Firefighter 1 Chapter 4 test Fire Dynamics UPDATED ACTUAL and Correct Answers

Firefighter 1 Chapter 4 test Fire Dynamics UPDATED ACTUAL
and Correct Answers
Question: Fires involve a heat producing chemical reaction between fuel and:
Answer:
an oxidizer

Question: 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:
Answer:
Chemical reaction

Question: Which statement about energy and combustion is accurate?
Answer:
A fuels potential
energy releases during combustion and converts to kinetic energy

Question: Which element of the fire tetrahedron is included to explain flaming (gas
phase) combustion?
Answer:
Chemical chain reaction

Question: 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?
Answer:
piloted ignition

Question: the minimum temperature at which a fuel in the air must be heated in order
to start self-sustained combustion is known as the
Answer:
autoignition temperature (AIT)

Question: What causes flaming combustion to occur?
Answer:
A gaseous fuel mixes with an adequate amount
of oxygen and heats to ignition temperature

, Question: What is the cause of most fire deaths?
Answer:
exposure to toxic gases found in smoke and/or lack of
oxygen

Question: Which statement about the dangers of products of combustion is accurate?-
Answer:
Low oxygen concentrations alone can result in hypoxia or death

Question: Which product of combustion acts as a chemical asphyxiant by excluding
oxygen from the blood, leading to hypoxia of the brain and tissues?
Answer:
Carbon
monoxide (CO)

Question: Hydrogen cyanide (HCN) is a product of combustion that:
Answer:
targets the brain after
being inhaled, ingested, or absorbed into the body

Question: How does a compartment fire affect pressure in and around gases in the
compartment?
Answer:
Heat from a fire increases the pressure of the surrounding gases

Question: What is the measurement of the average kinetic energy in the particles of
a sample matter?
Answer:
Temperature

Question: Which measurement is often used to measure how long PPE will protect a
firefighter in an interior fire environment
Answer:
heat flux to the PPE

Question: What is the most common source of heat in combustion reactions?
Answer: