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AIGF exit exam questions and answers — Set 3

Set 3 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 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 AIGF exit exam questions with answers

1. In Piping fabrication, For design pressures in ______________ and design temperatures of minus 10°C or colder, backing rings will be removed.

  • A. 30 bar
  • B. 20 bar
  • C. 10 bar
  • D. 40 bar
Answer: C — 10 bar
In piping fabrication, for design pressures exceeding 10 bar and design temperatures of -10°C or colder, backing rings must be completely removed to prevent stress concentrations.

2. In Piping fabrication, For design pressures in 10 bar and design temperatures of ___________, backing rings will be removed.

  • A. minus 5°C
  • B. plus 10°C
  • C. minus 10°C
  • D. plus 5°C
Answer: C — minus 10°C
Backing rings must be removed from fuel piping butt welds when design pressures reach 10 bar and temperatures are -10°C or colder to eliminate root crevices and fatigue notches.

3. In Direct connections of Piping fabrication, ____________ with sleeves and related welding, having dimensions in accordance with recognized standards

  • A. socket welded joints
  • B. U- welded joints
  • C. T - welded joints
  • D. Slip-on welded joints
Answer: D — Slip-on welded joints
Slip-on welded sleeve joints must have standardized dimensions and are restricted to low-temperature or low-pressure auxiliary lines.

4. In Direct connections of Piping fabrication, Slip-on welded joints are only be used for instrument lines and open-ended lines with an ___________

  • A. internal diameter of 50 mm or more
  • B. external diameter of 50 mm or more
  • C. external diameter of 50 mm or less
  • D. internal diameter of 50 mm or less
Answer: C — external diameter of 50 mm or less
Slip-on welded joints are only permitted for open-ended lines and instrumentation lines having an external diameter of 50 mm or less.

5. In Direct connections of Piping fabrication, Slip-on welded joints are only be used for instrument lines and design temperatures not colder than _______________

  • A. minus 1000°C
  • B. minus 55°C
  • C. plus 55°C
  • D. minus 5000°C
Answer: B — minus 55°C
Slip-on welded joints are restricted to auxiliary piping systems with design temperatures not colder than -55°C.

6. In Direct connections of Piping fabrication, ____________ used for accessory lines and instrumentation lines with external diameters of 25 mm or less.

  • A. threaded coupling
  • B. All of the above
  • C. glued coupling
  • D. Screwed couplings
Answer: D — Screwed couplings
Screwed couplings are permitted only for accessory and instrumentation lines with an external diameter of 25 mm or less.

7. In Direct connections of Piping fabrication, Screwed couplings used for accessory lines and instrumentation lines with _______________

  • A. internal diameters of 25 mm or less
  • B. internal diameters of 25 mm or more
  • C. external diameters of 25 mm or less
  • D. external diameters of 25 mm or more
Answer: C — external diameters of 25 mm or less
Under IGF Code piping rules, threaded screwed fittings are limited to small-bore instrumentation and sampling lines of 25 mm OD or less.

8. In Direct connections of Flanged connections, Flanges in flange connections will be of ____________

  • A. t-welded type
  • B. slip-on or socket welded type
  • C. U welded type
  • D. butt welded type
Answer: B — slip-on or socket welded type
Flanged connections in fuel piping systems are generally restricted to welding neck, slip-on, or socket welded types approved for cryogenic service.

9. In Direct connections of Flanged connections, For all piping except open ended, what restrictions is applied?

  • A. For design temperatures colder than minus 55°C, only welded slip on flanges shall be used
  • B. For design temperatures colder than minus 55°C, only welded threaded flanges shall be used
  • C. For design temperatures colder than minus 55°C, only welded neck flanges shall be used
  • D. For design temperatures colder than minus 55°C, only welded lap flanges shall be used
Answer: C — For design temperatures colder than minus 55°C, only welded neck flanges shall be used
For design temperatures colder than -55°C, only approved welding neck flanges with full penetration butt welds are permitted on fuel piping.

10. In Direct connections of Flanged connections, For all piping except open ended, For design temperatures ___________ only welded neck flanges shall be used.

  • A. colder than minus 4400°C
  • B. colder than minus 55°C
  • C. colder than minus 3400°C
  • D. colder than minus 1000°C
Answer: B — colder than minus 55°C
Welding neck flanges are mandatory for all pressurized cryogenic fuel piping operating at temperatures colder than -55°C.

11. In Direct connections of Flanged connections, For design temperatures ____________ slip-on flanges shall not be used in nominal sizes above 100 mm

  • A. colder than minus 30°C
  • B. colder than minus 150°C
  • C. colder than minus 20°C
  • D. colder than minus 10°C
Answer: D — colder than minus 10°C
Slip-on flanges must not be used for nominal pipe sizes exceeding 100 mm when design temperatures are colder than -10°C.

12. In Direct connections of Flanged connections, For design temperatures colder than minus 10°C slip-on flanges will not be used in nominal sizes _________

  • A. above 10 mm
  • B. above 100 mm
  • C. above 250 mm
  • D. above 500 mm
Answer: B — above 100 mm
For temperatures colder than -10°C, slip-on flanges are prohibited for nominal pipe sizes above 100 mm due to thermal stress and bending limitations.

13. In Direct connections of Flanged connections, welded flanges shall not be used in nominal sizes _______________

  • A. below 50 mm
  • B. below 25 mm
  • C. above 25 mm
  • D. above 50 mm
Answer: D — above 50 mm
Socket welded flanges are prohibited on cryogenic gas piping for nominal pipe diameters above 50 mm.

14. Deep well pump is the type of ____________ cargo pump found on gas carriers.

  • A. diaphragm
  • B. reciprocating
  • C. centrifugal
  • D. gear
Answer: C — centrifugal
Deep-well pumps used on liquefied gas carriers and fuel tanks are vertical multi-stage centrifugal pumps submerged at the bottom of the tank.

15. In Deep well pump, the prime mover is usually an ________

  • A. hydraulic motor
  • B. none of the above
  • C. electric motor
  • D. both (a) and (b)
Answer: D — both (a) and (b)
The prime mover of a deep-well cargo pump is an explosion-proof electric motor or hydraulic motor mounted externally on top of the tank dome.

16. In Deep well pump, the motor is usually mounted on the top of the ________________

  • A. drives via long transmission shaft
  • B. none of the above
  • C. cargo tanks
  • D. both (a) and (b)
Answer: D — both (a) and (b)
The drive motor of a deep-well pump is installed in the gas-safe area or on top of the tank dome on the open weather deck.

17. In Deep well pump, the motor is usually mounted on the top of the cargo tanks and drives via ________

  • A. long transmission shaft
  • B. the pump assembly located in the bottom of the tank
  • C. through a double seal arrangement
  • D. All of the above
Answer: D — All of the above
The electric or hydraulic motor on top of the tank drives the submerged impeller stack at the bottom of the tank via an elongated vertical shaft enclosed in the discharge column.

18. In deep well pump, the cargo discharge pipeline surrounds the drive shaft and also it __________

  • A. heats up the bearings
  • B. the shaft bearings are cooled
  • C. both answer b and c
  • D. lubricated by the liquid being pumped
Answer: C — both answer b and c
In deep-well pump design, the discharge column pipe surrounds the central drive shaft and utilizes the pumped cargo liquid for lubricating the shaft intermediate bearings.

19. Under STCW Code Table A-V/3-2, what is the mandatory requirement regarding personal protective equipment (PPE) and safety gear during Advanced IGF Code operations?

  • A. Optional adherence based on vessel size
  • B. Strict compliance with approved safety procedures and flag state regulations
  • C. Verbal recommendation without documentation
  • D. Applicable only during drydock operations
Answer: B — Strict compliance with approved safety procedures and flag state regulations
STCW Code Table A-V/3-2 mandates strict compliance with approved safety protocols for Advanced IGF Code.

20. What specific safety precaution must be observed when managing personal protective equipment (PPE) and safety gear for Advanced IGF Code on board?

  • A. Delegating tasks exclusively to untrained crew members
  • B. Proceeding without informing the officer on watch
  • C. Conducting a thorough risk assessment and briefing all involved personnel prior to starting work
  • D. Disabling automated safety alarms to save time
Answer: C — Conducting a thorough risk assessment and briefing all involved personnel prior to starting work
Risk assessments and pre-job briefings ensure all team members understand hazards during Advanced IGF Code operations.

21. Which international regulation specifies the minimum standard for personal protective equipment (PPE) and safety gear concerning Advanced IGF Code?

  • A. STCW Code Section A-V/3-2 and relevant SOLAS/MARPOL conventions
  • B. Tonnage Measurement Convention 1969
  • C. International Load Line Certificate Annex 3
  • D. Port State Control advisory note only
Answer: A — STCW Code Section A-V/3-2 and relevant SOLAS/MARPOL conventions
STCW Code Section A-V/3-2 sets international standards for training and operational competency in Advanced IGF Code.

22. What is the mandatory design feature for fuel piping containing LNG on ships subject to IGF Code?

  • A. Double-walled piping with inert gas purging or ventilation in inter-barrier space
  • B. Single wall heavy duty schedule 160 steel
  • C. Plastic lined copper piping
  • D. Flexible rubber hose with steel braid
Answer: A — Double-walled piping with inert gas purging or ventilation in inter-barrier space
IGF Code mandates double-walled piping to prevent gas leakage into enclosed ship spaces.

23. Under IGF Code, what is the lower flammability limit (LFL) threshold to trigger Emergency Shutdown (ESD)?

  • A. 100% LFL
  • B. 50% LFL
  • C. 20% LFL in gas fuel preparation rooms or ducting
  • D. 5% LFL
Answer: C — 20% LFL in gas fuel preparation rooms or ducting
Gas detectors trigger alarm at 20% LFL and initiate automatic ESD at 40% LFL.

24. What gas is used to inert LNG fuel tanks and supply lines prior to gas-freeing?

  • A. Carbon Dioxide
  • B. Dry Nitrogen gas
  • C. Argon
  • D. Compressed Air
Answer: B — Dry Nitrogen gas
High-purity dry Nitrogen prevents formation of explosive mixtures during inerting.

25. What type of LNG tank is self-supporting independent Type C under IGF/IGC Code?

  • A. Prismatic Type A tank requiring full secondary barrier
  • B. Membrane tank integrated into hull
  • C. Spherical Kvaerner-Moss tank
  • D. Pressure vessel tank designed for working pressure above 2 bar gauge
Answer: D — Pressure vessel tank designed for working pressure above 2 bar gauge
Type C tanks are pressure vessels that do not require a full secondary barrier.

26. What safety device protects LNG fuel tanks from overpressure during BOG accumulation?

  • A. Vacuum relief valve only
  • B. Safety relief valves vented to dedicated vent mast
  • C. Automatic water spray valve
  • D. Rupture disc discharging into engine room
Answer: B — Safety relief valves vented to dedicated vent mast
Relief valves discharge safely into atmosphere high above deck via vent masts.

27. What parameter is monitored continuously in the inter-barrier space of LNG membrane tanks?

  • A. Oil content and pH
  • B. Water level and salinity
  • C. Oxygen percentage only
  • D. Gas concentration and temperature
Answer: D — Gas concentration and temperature
Monitoring gas and temperature detects primary barrier leaks early.

28. What type of gas detector is preferred for hydrocarbon gas detection in inert atmospheres?

  • A. Catalytic bead detector
  • B. Flame ionization detector
  • C. Infrared (IR) gas detector
  • D. Electrochemical cell
Answer: C — Infrared (IR) gas detector
IR gas detectors do not require oxygen to operate accurately, unlike catalytic bead sensors.

29. What is the function of the BOG (Boil-Off Gas) compressor on LNG fueled vessels?

  • A. Compress boil-off gas for use as fuel in main/auxiliary engines or boilers
  • B. Vent gas into cargo holds
  • C. Condense BOG back to sea water
  • D. Cool engine jacket water
Answer: A — Compress boil-off gas for use as fuel in main/auxiliary engines or boilers
BOG compressors raise gas pressure to required fuel injection levels.

30. What requirement applies to electrical equipment installed in IGF fuel preparation rooms?

  • A. Drip-proof industrial motor
  • B. Non-explosion proof with warning label
  • C. Standard marine IP54 enclosure
  • D. Certified safe type (Ex-d, Ex-i, Ex-e) for Zone 1 hazardous area
Answer: D — Certified safe type (Ex-d, Ex-i, Ex-e) for Zone 1 hazardous area
Hazardous Zone 1 areas mandate certified explosion-proof electrical equipment.

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