GASCO exit exam questions and answers — Set 3 — Advanced Training for Liquefied Gas Tanker Cargo Operations
Set 3 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 3 — 30 GASCO exit exam questions with answers
1. The mass of a Vapour compared with the mass of an equal volume of air both at standard condition to temp and pressure is
- A. Relative liquid density
- B. Relative vapour density
- C. Relative density
- D. None of the abov
2. Changing of cargo which may involve
- A. Only gas freeing
- B. Only inerting
- C. Only gassing up
- D. All of the abov
3. On which type of cargo tank would you find a bimetallic joint or STJ
- A. Kvaerner Moss Type B
- B. Gas transport membrane
- C. Type C
- D. Prismatic Type A
4. If the cargo density is different from that specified the float gauge manufacturer what will you adjust
- A. Float correction
- B. Trim correction
- C. List correction
- D. Tape correction
5. The frequency of pressure testing ashore of BA set should at least every
- A. 6 years
- B. 5 years
- C. 10 years
- D. 15 years
6. What is the guiding rule for limiting pressure surge on loading or discharging
- A. Stop the cargo pump
- B. First close ESD valve nearest to the pump
- C. Finally close other ESD valv
- D. All the abov
7. The ventilation of the airlock should be of the ______ pressure type
- A. Negativ
- B. Positiv
- C. Neutral
- D. None of the abov
8. Why is it necessary to cool down cargo tanks (refrigerated ships) during bulk loading
- A. To avoid overflow
- B. To avoid vapors emission
- C. To avoid vacuum in cargo tank
- D. To avoid excessive tank pressure
9. An overdose of toxic petroleum vapour effects your sense of smell by
- A. Reducing it temporarily
- B. Taking it away completely
- C. Improving it temporarily
- D. Improving it permanently
10. All liquefied gases produces vapours which have a relative vapour density greater than that of
- A. Methan
- B. Methane and ethylen
- C. Methane, ethylene and ammonia
- D. None of the abov
11. Gas codes and classification society rules require every tank to be fitted at least _____ level gauge
- A. On
- B. Two
- C. Thr
- D. Four
12. The concentration of a hydrocarbon gas is air below which there is insufficient hydrocarbon is called
- A. Lower flammable limit
- B. Dry air
- C. Upper flammable limit
- D. Stoichiometric ratio
13. After stopping the cargo compressor, the glycol/water system is left running to provide
- A. Crank case heating
- B. Remove cargo vapours
- C. Both a and b
- D. None of the abov
14. Fixed water spray system for fire protection purpose in gas tanker covers area such as
- A. Cargo tanks domes only
- B. The front of the accommodation and control room bulkhead
- C. Cargo tank area above deck and cargo manifold area
- D. All the abov
15. When carbon atoms joined by double covalent bonds C-C or triple covalent bonds, what is it called as
- A. Saturated organic compound
- B. Unsaturated organic compound
- C. Both a and b
- D. None of the abov
16. What is liquid relative density at atmospheric boiling point of methane
- A. 0.427
- B. 144
- C. 195.7
- D. None of the abov
17. The ability of a substance to cause damage to living tissue or impairment of the central nervous system
- A. Asphyxia
- B. Frost bit
- C. Toxicity
- D. None of the abov
18. How suction capacity and resulting discharge rate can be regulated
- A. By reducing pump speed
- B. By throttling the discharge valv
- C. By creating bypass (return flow)
- D. All the abov
19. What are the necessary condition that must take place for an electrical discharge to occur
- A. Electrostatic separation
- B. Electrostatic accumulation
- C. Electrostatic discharg
- D. All the abov
20. Gas ships cargo compressor room, cargo tank area are
- A. Snap back area
- B. Gas safe area
- C. Gas dangerous
- D. All the abov
21. What does Exe represents
- A. Flameproof
- B. Pressurized
- C. Increased safety
- D. None of the abov
22. 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
23. 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
24. 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
25. 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
26. 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
27. Up to what temperature is methane vapour heavier than air
- A. -110C
- B. -161 .5C
- C. -125C
- D. 15C
28. 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%
29. 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
30. 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
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