Chapter 5

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Matter exists in _____ states. A) 3 B) 4 C) 5 D) 6

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1

Matter exists in _____ states. A) 3 B) 4 C) 5 D) 6

A) 3

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2

Which is one of the three factors in solid fuel configuration? A) Surface-to-mass ratio B) Chemical composition C) Moisture content D) Heat release rate

A) Surface-to-mass ratio

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3

What is the term for temperature in a room reaching the point where all exposed surfaces in room ignite? A) Autoignition B) Flashover C) Backdraft D) Rollover

B) Flashover

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4

Heat rising within a structure is primarily caused by which form of heat transfer? A) Circulation B) Radiation C) Conduction D) Convection

D) Convection

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5

What is the term for the spontaneous ignition of hot gases at the upper level of a room? A) Ghosting B) Flashover C) Rollover D) Mushrooming

C) Rollover

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6

The majority of fires are extinguished by which method? A) Cooling the fuel B) Excluding oxygen C) Suppressing vapor emission D) Inhibiting the chemical chain reaction

A) Cooling the fuel

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7

Which material has the highest thermal conductivity? A) Concrete B) Wood C) Copper D) Air

C) Copper

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8

Flashover is a rapid transition into the ___________ stage of fire development. A) growth B) decay C) fully developed D) incipient

C) fully developed

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9

Fires involving combustible cooking oils and fats are Class: A) K. B) B. C) G. D) D.

A) K.

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10

The majority of civilian fire injuries occur in which type of occupancy? A) Retail/office B) Industrial/manufacturing C) Educational/institutional D) Residential

D) Residential

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11

What is the second stage of fire development? A) Growth B) Rollover C) Fully developed D) Incipient

A) Growth

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12

Which situation is indicated when you open a door and the smoke thins, but the smoke still fills the door? A) The fire has reached thermal equilibrium. B) The fire has ventilated through another opening. C) There is a slow-moving, low-intensity fire. D) The fire is below the level of the door.

D) The fire is below the level of the door.

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13

The lowest temperature at which a liquid or solid produces enough flammable vapor to burn briefly is its: A) fire point. B) ignition temperature. C) flammable range. D) flash point.

D) flash point.

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14

What is the area within a structure where heat, smoke, and air move from areas of higher pressure to lower pressure? A) Flow path B) Thermal gradient C) Neutral plane D) Interior draft

A) Flow path

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15

The volume of space in which the movement of cooler air enters through an inlet vent and the space where hot gases and smoke exit through an exhaust outlet is the: A) ventilation track. B) flow path. C) thermal gradient. D) convective flow.

B) flow path.

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16

Which term is used interchangeably with flammability range? A) Explosive limit B) Volatility index C) Oxidation range D) Pyrophoric limit

A) Explosive limit

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17

What is the smallest unit of matter? A) A molecule B) A particle C) An element D) An atom

D) An atom

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18

Heat transfer in the form of invisible electromagnetic waves is called: A) conduction. B) radiation. C) convection. D) emission.

B) radiation.

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19

Which geometric figure is used to represent the four elements required for a self-sustaining fire? A) Pyramid B) Square C) Polygon D) Tetrahedron

D) Tetrahedron

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20

Which situation is indicated if you open a door and the smoke rises and the opening clears out? A) The fire is ventilation controlled. B) The fire is in the decay stage. C) The fire is extinguished. D) The fire is above the level of the door.

D) The fire is above the level of the door.

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21

Which is the flash point of gasoline? A) -45ºF (-43ºC). B) -15ºF (-26ºC). C) 0ºF (-18ºC). D) 32ºF (0ºC).

A) -45ºF (-43ºC).

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22

Which term refers to the weight of a gas compared to air? A) Specific density B) Specific gravity C) Vapor gravity D) Vapor density

D) Vapor density

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23

Which class of fire involves ordinary solid combustibles such as wood and paper? A) A B) B C) C D) D

A) A

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24

What is the percentage of oxygen normally found in air? A) 15.5 B) 18 C) 19.5 D) 21

D) 21

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25

A Class C fire involves: A) a flammable liquid or gas. B) energized electrical equipment. C) cooking material. D) a combustible metal.

B) energized electrical equipment.

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26

What is the lowest temperature at which a fuel-air mixture will ignite in the presence of air and continue to burn? A) Fire point B) Ignition temperature C) Flash point D) Specific heat

B) Ignition temperature

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27

Movement of hot fluid is an example of which method of heat transfer? A) Circulation B) Radiation C) Conduction D) Convection

D) Convection

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28

A gas with a vapor density of _____ will rise in air. A) 0.1 B) 1.0 C) 10 D) 100

A) 0.1

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29

An endothermic reaction is one that: A) requires a catalyst. B) absorbs heat. C) occurs in the absence of oxygen. D) releases energy.

B) absorbs heat.

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30

What is the vapor density of air? A) 0.0 B) 1.0 C) 14.7 D) 29.9

B) 1.0

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31

What is the relationship between resistance and heat as electricity flows through a wire? A) There is no relationship between the two. B) As resistance increases, heat increases. C) As resistance decreases, heat increases. D) As resistance increases, heat decreases.

B) As resistance increases, heat increases.

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32

The neutral plane is most directly associated with: A) heat flux. B) thermal layering. C) flow path. D) fuel continuity.

B) thermal layering.

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33

Which situation is indicated when you open a door and the smoke exits through the top half of the door and clean air enters through the bottom half? A) Imminent rollover. B) An under-ventilated fire. C) The fire is on the same level as the door. D) Nonsurvivable conditions for occupants.

C) The fire is on the same level as the door.

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34

Which is a commonly used method of extinguishing Class B fires? A) Excluding the oxygen B) Cooling the fuel C) Interrupting the chemical chain reaction D) Dispersing the vapors

A) Excluding the oxygen

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35

What does smoke puffing in and out of a structure indicate? A) Impending structural collapse B) Backdraft conditions C) Growth-stage fire D) Imminent flashover

B) Backdraft conditions

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36

Heat traveling from one end of a steel beam to the other end is an example of: A) convection. B) radiation. C) oxidation. D) conduction.

D) conduction.

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37

What is the process of heating a solid fuel so that it liberates gaseous fuel vapors? A) Vaporization B) Pyrolysis C) Oxidation D) Electrolysis

B) Pyrolysis

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38

In which process is a new compound created from the combination of oxygen and another substance? A) Catagenesis B) Pyrolysis C) Combustion D) Oxidation

D) Oxidation

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39

Which toxic gas is commonly produced by fire? A) Hydrogen sulfide B) Nitrogen sulfide C) Hydrogen cyanide D) Acrolein

C) Hydrogen cyanide

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40

Which is a common indicator of backdraft conditions? A) Smoke that appears to be pressurized B) Vigorous flame productions C) Windows broken out D) Good interior visibility

A) Smoke that appears to be pressurized

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41

What is another term for fire point? A) Ignition point B) Flame point C) Flash point D) Autoignition temperature

B) Flame point

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42

The movement of heated gases in a fire is an example of which form of heat transfer? A) Circulation B) Radiation C) Conduction D) Convection

D) Convection

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43

The sudden introduction of air into an oxygen-depleted, superheated space may result in: A) improved visibility. B) ghosting. C) backdraft. D) black fire.

C) backdraft.

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44

Friction is a form of __________ energy. A) radiant B) molecular C) mechanical D) kinetic

C) mechanical

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45

Smoke produced by some solid materials when they are first heated is typically which color? A) Mustard yellow B) White C) Brown D) Gray

B) White

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46

Which is a component of a BLEVE? A) A pressurized flammable liquid vessel B) A "closed box" structure C) A flammable gas leak D) Contact with an energized electrical circuit

A) A pressurized flammable liquid vessel

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47

A chemical reaction that produces heat is: A) exothermic. B) thermodynamic. C) isothermic. D) endothermic.

A) exothermic.

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48

Which form of energy causes spontaneous heating of a pile of linseed oil-soaked rags? A) Organic B) Hypergolic C) Exothermic D) Chemical

D) Chemical

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49

In solid materials, energy moves directly from one molecule to another in which form of heat transfer? A) Induction B) Reduction C) Conduction D) Convection

C) Conduction

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50

The rapid chemical process in which the combination of a substance with oxygen produces heat and light is: A) combustion. B) catalyzation. C) vaporization. D) pyrolysis.

A) combustion.

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51

The measure of the rate of transfer of heat from one surface to another is: A) heat flux. B) transfer gradient. C) thermal conductivity. D) heat release rate.

A) heat flux.

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52

Turbulent smoke is an indication of impending: A) flashover. B) mushrooming. C) self-ventilation. D) stratification.

A) flashover.

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53

Which hazard is of particular concern when attacking a Class C fire? A) Electrical injury B) Flashover C) Permeation of PPE D) Backdraft

A) Electrical injury

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54

Which stage of fire results from decreasing oxygen and/or fuel supply? A) Isothermic B) Equilibrium C) Incipient D) Decay

D) Decay

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55

Flammable liquid fires are Class: A) A. B) B. C) C. D) D.

B) B.

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56

Which form of heat transfer travels in all directions? A) Convection B) Thermal radiation C) Conduction D) Direct contact

B) Thermal radiation

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57

What is the lowest temperature at which a liquid produces enough vapor to sustain a continuous fire? A) Vaporization temperature B) Flash point C) Fire point D) Ignition temperature

C) Fire point

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58

Which effect on fire development is a result of modern construction techniques and materials? A) Tendency for multiple flow paths B) Disrupted thermal layering C) Greater frequency of ventilation-limited fires D) Prolonged growth stage

C) Greater frequency of ventilation-limited fires

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59

Which state must a fuel be in for combustion to take place? A) Solid B) Liquid C) Vapor D) Solid, liquid, or vapor

C) Vapor

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60

Which is a component of the fire triangle? A) Catalyst B) Heat C) Chemical chain reaction D) Ignition source

B) Heat

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