Firefighter 1 Chapter 4 test Fire Dynamics Fires involve a heat producing chemical reaction between fuel and: - CORRECT ANSWER an oxidizer When a substance changes from one type of matter to another such as two or
more substances combining to form compounds, the substance undergoes a: -
CORRECT ANSWER Chemical reaction Which statement about energy and combustion is accurate? - CORRECT ANSWER A fuels potential energy releases during combustion and converts to kinetic energy Which element of the fire tetrahedron is included to explain flaming (gas phase) combustion? - CORRECT ANSWER Chemical chain reaction 1 / 3
What occurs when a mixture of fuel and oxygen encounter an external heat source with sufficient heat or thermal energy to start the combustion reaction? - CORRECT ANSWER piloted ignition the minimum temperature at which a fuel in the air must be heated in order to start self-sustained combustion is known as the - CORRECT ANSWER autoignition temperature (AIT) What causes flaming combustion to occur? - CORRECT ANSWER A gaseous fuel mixes with an adequate amount of oxygen and heats to ignition temperature What is the cause of most fire deaths? - CORRECT ANSWER exposure to toxic gases found in smoke and/or lack of oxygen Which statement about the dangers of products of combustion is accurate? - CORRECT ANSWER Low oxygen concentrations alone can result in hypoxia or death 2 / 3
Which product of combustion acts as a chemical asphyxiant by excluding oxygen from the blood, leading to hypoxia of the brain and tissues? - CORRECT ANSWER Carbon monoxide (CO)
Hydrogen cyanide (HCN) is a product of combustion that: - CORRECT ANSWER
targets the brain after being inhaled, ingested, or absorbed into the body How does a compartment fire affect pressure in and around gases in the compartment? - CORRECT ANSWER Heat from a fire increases the pressure of the surrounding gases What is the measurement of the average kinetic energy in the particles of a sample matter? - CORRECT ANSWER Temperature
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