Customary System

Pound (lb)

International System of Units

Newtons (N)

Customary System

Foot-pound (ft lb)

International System of Units

???

Customary System

Horsepower (hp)

International System of Units

Watts (W)

Customary System

Fahrenheit (F)

International System of Units

Celsius (C)

Customary System

Calorie (Cal) or British Thermal Unit (Btu)

International System of Units

 ????

Customary System

Btu per second (Btu/s)

International System of Units

Kilowatts (kW)

Customary System

Pound per cubic foot (lb/ft³)

International System of Units

Kilogram per cubic meter (kg/m³)

True or False

Firefighter should attack structural and wildland fires the same way

False

Many of the concepts hold true for wildland fires, but a number of additional factors must be addressed in those incidents

True or False

The scientific community, as well as most nations other than the United States, use the International System of Units

True or False

The English or Customary System logically baseds all measurements on powers of 10

False

SI is a very logical and simple system based on powers of 10

True or False

A vacuum contains no medium for the point-to-point contact needed to conduct heat

True or False

A good insulator sustains point-to-point heat transfer

False

Good insulators are materials that do not conduct heat well because their physical makeup disrupts the

point-to-point transfer of heat energy

True or False

Radiation causes most exposure fires.

True or False

Temperature, alone, determines at what point water will boil.

False

The other factors is pressure. As the pressure on the surface of a substance decreases, so does the temperature at which it boils

True or False

Liquids with a specific gravity less than 1 are lighter than water, while those with a specific gravity greater than 1 are heavier than water

True or False

Researchers can calculate the heat release rate of materials by using instruments that determine mass loss and temperature gain when a fuel is burned

True or False

Oxidation absorbs energy or is endothermic

False

The oxidation reaction releases energy or is exothermic

True or False

The slowness of the chemical reaction between oxygen and iron prevents the generation of heat

False

Because oxidation is an exothermic process, it always produces heat

True or False

The fire triangle more accurately depicts the components of a fire than does the fire tetrahedron

False

While the fire traingle is useful, it is not technically correct. For combustion, four components are necessary

True or False

Only oxygen causes oxidation

False

While oxygen is the most common oxidizer, other substances also fall into this category

True or False

When placed in an oxygen-enriched atmosphere, even some fire-resistant materials like Nomex ignite and burn vigorously

True or False

Normally, fuels must be in a gaseous state to burn

True or False

Teh volatility or ease with which a liquid gives off vapor influences its ignitablily

True or False

When contained, the specific volume of a liquid has a relatively high surface-to-volume ratio

False

When contained, the specific volume of a liquid has a relatively low surface-to-volume ratio

True or False

For standardization, researchers normally expres sany heat of combustion in terms of the heat of gasoline combustion

False

Materials with different heats of combustion are converted to be equivalent to the heat of combustion of wood.

True or False

Chemical heat, like the heat generated when a match burns, is the most common source of heat in combustion reactions

True or False

Ignition describes the period when the three elements of the fire triangle come together and combustion begins

False

Ignition describes the period when the four elements of the fire tetrahedron come together and combustion begins.

True or False

Flashover occurs when temperatures reach 1,200 deg F

False

While no exact temperature is associated with this occurrence, a range from approximately 900 deg F to 1,200 deg F is widely used

True or False

Occupants who have not escaped from a compartment before flashover occurs are not likely to survive

True or False

Personal protective gear safeguards firefighters from the extreme danger of a compartment flashover

False

Firefighters who find themselves in a compartment at flashover are at extreme risk even while wearing their personal protecive equipment

True or False

During decay, the fire becomes fuel controlled, the amount of fire diminishes, and the temperatures within the compartment begin to decline

True or False

Firefighters have no way to determine the fire growth potential for a building or space

False

Firefighters should be able to recognize potential fuel packages in a building or compartment and use this infomation to estimate the fire growth potential

True or False

Flameover involves only the fire gases, not the surfaces, of the other fuel packages within a compartment

True or False

Improper ventilation can allow air to mix with hot gases and cause an explosive ignition called backdraft

True or False

The heat energy from fires causes more deaths than smoke inhalation

False

Smoke causes most deaths in fires

True or False

Smoke contains toxic substances, most commonly CO, that can be deadly to firefighters not wearing SCBA

True or False

Water effectively extinguishes ignitable liquids with a specific gravity of less than 1

False

If water is used, the fuel can float on it while continuing to burn. If the fuel is unconfined, using water could unintentionally spread a fire.

True or False

Polar solvents dissove in water

True or False

Hydrocarbon gases have vapor densities greater than 1, which allow them to rise and dissipate when released

False

Gases or vapors with vapor densities greater than 1 tend to hug the ground and travel as directed by terrain and wind

True or False

Each fire class requires different extinguishing agents

True or False

CO₂ flooding provides adequate cooling for Class A fires

False

CO₂ flooding or coating with foam does not provide the coolin geffect needed for total extinguishment

True or False

Oxygen-exclusion extinguishment methods work best on fires involving flammable and combustible liquids and gases.

True or False

No single agent controls fires in all combustible metals

True or False

Firefighters should immediately begin fighting Class D fires with a blanket of dry chemicals

False

Information regarding a material and its characteristics should be reviewed prior to attempting to extinguish a Class D fire.

As depicted below, what type of heat transfer moves from point to point?

[image]

As depicted below, what type of heat transfer occurs when a fluid or gas flows from one place to another?

[image]

As depicted below, what type of heat transfer occurs without an intervening medium?

[image]