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AIGF exit exam questions and answers — Set 11

Set 11 of the Advanced Training for Ships subject to the IGF Code (AIGF) exit exam bank — 30 of 342 questions, with the correct option marked, and 29 of them also carry a one-line explanation. 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 11 — 30 AIGF exit exam questions with answers

1. Reliquefaction of vapours method chosen shall be capable of maintaining tank pressure ___________ of the tank for a period of 15 days assuming full tank at normal service pressure

  • A. above the set volume
  • B. above the set pressure
  • C. below the set volume
  • D. below the set pressure
Answer: D — below the set pressure

2. How is reliquefaction system be designed and calculated?

  • A. direct system where evaporated fuel is compressed, condensed and returned to cargo tanks
  • B. direct system where evaporated fuel is compressed, condensed and returned to fuel tanks
  • C. an indirect system where evaporated fuel is compressed, condensed and returned to cargo tanks
  • D. an indirect system where evaporated fuel is compressed, condensed and returned to fuel tanks
Answer: B — direct system where evaporated fuel is compressed, condensed and returned to fuel tanks
Membrane fuel containment systems rely on load-bearing insulation to transfer dynamic liquid loads directly to the inner hull.

3. Which method is used in case of a single failure of the fuel tank pressure and temperature can be maintained by another service/system ?

  • A. Refrigerants system and its supporting auxiliary services
  • B. Primary system and its supporting auxiliary services
  • C. The non-availability of the system and its supporting auxiliary services
  • D. The availability of the system and its supporting auxiliary services
Answer: D — The availability of the system and its supporting auxiliary services
Secondary barriers must hold liquid fuel for a specified period without allowing the hull steel temperature to drop to brittle levels.

4. ___________ are for maintaining the pressure and temperature of the gas fuel tanks within their design ranges

  • A. Heat exchangers
  • B. Primary system
  • C. Freezing
  • D. none of the above
Answer: A — Heat exchangers
Interbarrier spaces of Type A independent tanks must be continuously inerted with dry nitrogen gas.

5. Heat exchanger's standby heat exchanger have a capacity ____________ of the largest required capacity for pressure control.

  • A. lack of 25%
  • B. need of 25%
  • C. in excess of 25%
  • D. inadequacy of 25%
Answer: C — in excess of 25%
Hold spaces surrounding Type C pressure vessel tanks may be filled with dry air provided gas detection is installed.

6. Interbarrier and hold spaces associated with cargo containment systems for ______________ requiring full or partial secondary barriers shall be inerted with a suitable dry inert gas

  • A. Inert gas
  • B. flammable gases
  • C. inflammable gases
  • D. Green gas
Answer: B — flammable gases
Gas detection in interbarrier spaces provides immediate warning of primary barrier leaks or membrane failure.

7. Interbarrier and hold spaces associated with cargo containment systems are kept inerted with make-up gas provided by a shipboard _________________

  • A. flammable gas generation system
  • B. toxic gas generation system
  • C. inert gas generation system
  • D. Green gas generation system
Answer: C — inert gas generation system
Boil-off gas management systems must prevent fuel tank pressure from exceeding the Maximum Allowable Relief Valve Setting (MARVS).

8. Equipment for the provision of _______________ of suitable quality to satisfy the expected demand for dry air shall be provided.

  • A. insufficient moistured air
  • B. insufficient dry air
  • C. sufficient dry air
  • D. sufficient moistured air
Answer: C — sufficient dry air
Gas Combustion Units (GCU) burn surplus boil-off gas in a controlled combustion chamber when engines cannot consume it.

9. The connections to the gas piping systems are _______________

  • A. non-permanent
  • B. permanent
  • C. hazardous
  • D. non-hazardous
Answer: A — non-permanent
Reliquefaction units compress and condense boil-off gas vapors back into liquid fuel to return to the storage tanks.

10. In connections to the gas piping systems, what are substituted for the valves?

  • A. single nonreturn valves
  • B. two nonreturn valves
  • C. multi nonreturn valves
  • D. two return valves
Answer: B — two nonreturn valves
Connections from inert gas systems to gas fuel piping must have two non-return valves and a spool piece to prevent backflow of gas into inert systems.

11. How is the arrangement for each space being inerted ?

  • A. none of the above
  • B. groups
  • C. isolated
  • D. multi space
Answer: C — isolated
Each space subject to inerting must be arranged with independent isolation valves and local sampling connections.

12. What is provided for controlling pressure in isolated spaces?

  • A. two nonreturn valves
  • B. closable non-return valve
  • C. relief valves
  • D. single nonreturn valves
Answer: C — relief valves
Pressure relief valves must be provided on all isolated inerted spaces to prevent overpressurization during purging.

13. What is the goal of material and general pipe design?

  • A. to ensure the safe handling of pipes
  • B. to ensure the safe handling of gas fuel
  • C. to ensure the safe handling of drinking water
  • D. to ensure the safe handling of cargoes
Answer: B — to ensure the safe handling of gas fuel
The goal of material and general piping design under the IGF Code is to ensure the safe, leak-free containment and handling of gas fuel under all operating conditions.

14. Under which condition goal of material and general pipe design works?

  • A. only on limited conditions
  • B. under all operating conditions
  • C. based on the best condition
  • D. based on the fuel
Answer: B — under all operating conditions
Piping systems and fuel containment materials must maintain ductile mechanical properties under all foreseeable operating conditions down to design minimum temperatures.

15. What does goal of material and general pipe design minimize?

  • A. risk personnel
  • B. both (a) and (b)
  • C. none of the above
  • D. the risk to the ship
Answer: B — both (a) and (b)
Proper piping and containment design minimizes the risk of gas leakage, fire, and structural hull damage.

16. What is fuel piping capable of?

  • A. eliminate vaccum space
  • B. eliminate thermal expansion
  • C. absorbing thermal expansion
  • D. absorbing vaccum space
Answer: C — absorbing thermal expansion
Fuel piping arrangements must incorporate expansion loops or bellows capable of absorbing thermal contraction during cryogenic cooldown.

17. In Provision made in Functional requirements, fuel tanks from excessive stresses are due to _________

  • A. none of the above
  • B. pressure movement
  • C. vaccum movement
  • D. thermal movement
Answer: D — thermal movement
Functional requirements under the IGF Code mandate that fuel tanks and piping must be protected from excessive stresses caused by thermal contraction and expansion.

18. What is not essential to the structural completeness of the ship's hull?

  • A. An independent tank
  • B. none of the above
  • C. Dependent tank
  • D. Enclosed tank
Answer: A — An independent tank
An independent tank is a self-supporting fuel container that does not contribute to the structural strength or completeness of the ship's hull.

19. Which tank contains the fuel-containment envelope which forms part of the ship's hull and by the same loads which stress the contiguous hull structure?

  • A. none of the above
  • B. Gravity tank
  • C. Integral tank
  • D. both (a) and (b)
Answer: C — Integral tank
An integral tank is a fuel containment envelope that forms part of the ship's hull structure and is stressed by the same loads as the adjacent hull.

20. Which type of test covers the tensile strength not less than the specified minimum tensile strength?

  • A. Charpy V-notch impact tests
  • B. Tensile tests
  • C. Bend tests
  • D. All of the above
Answer: B — Tensile tests
Tensile testing of welded piping joints verifies that the ultimate tensile strength is not less than the specified minimum tensile strength of the base metal.

21. Which type of test conducted at the temperature prescribed for the base material being joined?

  • A. Tensile tests
  • B. All of the above
  • C. Bend tests
  • D. Charpy V-notch impact tests
Answer: D — Charpy V-notch impact tests
Charpy V-notch impact tests are conducted at prescribed minimum design temperatures to verify material resistance to brittle fracture.

22. What is the unit of P, design pressure?

  • A. K
  • B. Pa
  • C. bar
  • D. mm
Answer: C — bar
In piping design formulas, design pressure 'P' is standardly expressed in bar (or MPa).

23. In the theoretical thickness, to=PD/(20Ke + P) (mm), What is D?

  • A. pressure volume
  • B. theoretical thickness
  • C. outside diameter
  • D. PRESSURE
Answer: C — outside diameter
In the standard pipe wall thickness formula, 'D' represents the outside diameter of the pipe.

24. In the theoretical thickness, What is the unit of D, outside diameter?

  • A. Newtons
  • B. Bar
  • C. km
  • D. mm
Answer: D — mm
In pipe wall thickness calculations, outside diameter 'D' is standardly measured in millimeters (mm).

25. In IGF Code, Gas only engine means

  • A. two stroke engine
  • B. a power generating engine capable of operating on gas-only and not able to switch over to of fuel operation
  • C. four stroke engine
  • D. a power generating engine capable of operating on gas-only and able to switch over to oil fuel operation
Answer: A — two stroke engine
A gas-only engine operates solely on gas fuel without diesel pilot injection, utilizing spark ignition systems.

26. When assessing LNG fire risk in Hazardous and Safety Zones for LNG bunkering, which possible source of ignition would be caused by X ray apparatus, radioactive material, absorption of energy leads to heating up?

  • A. Lightning strike
  • B. lonizing radiation
  • C. Ultrasound
  • D. Adiabatic compression and shock wave
Answer: A — Lightning strike
Assessing LNG fire risk in hazardous zones requires identifying all potential ignition sources, leak frequencies, ventilation patterns, and emergency isolation capabilities.

27. Nitrogen pipes shall only be led through well ventilated spaces. Nitrogen pipes in enclosed spaces shall

  • A. Be fully welded
  • B. Have only a minimum of flange connections as needed for fitting of valves; and
  • C. Be as short as possible.
  • D. All of above
Answer: D — All of above
Nitrogen pipes routed through enclosed spaces must be all-welded, well-ventilated, and protected against accidental damage to prevent asphyxiation hazards.

28. In IGF Code, Certified safe type means

  • A. electrical equipment that is certified safe by the relevant authorities recognized by the Administration for operation in a flammable atmosphere based on a recognized standard
  • B. an enclosed space exceeding the maximum overpressure the container
  • C. measures provided to prevent the explosion pressure int a container
  • D. space is designed for, by releasing the overpressure through designated openings
Answer: A — electrical equipment that is certified safe by the relevant authorities recognized by the Administration for operation in a flammable atmosphere based on a recognized standard
Under the IGF Code, 'certified safe type' refers to electrical equipment certified by recognized authorities (ATEX/IECEx) for safe operation in flammable atmospheres.

29. Risk analysis is to be carried out in relevent accident scenarios to determine

  • A. Damage and deformities to the hull
  • B. Load and resistance factors
  • C. Damage to the machineries
  • D. Enviromental pollution
Answer: A — Damage and deformities to the hull
Accident scenario risk analysis evaluates collision, grounding, and fire impacts to determine potential damage and deformities to the ship's hull and fuel containment.

30. What according to you shall be fitted in every bunkering line close to the connectin point?

  • A. A manually operated valve.
  • B. A combined manually operated and remote valve.
  • C. A remote operated valve.
  • D. none of the above.
Answer: B — A combined manually operated and remote valve.
A combined manually operated stop valve and remote emergency shutdown valve must be fitted in every bunkering line close to the manifold connection point.

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