What state must a fuel be in for combustion to take place?
C. Vapor only
As electricity flows through a wire, what relationship, if any, is there between the resistance in
the wire and any heat produced by the current?
produced.
D. The greater the resistance, the less heat is
produced.
C. The greater the resistance, the more heat is produced.
What is the term for the lowest temperature at which a liquid produces a flammable vapor?
D. Flash point
What is the vapor
density of air?
A. 1.0
How are flammability limits and explosive limits related?
A. Flammability limits are used to calculate
explosive limits.
B. Explosive limits are used to calculate
flammability limits.
C. The two terms are neither mathematically nor
conceptually related.
D. They are interchangeable terms meaning the
same thing.
D. They are interchangeable terms meaning thesame thing.
What is the method of choice for extinguishing most Class B fires?
chemical chain reaction
D. Polymerizing the fuel
A. Excluding the oxygen
What is another term for fire point?
B. Flame point
As a solid fuel heats up, it decomposes and releases individual molecules into the atmosphere. What is this process called?
B. Pyrolysis
What is the term for a chemical reaction that produces heat?
C. Exothermic
Down to what temperature, can gasoline still give off flammable vapors?
B. -45o F
At this temperature, a fuel-air mixture will ignite spontaneously.
C. The ignition temperature
What is an endothermic reaction?
B. One that absorbs heat
What creates mechanical energy?
D. Friction
Which process occurs when oxygen combines chemically with another substance to create a new
compound?
A. Oxidation
What is the term for a rapid chemical process in which the combination of a substance with oxygen
produces heat and light?
B. Combustion
What is the term for the decomposition of a material brought about by heat in the absence of oxygen?
C. Pyrolysis
What is the term for the lowest temperature at which a liquid produces enough vapor to sustain a continuous fire?
A. Flame point
What term refers to the weight of a gas compared to air?
A. Vapor density
What is the term for high-volume, high-velocity, turbulent, ultra-dense black smoke?
C. Black fire
When you open a door and the smoke exits through the top half of the door and clean air enters
through the bottom half, the fire is probably on what level?
C. Same level as the door
You open a door and the smoke rises and the opening clears out; fresh air is being pulled into the
building. The fire is probably on what level?
B. Above the level of the door
When you open a door and the smoke thins, but the smoke still fills the door, the fire is probably on what level?
