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REVIEW QUESTIONS
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Circle the letter of your choice 1 A rapid, self-sustaining oxidation process generating heat and light is commonly known as: (A) (B) (C) (D) fuel oxygen re pyrolysis
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2 The percentage of oxygen in air at sea level is approximately (A) (B) (C) (D) 15% 21% 26% 28%
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3 A rapid expansion of gases that have premixed prior to ignition is called (A) (B) (C) (D) an explosion an oxidizer an endothermic reaction spontaneous combustion
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CHAP 8: FIRE SCIENCE BASICS
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4 A detonation propagates at approximately what speed (A) (B) (C) (D) Less than 200 feet per second Less than 600 feet per second More than 600 feet per second but less than 800 feet per second More than 1,000 feet per second
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5 The primary ammable gas that ignites during a backdraft from the sudden in ux of air into an oxygen-starved room is (A) (B) (C) (D) nitrogen carbon monoxide carbon dioxide hydrogen
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6 A mechanical explosion caused by the weakening of a container shell due to heat via contact with re is referred to as a (A) (B) (C) (D) BLEVE backdraft de agration re triangle
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7 Spontaneous combustion is the result of what type of reaction (A) (B) (C) (D) BLEVE Exothermic Mechanical Endothermic
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8 An accurate statement describing the term known as pyrolysis is (A) (B) (C) (D) a physical explosion a rapid self-sustaining combustion process a decomposition reaction a container failure
9 The re triangle is a model used to aid in the understanding of the three major elements required for ignition Which of the following is not one of the elements of the re triangle (A) (B) (C) (D) Heat Fuel Oxidizer Chemical chain reaction
10 Another term used for heat as denoted in the re triangle model is (A) (B) (C) (D) oxidizer chemical chain reaction thermal energy combustibles
PART III: REVIEW FOR THE WRITTEN EXAMINATION
11 The re tetrahedron expands upon the one-dimensional re triangle by adding a fourth element known as (A) (B) (C) (D) oxygen chemical chain reaction heat fuel
12 Which of the following is not a source of heat energy (A) (B) (C) (D) Oxidation reaction Friction Fission of the atom Ignition temperature
13 Combustible matter commonly encountered by re ghters can be found in three states Which of the following is not considered to be one of the three states of matter faced by re ghters on a daily basis (A) (B) (C) (D) Plasma Liquid Gas Solid
14 Solids are materials with de ned volume, size, and shape Which of the following is an accurate example of a solid material (A) (B) (C) (D) Kerosene Methane Cardboard Vinyl chloride
15 Which of the following is not considered to be a factor affecting the ignition and combustibility of wood and wood products (A) (B) (C) (D) Thermal inertia Moisture content Physical form Type of weave
16 Wood having a low thermal inertia demonstrates what type of burning characteristic (A) (B) (C) (D) It heats up and ignites readily It heats up slowly It is very dif cult to ignite None of the above
CHAP 8: FIRE SCIENCE BASICS
17 Which of the following statements about a wood product having a large mass in relation to surface area compared to a similar wood product having less mass in relation to surface area is accurate (A) It will be less dif cult to ignite the object with large mass (B) More heat energy will be required to ignite the object with large mass (C) Once the object with large mass is ignited, the rate of burning will be faster (D) All the statements above are accurate 18 Wet wood is more dif cult to ignite than dry wood Wood will be very dif cult to ignite when the moisture content rises above (A) (B) (C) (D) 8% 12% 15% moisture content has no effect on combustibility
19 The minimum temperature a material must be heated to for it to ignite and be self-sustaining without an external heat source is commonly referred to as a material s (A) (B) (C) (D) ignition temperature piloted-ignition temperature ash point speci c gravity
20 Wood and wood products are classi ed as what type of fuel (A) (B) (C) (D) Class A Class B Class C Class D
21 Plastics are common combustible solids encountered by re ghters Which of the following is an accurate description concerning plastics and plastic materials (A) (B) (C) (D) All plastics are petroleum based All plastics are electrically conductive Pyrolysis occurs less readily in plastics than in wood Plastics are considered Class B materials
22 Plastics can be divided into two categories: thermoplastics and thermosets Which of the following statements concerning plastics is accurate (A) When subjected to the heat from a re, thermoplastics decompose (B) Epoxies and alkyds are examples of thermoplastics (C) When subjected to the heat from a re, thermosets melt and ow (D) Both thermoplastics and thermosets are formed by heat
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