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AIGF exit exam questions and answers — Set 1

Set 1 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 26 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 1 — 30 AIGF exit exam questions with answers

1. Insulation spaces are continually supplied with an inert gas as part of ______________

  • A. leak detection system
  • B. lever detection system
  • C. lever defining system
  • D. leak defining system
Answer: A — leak detection system
Under the IGF Code, insulation spaces and interbarrier spaces surrounding liquefied gas fuel tanks are continuously supplied with dry inert gas (nitrogen) to prevent moisture ingress and enable rapid leak detection by gas monitoring.

2. In IGF Code, Secondary barrier means

  • A. none of the above
  • B. to prevent the lowering of the temperature of the ship’s structure to an unsafe level
  • C. the liquid-resisting outer element of a fuel containment system designed to afford temporary containment of any envisaged leakage of liquid fuel through the primary barrier
  • D. both (a) and (b)
Answer: D — both (a) and (b)
Under the IGF Code, a secondary barrier is the liquid-resisting outer element of a fuel containment system designed to afford temporary containment of any envisaged leakage of liquid fuel through the primary barrier and prevent lowering the ship's hull structure temperature to unsafe levels.

3. In IGF Code, Secondary protection means

  • A. the liquid-resisting outer element of a fuel containment system designed to afford temporary containment of any envisaged leakage of liquid fuel through the primary protection
  • B. failure of the first barrier will not lead to a hazard because of the secondary protection
  • C. failure of the first barrier will lead to a hazard because of the primary protection
  • D. the liquid-resisting outer element of a fuel containment system designed to afford temporary containment of any envisaged leakage of liquid fuel through the secondary protection
Answer: B — failure of the first barrier will not lead to a hazard because of the secondary protection
In IGF Code safety philosophy, secondary protection ensures that any failure or leakage of the primary fuel barrier will not escalate into a catastrophic hazard to the ship or personnel.

4. What concept is applied to minimize the probability of a gas explosion in a machinery space with gas- fuelled machinery ?

  • A. none of the above
  • B. both (a) and (b)
  • C. Emergency Shutdown-protected machinery spaces
  • D. Gas safe machinery spaces
Answer: B — both (a) and (b)

5. What is Gas safe machinery spaces?

  • A. both (a) and (b)
  • B. Arrangements in machinery spaces are such that the spaces are considered non-hazardous
  • C. none of the above
  • D. Arrangements in machinery spaces are such that the spaces are considered gas safe under all conditions, normal as well as abnormal conditions
Answer: D — Arrangements in machinery spaces are such that the spaces are considered gas safe under all conditions, normal as well as abnormal conditions

6. What is Emergency Shutdown-protected machinery spaces?

  • A. Arrangements in machinery spaces are such that the spaces are considered gas safe under all conditions, normal as well as abnormal conditions
  • B. Arrangements in machinery spaces are such that the spaces are considered non-hazardous under normal conditions, but under certain abnormal conditions may have the potential to become hazardous
  • C. none of the above
  • D. both (a) and (b)
Answer: B — Arrangements in machinery spaces are such that the spaces are considered non-hazardous under normal conditions, but under certain abnormal conditions may have the potential to become hazardous
Double-wall piping provides secondary containment for gas fuel lines in machinery spaces; the annular space is either continuously ventilated under negative pressure or pressurized with inert gas to detect leaks.

7. What will be the Gas safe machinery space failure?

  • A. none of the above
  • B. single failure may result in a gas release into the space
  • C. single failure cannot lead to release of fuel gas into the machinery space
  • D. probable maximum leakage scenario due to technical failures
Answer: C — single failure cannot lead to release of fuel gas into the machinery space
Gas fuel piping passing through enclosed spaces must be enclosed in double-walled ducts or pipes with continuous mechanical extraction ventilation of at least 30 air changes per hour.

8. Potential dangers to be avoided include

  • A. exposure of ship materials to temperatures below acceptable limits
  • B. All the above
  • C. flammable fuels spreading to locations with ignition sources
  • D. toxicity potential
Answer: B — All the above
Emergency Shutdown (ESD) systems are designed to automatically isolate fuel supplies, trip fuel pumps, and close master gas valves within seconds of detecting a hazardous condition.

9. The design life of fixed liquefied gas fuel containment system __________ whichever is greater

  • A. both (a) and (b)
  • B. none of the above
  • C. should not be less than the design life of the ship
  • D. 20 years
Answer: A — both (a) and (b)
Gas detection in double-wall pipe ducts triggers alarms at 20% LEL and initiates automatic fuel shut-off (ESD) at 40% LEL.

10. In Liquefied gas fuel containment, The design life of portable tanks shall not be less than

  • A. both (a) and (b)
  • B. sthe design life of the ship
  • C. none of the above
  • D. 20 years
Answer: D — 20 years
Fuel containment systems must be designed to withstand all anticipated static and dynamic loads during vessel transit, including sloshing, thermal expansion, and ship motions.

11. The design of the secondary barrier, including spray shield if fitted will be __________

  • A. physical, mechanical or operational events within the liquefied gas fuel tank
  • B. All the above
  • C. it is capable of containing any envisaged leakage of liquefied gas fuel for a period of 15 days
  • D. failure of a support or an attachment to the hull structure will not lead to loss of liquid tightness of both the primary and secondary barriers
Answer: B — All the above
Type A independent tanks are designed primarily using classical ship structural analysis and require a complete secondary barrier to contain liquid spills.

12. The partial secondary barrier include means to detect a leak in the primary barrier, provision such as a _____________

  • A. spray shield to deflect any liquefied gas fuel down into the partial secondary barrier
  • B. none of the above
  • C. both (a) and (b)
  • D. means to dispose of the liquid which may be by natural evaporation
Answer: C — both (a) and (b)
Type B independent tanks are designed using refined analytical models and fracture mechanics (leak-before-failure principle), requiring only a partial secondary barrier (drip tray).

13. What are the fundamentals to safety gas carriers?

  • A. All the above
  • B. air locks
  • C. segregation
  • D. seperation
Answer: A — All the above
Type C independent tanks are designed as pressure vessels where the design pressure and safety factors eliminate the need for a secondary barrier.

14. In design loads, Load categories contains __________

  • A. All the above
  • B. accidental load
  • C. environmental load
  • D. permanent load
Answer: A — All the above
Membrane fuel containment systems utilize a thin, non-self-supporting metallic membrane supported by load-bearing insulation attached to the ship's inner hull.

15. In design loads, the extent to which these loads depends on the ____________

  • A. type of water
  • B. type of tank
  • C. Man taking sounding
  • D. design engineer
Answer: B — type of tank
Bunkering stations must be located on open decks with natural ventilation or in dedicated spaces with mechanical ventilation and water spray deluge systems.

16. Permanent loads- Gravity loads depends on __________

  • A. loads caused by towers
  • B. weight of tank
  • C. All the above
  • D. thermal insulation weight load
Answer: C — All the above
Drip trays made of suitable cryogenic materials must be fitted beneath bunkering manifolds to prevent cryogenic liquid spills from damaging the hull structure.

17. Gravity loads of structures and equipment acting ____________ on the tank

  • A. from air
  • B. from bottom
  • C. from no where
  • D. externally
Answer: D — externally

18. What is called Functional loads?

  • A. Loads arising from the operational use of the tank system
  • B. none of the above
  • C. The weight of tank, thermal insulation, loads caused by towers and other attachments
  • D. Gravity loads of structures and equipment acting externally on the tank
Answer: A — Loads arising from the operational use of the tank system

19. Permanent external loads

  • A. none of the above
  • B. Loads arising from the operational use of the tank system
  • C. The weight of tank, thermal insulation, loads caused by towers and other attachments
  • D. loads of structures and equipment acting externally on the tank
Answer: D — loads of structures and equipment acting externally on the tank
Under STCW Table A-V/3-2, advanced IGF operations require strict adherence to approved safety procedures, permit-to-work protocols, and risk assessments.

20. Gravity loads

  • A. The weight of tank, thermal insulation, loads caused by towers and other attachments
  • B. Loads arising from the operational use of the tank system
  • C. loads of structures and equipment acting externally on the tank
  • D. none of the above
Answer: A — The weight of tank, thermal insulation, loads caused by towers and other attachments
Risk assessments and pre-job safety briefings are mandatory before conducting any maintenance or operational activity on gas fuel systems.

21. In structural analysis, ___________ may be used in combination with, or instead of, theoretical calculations.

  • A. integrity
  • B. dynamic tests
  • C. Model tests
  • D. gravity tests
Answer: C — Model tests
Fuel preparation rooms house compressors, pumps, vaporizers, and heat exchangers required to condition LNG fuel before supply to the engines.

22. In Load scenarios, What are the most unfavourable scenarios for all relevant phases are considered?

  • A. construction
  • B. handling
  • C. testing
  • D. All the above
Answer: D — All the above
Fuel containment structural design must evaluate the most unfavorable loading combinations across all operating phases, including bunkering, full load, sea voyage, sloshing, and emergency conditions.

23. Reliquefaction systems has to be sized in a sufficient way also in case of ____________

  • A. effective consumption
  • B. no or low consumption
  • C. greater consumption
  • D. high consumption
Answer: B — no or low consumption
Reliquefaction systems on LNG-fueled ships must be sized with sufficient redundancy to manage boil-off gas during periods of low or zero engine fuel consumption (such as port stays).

24. Thermal oxidation is done by consumption of the vapours according to the __________________.

  • A. regulations for ship
  • B. regulations for consumers
  • C. regulations for flag
  • D. regulations for cargo
Answer: B — regulations for consumers
Thermal oxidation of excess boil-off gas is carried out using Gas Combustion Units (GCU) or auxiliary boilers in compliance with environmental and consumer regulations.

25. Insulation spaces is provided to monitor the _______________

  • A. the quantity of fuel being supplied to individual spaces
  • B. the quantity of gas being supplied to individual spaces
  • C. the quantity of liquid being supplied to individual spaces
  • D. the quantity of vapour being supplied to individual spaces
Answer: B — the quantity of gas being supplied to individual spaces
Monitoring of insulation spaces ensures that inert gas atmosphere purity, pressure, and temperature are maintained, allowing early detection of primary barrier leakage.

26. In Gravity tank, what is the design pressure?

  • A. greater than 0.07 MPa gauge at the bottom of the tank
  • B. not greater than 0.07 MPa gauge at the bottom of the tank
  • C. not greater than 0.07 MPa gauge at the top of the tank
  • D. greater than 0.07 MPa gauge at the top of the tank
Answer: C — not greater than 0.07 MPa gauge at the top of the tank
Gravity tanks used for fuel storage have a maximum design vapor pressure not exceeding 0.07 MPa (0.7 bar) gauge measured at the top of the tank.

27. What will be covered by cofferdams acting as secondary barriers?

  • A. Tanks for high-flashpoint liquids
  • B. Tanks for high-flashpoint oils
  • C. Tanks for low-flashpoint liquids
  • D. Tanks for water
Answer: C — Tanks for low-flashpoint liquids
Tanks containing low-flashpoint liquid fuels require surrounding cofferdams or void spaces acting as secondary barriers to isolate them from adjacent compartments.

28. How is cofferdam arranged?

  • A. With gas detection and no possibility for water filling upon detection of leakage
  • B. With gas detection and possibility for water filling upon detection of leakage
  • C. With no gas detection and possibility for water filling upon detection of leakage
  • D. With no gas detection and no possibility for water filling upon detection of leakage
Answer: B — With gas detection and possibility for water filling upon detection of leakage
Cofferdams surrounding fuel tanks are fitted with continuous gas detection systems and arrangements for emergency water filling or inert gas purging upon detecting fuel leaks.

29. How will be the access to tanks and cofferdams?

  • A. be indirect from closed deck
  • B. be indirect from open deck
  • C. be direct from closed deck
  • D. be direct from open deck
Answer: D — be direct from open deck
Direct access to fuel tanks and surrounding cofferdams should be provided directly from open weather decks to avoid passing through enclosed accommodation or service spaces.

30. What is the minimum clear opening of hatches or manholes?

  • A. no less than 600 by 600 mm
  • B. none of the above
  • C. no greater than 800 by 800 mm
  • D. no less than 6000by 800 mm
Answer: A — no less than 600 by 600 mm
The IGF Code specifies that access hatches and manholes into fuel storage holds and void spaces must have a minimum clear opening of not less than 600 mm by 600 mm.

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