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AFF exit exam questions and answers — Set 7 — Advanced Fire Fighting

Set 7 of the Advanced Fire Fighting (AFF) exit exam bank — 30 of 517 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 7 — 30 AFF exit exam questions with answers

1. An extinguishing agent which effectively cools, dilutes combustible vapors, removes oxygen, and provides a heat and smoke screen is:

  • A. Water fog
  • B. Halon gas
  • C. Dry chemical powder formulation
  • D. Aqueous film-forming foam solution
Answer: A — Water fog
Water fog, when applied correctly, has multiple extinguishing properties. It cools the fuel below its ignition temperature, dilutes combustible vapors, displaces oxygen, and provides a screen against radiant heat and smoke.

2. The expansion of LFL is:

  • A. Light Flame Location
  • B. Liquid Fuel Line
  • C. Lower Flammable Limit
  • D. Low Flashpoint Liquid
Answer: C — Lower Flammable Limit
LFL stands for Lower Flammable Limit, which is the minimum concentration of a flammable gas or vapor in air that will burn or explode when an ignition source is present. This concept is critical for assessing fire and explosion hazards.

3. Which statement describes the primary process by which fires are extinguished by dry chemical?

  • A. The active agent drops fuel core parameters past absolute freezing margins
  • B. The dry chemical creates a dense visual foam overlay block
  • C. It relies on heavy moisture transformation into structural vapor screens
  • D. The dry chemical powder attacks the fuel and oxygen chain reaction
Answer: D — The dry chemical powder attacks the fuel and oxygen chain reaction
Dry chemical powders primarily extinguish fires by interrupting the chemical chain reaction of combustion. They also have a slight cooling effect and can form a barrier between the fuel and oxygen.

4. What is the most important consideration when determining to fight an electrical fire?

  • A. Danger of shock to personnel
  • B. Shutting down auxiliary lighting networks across accommodation spaces
  • C. The replacement costs of burnt circuitry components
  • D. The clean-up time required for active extinguishing residue
Answer: A — Danger of shock to personnel
When fighting electrical fires, the primary concern is the risk of electric shock to personnel. This risk necessitates the use of appropriate extinguishing agents that do not conduct electricity.

5. If you see an oil leakage, you clean it immediately. This is an example of:

  • A. Good housekeeping
  • B. ISO structural standard declaration rules
  • C. Deck log monitoring instructions
  • D. Preventive machinery tuning parameters
Answer: A — Good housekeeping
Promptly cleaning up oil leakages is an essential practice known as good housekeeping. Maintaining a clean and orderly environment prevents slip hazards and potential fire risks.

6. When dry chemical extinguishers are used to put out Class B fires, there is a danger of reflash because dry chemical:

  • A. Reacts aggressively with marine steel materials
  • B. Vaporizes into flammable gas compounds under heat exposure
  • C. Does little or no cooling
  • D. Displaces air structures for only a few seconds
Answer: C — Does little or no cooling
Dry chemical agents are effective at suppressing Class B fires by interrupting the chemical reaction, but they offer minimal cooling. This lack of cooling capability means that the fuel can still vaporize and re-ignite if the heat source persists.

7. Which of the following fire extinguishing agents has the greatest capacity for heat absorption?

  • A. Carbon dioxide gas jet
  • B. Dry chemical powder spray
  • C. Mechanical foam blanket expansion
  • D. Water fog
Answer: D — Water fog
Water fog, or spray, has the greatest capacity for heat absorption among the listed agents due to water's high latent heat of vaporization. This rapid cooling is crucial for extinguishing fires.

8. The expansion of IBC code is:

  • A. International Bilge Control code
  • B. International Bulk Cargo code
  • C. International Bulk Chemical code
  • D. Intermaritime Boiler Construction code
Answer: C — International Bulk Chemical code
The IBC Code, or International Bulk Chemical Code, provides regulations for the carriage of dangerous chemicals in bulk by sea. It is part of the IMO's framework for maritime safety and environmental protection.

9. As compared to carbon dioxide, dry chemical has which advantage?

  • A. Greater range
  • B. It is non-toxic inside confined spaces
  • C. It offers significant localized thermal cooling effects
  • D. It leaves no visible residue cleanup footprint on components
Answer: A — Greater range
Dry chemical extinguishers have a longer discharge range compared to carbon dioxide extinguishers. This allows firefighters to tackle fires from a safer distance.

10. Which of the listed firefighting agents and associated applications provide the largest shielding effect for the firefighter?

  • A. Continuous carbon dioxide stream jet
  • B. Low velocity water fog
  • C. Straight high-velocity water jet
  • D. High-expansion chemical foam spray
Answer: B — Low velocity water fog
Low velocity water fog provides a significant shielding effect for firefighters by absorbing heat and producing steam, which displaces oxygen and limits flame spread. This creates a safer working environment.

11. An example of a type of smoke detector is the:

  • A. Visual infrared flame scanner screen
  • B. Ionization type
  • C. Hydrostatic expansion capsule sensor
  • D. Thermal differential bimetallic link switch
Answer: B — Ionization type
The ionization type smoke detector is a common fire detection device that works by monitoring changes in electrical conductivity within an ionization chamber.

12. Which firefighting agent is most effective in removing heat?

  • A. Carbon dioxide vapor stream
  • B. Dry chemical powder blanket throw
  • C. Mechanical structural foam solution
  • D. Water spray
Answer: D — Water spray
Water spray, including water fog, is the most effective firefighting agent for removing heat from a fire. Its high latent heat of vaporization allows it to absorb a significant amount of thermal energy as it turns into steam.

13. When water fog is used as an extinguishing agent, the fire is extinguished principally by the:

  • A. Displacement of active fuel structures safely
  • B. Exclusion of atmospheric nitrogen elements
  • C. Chemical breakdown of active free radicals
  • D. Absorption of heat
Answer: D — Absorption of heat
When water fog is applied to a fire, its primary extinguishing mechanism is the rapid absorption of heat. As the water vaporizes into steam, it cools the fuel below its ignition temperature.

14. Fire extinguishers of sizes 3, 4, and 5 are designated as:

  • A. Hand portable
  • B. Semi-portable
  • C. Fixed system bank units
  • D. Auxiliary utility modules
Answer: B — Semi-portable
Fire extinguishers with sizes 3, 4, and 5 (typically kilograms or pounds) are classified as semi-portable. They are too heavy to be easily carried by one person but can be moved with effort.

15. Dangerous goods are classified into how many groups?

  • A. Three groups
  • B. Five groups
  • C. Twelve groups
  • D. Nine groups
Answer: D — Nine groups
Dangerous goods, as defined by international regulations like the IMDG Code, are classified into nine hazard classes based on their properties and the risks they pose.

16. The discharge from a carbon dioxide fire extinguisher should be directed:

  • A. At the top perimeter layout of smoke clouds
  • B. Directly into adjacent ventilation return trunks
  • C. At the base of the flames
  • D. In wide looping circles across structural partition bulkheads
Answer: C — At the base of the flames
The discharge from a carbon dioxide fire extinguisher should always be directed at the base of the flames. This is where the fuel is being vaporized and combustion is occurring, allowing CO2 to displace oxygen and cool the fuel.

17. Which statement is true concerning the use of dry chemical extinguishers?

  • A. You should direct the spray at the base of the fire
  • B. They are deployed safely on metal fires like sodium or magnesium
  • C. You should direct the spray at the top edges of structural smoke screens
  • D. They provide deep cooling to prevent any risk of re-ignition
Answer: A — You should direct the spray at the base of the fire
When using dry chemical extinguishers, the spray should always be directed at the base of the fire. This action smothers the fire by interrupting the chemical chain reaction and forming a barrier.

18. What is the minimum number of portable fire extinguishers that must be carried on ships of 1000 GRT and above?

  • A. Eight
  • B. Three
  • C. Five
  • D. Two
Answer: C — Five
According to SOLAS regulations, ships of 1000 GRT and above must carry a minimum of five portable fire extinguishers, ensuring adequate fire-fighting capability across the vessel.

19. What is the primary function of the emergency fire pump isolate valve fitted on main deck?

  • A. Prevent backflow to sea chest
  • B. Divert water to bilges
  • C. Isolate engine room fire main from deck fire main
  • D. Increase fire water pressure to accommodation
Answer: C — Isolate engine room fire main from deck fire main
The isolation valve ensures deck fire main remains pressurized if engine room fire line ruptures.

20. Under SOLAS, what is the minimum duration for SCBA cylinder duration calculation margin?

  • A. 45 minutes at standard atmosphere
  • B. 15 minutes at 20 L/min breathing rate
  • C. 60 minutes continuous flow
  • D. 30 minutes at 40 L/min breathing rate
Answer: D — 30 minutes at 40 L/min breathing rate
Standard SCBA cylinder nominal duration calculation is based on 40 L/min consumption rate.

21. What type of fixed fire extinguishing system is mandatory for paint lockers exceeding specified floor area?

  • A. Fixed CO2 or water-sprinkling system
  • B. Dry powder system
  • C. High expansion foam only
  • D. Inert gas generator
Answer: A — Fixed CO2 or water-sprinkling system
SOLAS Chapter II-2 requires paint lockers to be protected by fixed fire extinguishing system suitable for flammable liquids.

22. What action must be taken regarding mechanical ventilation before releasing CO2 into engine room?

  • A. Open skylights for pressure relief
  • B. Keep exhaust fans running to remove smoke
  • C. Stop all fans and close all dampers tight
  • D. Set ventilation to 50% capacity
Answer: C — Stop all fans and close all dampers tight
Stopping ventilation prevents loss of CO2 concentration and starves fire of oxygen.

23. What is the main advantage of High-Expansion Foam in engine room bilges?

  • A. Rapidly fills volume and smothers fire without liquid weight accumulation
  • B. Cools hot steel faster than water jet
  • C. Conducts electricity safely
  • D. Absorbs oil completely
Answer: A — Rapidly fills volume and smothers fire without liquid weight accumulation
High-expansion foam expands up to 1000:1 ratio filling large structural spaces quickly.

24. How often must fixed CO2 cylinder weight/pressure checks be conducted on ships?

  • A. Annually by certified technician or competent officer
  • B. Monthly by chief officer
  • C. Every 2 years
  • D. Every 5 years during drydock
Answer: A — Annually by certified technician or competent officer
Annual inspection verifies cylinder content level and detects potential slow leaks.

25. What is the International Shore Connection used for?

  • A. Shore electrical power supply
  • B. Connecting shore fire water supply to ship fire main
  • C. Bunkering fuel from shore
  • D. Discharging bilges to shore
Answer: B — Connecting shore fire water supply to ship fire main
The International Shore Connection allows standardized coupling to shore fire hoses regardless of port fittings.

26. What is boundary cooling in shipboard firefighting?

  • A. Cooling sea chest strainers
  • B. Cooling adjacent bulkheads and decks to prevent heat transfer and fire spread
  • C. Cooling the fire hose nozzle
  • D. Cooling the SCBA wearer with water spray
Answer: B — Cooling adjacent bulkheads and decks to prevent heat transfer and fire spread
Boundary cooling prevents conduction of heat to neighboring compartments and stops fire propagation.

27. Which nozzle spray setting is recommended when advancing on an interior cabin fire?

  • A. Shut off until inside cabin
  • B. Wide fog spray at maximum pressure
  • C. Solid jet stream directly at ceiling
  • D. Narrow fog spray for protection and heat absorption
Answer: D — Narrow fog spray for protection and heat absorption
Narrow fog provides protective water screen while absorbing heat efficiently.

28. What safety mechanism prevents accidental discharge of a fixed CO2 total flooding system?

  • A. Breakable glass seal on main manifold
  • B. Hydraulic interlock from bridge
  • C. Master key held only by Captain
  • D. Two-step control valve box with alarm microswitches
Answer: D — Two-step control valve box with alarm microswitches
SOLAS requires a dedicated cabinet with pre-discharge alarm activated upon opening cabinet door.

29. Emergency response services to a security incident do not include:

  • A. Police
  • B. Military
  • C. RSO
  • D. Fire services
Answer: C — RSO
A Recognized Security Organization (RSO) is an organisation authorised by the Administration under the ISPS Code to carry out security assessments, plan approval and verification on its behalf. It is not an emergency responder; police, military and fire services are the agencies that respond to an actual security incident.

30. What is auto-ignition?

  • A. The ignition of a combustible material without initiation by a spark or flame, when the material has been raised to a temperature at which self-sustaining combustion occurs
  • B. Automatic ignition of material in a hot atmosphere
  • C. Ignition of materials when they come in contact with each other
  • D. Ignition caused by a mixture of vapours given off by cargoes
Answer: A — The ignition of a combustible material without initiation by a spark or flame, when the material has been raised to a temperature at which self-sustaining combustion occurs
ISGOTT defines auto-ignition as ignition of a combustible material without any external spark or flame once it has been heated to its auto-ignition temperature. Hot surfaces such as exhaust manifolds or steam pipes can therefore ignite oil vapour or spray without any open flame being present.

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