throttling gas or liquid flow in a pipe line is the _____
- A. Globe valv
- B. Gate valv
- C. Check valv
- D. Pug cock
27. What is the boiling point at atmospheric pressure of ammonia
- A. -42 °Celsius
- B. -34 °Celsius
- C. -5 °Celsius
- D. None of the abov
28. Which tanks are completely supported self-supporting and do not form part of the ship's hull structure
- A. Independent tanks
- B. Membrane tank
- C. Semi membranee tank
- D. None of the abov
29. Ammonia forms explosive compounds with
- A. Mercury alon
- B. Mercury, chlorine, iodine, bromine, calcium, silver oxide and silver hypo chlorit
- C. Silica
- D. Water
30. A bigger spell of LPG will be visible as a _____ which is condensed water vapour from the atmosphere
- A. White cloud
- B. Blue cloud
- C. Black cloud
- D. None of the abov
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