GASCO exit exam questions and answers — Set 4
Set 4 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 4 — 30 GASCO exit exam questions with answers
1. What does Exe represents
- A. Flameproof
- B. Pressurized
- C. Increased safety
- D. None of the abov
2. Onboard LNG tanker which of these requirements is not required for gas burning
- A. Vacuum pump
- B. Gas heater
- C. LD compressor
- D. Steam dump on main condenser
3. What is provided in a low duty gas compressor to prevent lubricating oil mist from entering the compressed LNG vapour ?
- A. The gas detection system
- B. The gas burning system
- C. c. The lubricating system
- D. The seal gas system
4. What is the first task to be completed before doing hot work permit.
- A. To inform chief engineer
- B. Work can be started without carrying out any other task
- C. To complete a hot work permit
- D. None of the abov
5. The most like place for the spontaneous combustion that take place is
- A. The oily rag bin
- B. The fuel oil tanks
- C. The electrical switch boards
- D. The pressuree tanks
6. Which of the following is not part of an arrangement in fiber optical system to accommodate 'fail safe' ESDS system
- A. The photo coupler of the input side are duplicated
- B. Frequency checking sides of O/P are duplicated
- C. The optical cables are protected by double layer of insulations
- D. The output circuits has double output contacts
7. Up to what temperature is methane vapour heavier than air
- A. -110C
- B. -161 .5C
- C. -125C
- D. 15C
8. What is the typical content of carbon dioxide in inert gas produced by an inert gas generator
- A. 25%
- B. 15%
- C. 20%
- D. 30%
9. A water repellant such as _____ is added in order to avoid humidity in the power
- A. Sulphur
- B. Silicon
- C. Calcium
- D. None of the abov
10. What does the term boil off mean
- A. Cargo vapour space in insulation spac
- B. Natural vapourization of LNG in the cargo tank
- C. Cargo tank vapour pressuree during voyag
- D. Excess steam dumped from the boiler
11. 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
12. 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
13. 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
14. 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
15. 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
16. 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
17. 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
18. Self contained breathing apparatus – SCBA is also called as
- A. Compressed air breathing apparatus – CABA
- B. EEBD
- C. ELSA
- D. None of the abov
19. 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
20. 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
21. 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
22. 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
23. 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
24. Which of the following is the ultimate source of energy for us?
- A. LNG
- B. Nuclear
- C. Solar
- D. CNG
25. 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
26. 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
27. 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
28. 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
29. 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
30. 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
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