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AIGF exit exam questions and answers — Set 9

Set 9 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 9 — 30 AIGF exit exam questions with answers

1. Speed recovery solutions can save fuel upto

  • A. 1%
  • B. 20-30%
  • C. 2%
  • D. 4-11%
Answer: D — 4-11%
Speed reduction and operational efficiency measures (slow steaming and hull optimization) can deliver substantial fuel savings of 4% to 11% or more.

2. Coating is done to reduce ___________

  • A. air resistance
  • B. oil resistance
  • C. None of the above
  • D. hull sytems
Answer: A — air resistance
Aerodynamic superstructure fairings and low-friction hull coatings reduce aerodynamic and hydrodynamic resistance, improving overall vessel propulsive efficiency.

3. ________ is an engine for reduction of the vessels maximum speed to increase the efficiency by limiting the potential power output

  • A. over rating
  • B. rerating
  • C. None of the above
  • D. derating
Answer: D — derating
Engine derating involves limiting the maximum power rating of a marine engine to optimize its thermal efficiency and specific fuel consumption at lower operating speeds.

4. LNG fuel should have after treatment systems like ___________

  • A. oxidation catalyst
  • B. nitrogen catalyst
  • C. hydrogen catalyst
  • D. helium catalyst
Answer: A — oxidation catalyst
Methane oxidation catalysts (MOC) are exhaust aftertreatment devices designed to oxidize residual unburned methane (methane slip) in lean-burn gas engine exhausts.

5. _______ should have after treatment systems like oxidation catalyst

  • A. petrol
  • B. LNG fuel
  • C. coal
  • D. gas fuel
Answer: B — LNG fuel
LNG-fueled lean-burn Otto-cycle engines utilize oxidation catalysts to reduce carbon monoxide, unburned hydrocarbons, and methane slip.

6. Slow steaming is otherwise called

  • A. maxrating of the engine
  • B. rerating of the engine
  • C. derating of the engine
  • D. duerating of the engine
Answer: C — derating of the engine
Slow steaming is an operational strategy that involves reducing vessel transit speed and derating main engines to achieve significant fuel and emissions savings.

7. The cooling jacket of a hybrid turbo charger is made up of which material

  • A. aluminium
  • B. stainless steel
  • C. steel
  • D. silver
Answer: A — aluminium
The water-cooling jacket on high-speed hybrid turbocharger alternators is commonly fabricated from corrosion-resistant marine aluminum alloys.

8. GCU means ___________________

  • A. Gas Consumption Unit
  • B. Gas Combustion Unit
  • C. Goods Combustion Unit
  • D. Gas Combining Unit
Answer: B — Gas Combustion Unit
GCU stands for Gas Combustion Unit, a dedicated thermal oxidizer on LNG-fueled ships that safely burns excess boil-off gas when engines cannot consume it.

9. _____________ utilized for gas freeing of tanks may be provided externally to the ship.

  • A. Green gas
  • B. Non-Toxic gas
  • C. Toxic gas
  • D. Inert gas
Answer: D — Inert gas
Inert gas (such as liquid nitrogen) used for purging and gas-freeing fuel tanks may be supplied from shoreside tanker trucks during bunkering or drydocking.

10. Spaces surrounding fuel tanks is filled with which type of air?

  • A. vapour
  • B. cool air
  • C. moistured air
  • D. dry air
Answer: D — dry air
Hold spaces surrounding independent Type C fuel tanks are filled with dry air or inert gas and continuously monitored for pressure and flammable gas.

11. What is electrically bonded in ship's structure?

  • A. All gasketed pipe joints
  • B. All non-gasketed pipe joints
  • C. fresh water line
  • D. sea water line
Answer: A — All gasketed pipe joints
All gasketed pipe joints, flanges, and flexible hoses in fuel systems must be electrically bonded with copper bonding straps to prevent static charge accumulation.

12. All pipelines isolated in a liquid full condition are provided with ___________

  • A. diaphgramvalves
  • B. butterfly valves
  • C. relief valves
  • D. control valves
Answer: C — relief valves
Thermal relief valves must be installed on any pipeline section that can be isolated while full of liquid to prevent overpressurization from thermal expansion.

13. Pipework contain ____________ which is thermally insulated to an extent which will minimize condensation of moisture

  • A. low temperature liquid
  • B. high temperature liquid
  • C. low pressure liquid
  • D. high pressure liquid
Answer: A — low temperature liquid
Cryogenic fuel pipework is thermally insulated with aerogel, polyurethane, or perlite to prevent ambient heat ingress and avoid structural moisture condensation.

14. Pipework contain low temperature liquid or gas which is thermally insulated to an extent which will ___________

  • A. maximize condensation of moisture
  • B. minimize evaporation of moisture
  • C. maximize evaporation of moisture
  • D. minimize condensation of moisture
Answer: D — minimize condensation of moisture
Thermal insulation on cryogenic gas piping prevents excessive heat ingress into the fuel and prevents heavy condensation and frost formation on external pipe surfaces.

15. Piping other than fuel supply piping, what is arranged in the double wall piping?

  • A. none of the above
  • B. sea water
  • C. fresh water
  • D. cabling
Answer: D — cabling
Instrumentation cabling and tracing lines associated with gas fuel supply systems may be routed inside double-wall piping ducts provided they are Ex-certified.

16. Piping other than cabling, what is arranged in the double wall piping?

  • A. fuel supply piping
  • B. fresh water
  • C. none of the above
  • D. sea water
Answer: A — fuel supply piping
Fuel supply piping is routed inside double-walled outer ducts to contain any potential inner pipe leakage and provide an extraction pathway for gas detection.

17. What is provided that they do not create a source of ignition compromise the integrity of the double pipe?

  • A. closure
  • B. drain
  • C. entry
  • D. duct
Answer: D — duct
Double-wall ducts must be structurally designed and certified so that internal components do not create ignition sources or compromise duct integrity.

18. In the minimum wall thickness, t=(to + b + c)/(1 - a/100)(mm), What is to?

  • A. allowance for bending
  • B. corrosion allowance
  • C. theoretical thickness
  • D. design pressure
Answer: C — theoretical thickness
In the standard pipe wall thickness formula, 'to' represents the theoretical design wall thickness required to withstand internal working pressure.

19. Indicators fitted on the ____________ ,the engine control room and the manoeuvring platform operation of Main engine

  • A. none of the above
  • B. navigation bridge,
  • C. Pump room
  • D. Deck
Answer: B — navigation bridge,
The navigation bridge must be equipped with essential propulsion status indicators, gas trip alarms, and emergency shutdown controls.

20. Where is permanently installed gas detectors fitted?

  • A. remote operation
  • B. both (a) and (b)
  • C. the tank connection spaces
  • D. in all ducts around gas pipes
Answer: B — both (a) and (b)
Permanently installed gas detectors are fitted in tank connection spaces, double-wall pipe ducts, fuel preparation rooms, and machinery space exhaust hoods.

21. Where is redundant gas detection systems be provided?

  • A. ESD-protected detection space
  • B. ESD-protected machinery space
  • C. ESD-unprotected machinery space
  • D. ESD-unprotected detection space
Answer: B — ESD-protected machinery space
Redundant gas detection systems with dual optical/infrared detectors are mandatory in ESD-protected machinery spaces to ensure immediate fail-safe trip capability.

22. In which area electrical equipment or wiring are not installed unless essential for operational purposes or safety enhancement?

  • A. safe area
  • B. hazardous areas
  • C. protected area
  • D. Gas free area
Answer: B — hazardous areas
Electrical equipment and wiring must not be installed in hazardous zones unless strictly necessary for operational or safety functions and certified explosion-proof (Ex-rated).

23. How is the lighting system in hazardous areas be divided ?

  • A. at least five branch circuits
  • B. at least three branch circuits
  • C. single circuits
  • D. at least two branch circuits
Answer: D — at least two branch circuits
Lighting systems in explosion-hazardous areas must be divided between at least two independent branch circuits to prevent total darkness upon single-circuit tripping.

24. Where will the switches and protective devices interrupt all poles or phases are provided

  • A. non-hazardous area
  • B. Gas area
  • C. toxic area
  • D. hazardous area
Answer: A — non-hazardous area
Electrical switches, circuit breakers, and motor protection devices controlling hazardous area circuits must be located in non-hazardous gas-safe areas.

25. The liquefied gas fuel containment system structure and its structural components shall withstand _______________ without loss of containment

  • A. loads liable to occur during its construction
  • B. testing
  • C. All the above
  • D. anticipated use in service
Answer: C — All the above
The fuel containment system structure must withstand all static, dynamic, sloshing, thermal, and collision loads without loss of containment.

26. The liquefied gas fuel containment system structure and its structural components shall withstand loads liable to occur during its ____________ without loss of containment.

  • A. testing
  • B. All the above
  • C. anticipated use in service
  • D. construction
Answer: B — All the above
Fuel containment structures are engineered to maintain structural integrity across their entire design operational lifetime without fatigue failure or leak development.

27. In Ultimate Design Conditions –the design shall take into account proper combinations of which type of loads?

  • A. All the above
  • B. External pressure
  • C. Dynamic loads due to the motion of the ship in all loading conditions
  • D. Internal pressure
Answer: A — All the above
Ultimate limit state design of fuel tanks accounts for simultaneous combinations of internal vapor pressure, liquid weight, hull girder deflection, and dynamic acceleration forces.

28. What are the accident design conditions addressed in IGF Code?

  • A. Collision
  • B. All the above
  • C. Fire
  • D. Flooded compartment causing buoyancy on tank
Answer: B — All the above
Accidental design conditions under the IGF Code evaluate extreme events including collision, grounding, secondary barrier liquid flooding, and external fire envelope exposure.

29. The hull structure may be designed as a secondary barrier where the liquefied gas fuel temperature at atmospheric pressure is not below minus 55°C on ______________

  • A. the design can be such that this temperature will not result in unacceptable hull stresses
  • B. the hull material can be suitable for the liquefied gas fuel temperature at atmospheric pressure
  • C. both (a) and (b)
  • D. none of the above
Answer: C — both (a) and (b)
The ship's inner hull structure may serve as a secondary barrier only when the fuel temperature at atmospheric pressure is not colder than -55°C and approved cryogenic grade steel is used.

30. In ship design and arrangement is to provide for

  • A. refuelling systems
  • B. mechanical protection of power generation equipment
  • C. space arrangements
  • D. All the above
Answer: D — All the above
The IGF Code establishes safety goals and mandatory functional requirements for the arrangement, installation, and operation of machinery using low-flashpoint fuels.

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