Chapter 3-Fire Science

How many natural elements are there? A-78 B-92 C-89 D-101

92

A fire can be extinguished by eliminating: A-the fuel. B-the oxidizing agent. C-the heat. D-All of these are correct.

All of these are correct.

Which of the following materials will not spontaneously ignite when exposed to air? A-Charcoal B-Sodium C-White phosphorus D-Potassium

Charcoal

What is the fourth component of the fire tetrahedron? A-Combustion B-Ignition C-Chemical chain reaction D-Vaporization

Chemical chain reaction

A fire whose size is controlled by how much fuel is burning is referred to as a: A-compartment-controlled fire. B-ventilation-controlled fire. C-fuel-controlled fire. D-heat-controlled fire.

FUEL-controlled fire.

Which of the following is not considered remote ignition of a fuel package? A-Convection B-Flame contact C-Radiation D-Conduction

Flame contact

The "peaked" temperature is measured during which phase of fire development? A-Smoldering/decay B-Incipient C-Free-burning D-Flashover

Flashover

Which of the following statements is true? A-Most fires require an oxidizing agent to support combustion. B-The color of smoke is a good indicator of what is burning. C-Most fuels are consumed by premixed burning. D-Plastics are a good conductor for heat transfer

Most fires require an oxidizing agent to support combustion.

Which of the following is not a factor in the ignition of a fuel? A-Form of the fuel B-Quality of oxygen present C-Proximity of the fuel to the heat source D-Duration of exposure

Quality of oxygen present

Which of the following is not a method of heat transfer? A-Conduction B-Radiation C-Refraction D-Convection

Refraction

Which of the following statements is true about witness statements? A-They are highly reliable. B-Witness statements tend to be very accurate in giving the time of ignition. C-They should be treated with caution. D-Witness statements are not part of a scientific fire investigation.

They should be treated with caution.

The stoichiometric ratio is the concentration that exists: A-above the LEL and below the UEL. B-below the LEL and above the UEL. C-above the LEL and above the UEL. D-below the LEL and below the UEL.

above the LEL and below the UEL.

The most important compounds to a fire investigator are: A-iron-based. B-pyrogenic. C-carbon-based. D-inorganic.

carbon-based.

The absorption of heat from heated gases or liquids is called: A-convection. B-radiation. C-fuel-controlled burning. D-conduction.

convection.

The lowest temperature at which a liquid produces a flammable vapor is known as the: A-fire point. B-thermal point. C-flash point. D-flame point.

flash point.

A compartment fire that has reached full room involvement is also known as: A-flashover. B-backdraft. C-overburn. D-complete burn.

flashover.

Any article that is capable of burning is known as a: A-fuel package. B-fuel load. C-fuel item. D-flashover.

fuel item

A form of energy measured in joules is: A-vaporization. B-heat. C-fuel. D-electricity.

heat.

As a plume entrains air into itself, the diameter of the plume will: A-decrease. B-increase. C-not change. D-flatten out.

increase.

The rate at which heat is released is known as the heat release rate (HRR) and is measured in: A-calories per second. B-calories per minute. C-joules per minute. D-joules per second.

joules per second.

The neutral plane in a compartment fire refers to the: A-surface area above the fuel where fire is seen. B-line where the flow of the hot gas and cooler air changes. C-space at floor level that is not involved in the burning process. D-transition point between rollover and flashover.

line where the flow of the hot gas and cooler air changes.

When discussing flame heights to regions of the fire, the continuously flaming region refers to the: A-lower visible flame. B-upper visible flame. C-area above the visible flame. D-stoichiometric area of the flame.

lower visible flame

The column of hot gases, flames, and smoke rising above a fire is called a: A-ceiling jet. B-plume. C-stoichiometric ratio. D-fuel load.

plume.

The process in which something is heated, causing the material to decay and produce fire gases, is known as: A-pyrolysis. B-fire dynamics. C-convection. D-air entrainment.

pyrolysis.

Once a fire reaches full room involvement, ___________ becomes the dominant means of heat transfer. A-convection B-conduction C-radiation D-thermal inertia

radiation

The transmission of heat by electromagnetic waves is called: A-convection. B-conduction. C-radiation. D-combustion.

radiation.

An irreversible phase change to a solid or liquid is called: A-melting. B-dripping. C-vaporization. D-thermal decomposition.

thermal decomposition.

All of the following are factors that influence flashover except: A-compartment size. B-layout of room contents. C-type of fuel in the compartment. D-type and spacing of sprinkler heads in the compartment.

type and spacing of sprinkler heads in the compartment.

The process of heating liquids to produce ignitible mixtures in the air is known as: A-pyrolysis. B-oxidation. C-vaporization. D-combustion.

vaporization.

The process of producing ignitable vapors from a liquid is called: A-fuel load. B-heat. C-the flash point. D-vaporization.

vaporization.