AFF EXIT EXAM SET 1 Welcome to your AFF EXIT EXAM SET 1 Name Email 1. Which toxic gas is a product of incomplete combustion, and is often present when a fire burns in a closed compartment? Carbon monoxide Nitric oxide Carbon dioxide Hydrogen sulfide 2. A fire starting by spontaneous combustion can be expected in which condition? Paints, varnish, or other liquid flammables are stowed in a dry stores locker. Inert cargoes such as pig iron are loaded in a wet condition. Clean mattresses are stored in contact with an electric light bulb. Oily rags are stowed in a metal pail. 3. Oily rags stored in a pile that is open to the atmosphere are a hazard because they may __________. deteriorate and give off noxious gasses attract lice and other vermin and serve as a breeding ground spontaneously heat and catch fire None of the above 4. The minimum concentration of a vapor in air which can form an explosive mixture is called the __________. auto-ignition point lower explosive limit (LEL) flash point threshold limit value (TLV) Basic Firefighting and 5. Accumulations of oily rags should be __________. kept in the paint locker discarded as soon as possible kept in nonmetal containers cleaned thoroughly for reuse 6. A fuel-air mixture below the lower explosive limit is too cool to burn rich to burn dense to burn lean to burn 7. The midships house of your break bulk ship is constructed with an interior stair tower from the main deck to the bridge. Under what circumstances may the doors from each deck to the stair tower be kept open when underway? They may be kept open if they can be automatically closed from the bridge. They are to be kept closed at all times. They can be kept open if the Muster List ("Station Bill") has personnel designated to close them in case of fire. They may be kept open if the ventilation or air conditioning system is shut down. 8. In the event of a fire, the doors to a stair tower must be closed to prevent the spread of fire by __________. convection conduction ventilation radiation 9. Fire may be spread by which means? Convection Direct radiation Conduction of heat to adjacent surfaces All of the above. 10. Convection spreads a fire by __________. heated gases flowing through ventilation systems the transfer of heat across an unobstructed space transmitting the heat of a fire through the ship's metal burning liquids flowing into another space Basic Firefighting and 11. Radiation spreads a fire by __________. transmitting the heat of a fire through the ship's metal burning liquids flowing into another space heated gases flowing through ventilation systems transferring heat across an unobstructed space 12. The spread of fire is prevented by __________. shutting off the oxygen supply removing combustibles from the endangered area cooling surfaces adjacent to the fire All of the above. 13. To prevent the spread of fire by convection you should __________. shut off all electrical power close all openings to the area remove combustibles from direct exposure cool the bulkhead around the fire 14. The spread of fire is NOT prevented by __________. removing combustibles from the endangered area removing smoke and toxic gases by ensuring adequate ventilation shutting off the oxygen supply cooling surfaces adjacent to the fire 15. Ventilation systems connected to a compartment in which a fire is burning are normally closed to prevent the rapid spread of the fire by __________. radiation conduction spontaneous combustion convection 16. The atmosphere in a tank is too rich when it is __________. incapable of supporting combustion because the hydrocarbon vapor content makes the atmosphere below the LFL (Lower Flammable Level) capable of supporting combustion incapable of supporting combustion because the hydrocarbon vapor content makes the atmosphere above the UFL (Upper Flammable Limit) in a noncombustible state which can be relied on to occur naturally on a regular basis 17. The atmosphere in a tank is too lean if it is __________. incapable of supporting combustion because the hydrocarbon content is below the LFL (Lower Flammable Limit) capable of supporting a fire once started not safe for ballasting capable of supporting combustion because the hydrocarbon content is above the UFL (Upper Flammable Limit) 18. What is the generally accepted method of determining whether the atmosphere within a cargo tank is explosive, too rich, or too lean to support combustion? Use the open flame test on a small sample that has been taken from the tank. Send a gas sample ashore for laboratory analysis. Use an explosimeter. Enter the tank with an oxygen analyzer. 19. The explosive range of petroleum vapors mixed with air is 0% to 1% 1% to 10% 10% to 15% 12% to 20% 20. Small quantities of flammable liquids needed at a work site should be __________. in a metal container with a tight cap used only under the supervision and direction of a ship's officer used only when a pressurized fire hose is laid out ready for immediate use tightly capped and stowed with other tools near the job site when securing at the end of the day 21. Paints and solvents on a vessel should be __________. stored in a suitable gear locker covered at all times to protect from ignition sources returned to the paint locker after each use stored safely at the work site until work is completed 22. The hoods over galley ranges present what major hazard? They concentrate the heat of cooking and may raise surrounding flammable material to the ignition point. They inhibit the effective operation of fire fighting systems in combating deep fat fryer or range fires. In order to effectively draw off cooking heat they present a head-injury hazard to a person of average or more height Grease collects in the duct and filter and if it catches fire is difficult to extinguish. 23. Which of the following when removed will extinguish a fire? sodium carbon dioxide oxygen nitrogen 24. What is required in addition to the heat, fuel, and oxygen of the fire triangle to have a fire? Pressure Electricity Smoke Chain reaction 25. All of the following are part of the fire triangle EXCEPT __________. oxygen electricity fuel heat 26. Except in rare cases, it is impossible to extinguish a shipboard fire by __________. removing the fuel removing the heat interrupting the chain reaction removing the oxygen 27. Normally, the percentage of oxygen in air is __________. 16 (%) 18 (%) 21 (%) 25 (%) 28. The lowest temperature required to cause self-sustained combustion of a substance independent of any outside source of ignition is called __________. explosive range ignition temperature combustion temperature flash point 29. What is LEAST likely to cause ignition of fuel vapors? Loose wiring Explosion proof lights Static electricity An open running electric motor 30. What is the maximum oxygen content below which flaming combustion will no longer occur? 1% 10% 15% 21%
