IFSTA Chapter 4 Fire Dynamics UPDATED
Exam Questions and CORECT Answers
What is often the most readily available fuel source and significantly influences fire development
in a compartment fire?
A. Exterior wall coverings
B. Contents within the structure
C. Window, wall, and floor coverings
D. Combustible roof materials - CORRECT ANSWER - Contents within the structure
What is the most effective means of establishing awareness of hazards in commercial, industrial,
and storage facilities with large fuel loads?
A. Accessing code enforcement databases
B. Studying plat maps and building plans
C. Contacting the facilities manager during the incident
D. Performing and updating preincident surveys - CORRECT ANSWER - Performing and
updating preincident surveys
Which statement about ventilation and wind considerations is MOST accurate?
A. Unplanned ventilation is most likely to occur in structures undergoing construction or
renovation.
B. The source of new oxygen always originates from outside the building.
C. Wind can increase the pressure inside the structure, driving smoke and flames into unburned
portions of the structure and onto advancing firefighters.
D. Unplanned ventilation occurs when an occupant or bystander interferes with coordinated
fireground activities and introduces a new source of oxygen to the fire. - CORRECT
ANSWER - Wind can increase the pressure inside the structure, driving smoke and flames
into unburned portions of the structure and onto advancing firefighters.
,In a compartment fire, smoke flashover indicators include rapidly increasing volume, turbulence,
optical density, and:
A. Fuel load
B. Ventilation
C. Darkening color
D. Thermal properties - CORRECT ANSWER - Darkening color
What provides the best indicators of structural integrity?
A. Information gathered at the scene
B. Year and method of construction
C. Occupancy classification
D. Occupant interview during the preincident survey - CORRECT ANSWER - Information
gathered at the scene
What occurs when a gas is compressed?
A. Heat is generated
B. Heat is absorbed
C. Gas becomes more buoyant
D. Gas becomes less conductive - CORRECT ANSWER - Heat is generated
When solid fuels are heated, they begin to _____ and release fuel gases and vapors.
A. Evaporate
B. Melt
C. Hypoxilize
, D. Pyrolyze - CORRECT ANSWER - Pyrolyze
How does the self-sustained chemical reaction influence the oxidation reaction in flaming
combustion?
A. Increases the ratio of complete to incomplete combustion of fuel
B. Decreases the temperature required for the oxidation reaction
C. Increases the speed of the oxidation reaction
D. Decreases the types of products of combustion released - CORRECT ANSWER -
Increases the speed of the oxidation reaction
What is the MOST common source of heat in combustion reactions?
A. Convective flow
B. Electrical energy
C. Thermal equilibrium
D. Chemical energy - CORRECT ANSWER - Chemical energy
What occurs during flashover?
A. The volume of burning gases can increase to fill the room's entire volume and extend out of
any openings from the room.
B. The heat release rate of the fire will reach its peak.
C. Flames propagate through the hot gas layer or across the ceiling.
D. The compartment will fill with black smoke and slowly cooling fuel gases; the compartment
will show no visible flames. - CORRECT ANSWER - The volume of burning gases can
increase to fill the room's entire volume and extend out of any openings from the room.
In most compartment fires, the energy release in fire is directly proportional to the:
Exam Questions and CORECT Answers
What is often the most readily available fuel source and significantly influences fire development
in a compartment fire?
A. Exterior wall coverings
B. Contents within the structure
C. Window, wall, and floor coverings
D. Combustible roof materials - CORRECT ANSWER - Contents within the structure
What is the most effective means of establishing awareness of hazards in commercial, industrial,
and storage facilities with large fuel loads?
A. Accessing code enforcement databases
B. Studying plat maps and building plans
C. Contacting the facilities manager during the incident
D. Performing and updating preincident surveys - CORRECT ANSWER - Performing and
updating preincident surveys
Which statement about ventilation and wind considerations is MOST accurate?
A. Unplanned ventilation is most likely to occur in structures undergoing construction or
renovation.
B. The source of new oxygen always originates from outside the building.
C. Wind can increase the pressure inside the structure, driving smoke and flames into unburned
portions of the structure and onto advancing firefighters.
D. Unplanned ventilation occurs when an occupant or bystander interferes with coordinated
fireground activities and introduces a new source of oxygen to the fire. - CORRECT
ANSWER - Wind can increase the pressure inside the structure, driving smoke and flames
into unburned portions of the structure and onto advancing firefighters.
,In a compartment fire, smoke flashover indicators include rapidly increasing volume, turbulence,
optical density, and:
A. Fuel load
B. Ventilation
C. Darkening color
D. Thermal properties - CORRECT ANSWER - Darkening color
What provides the best indicators of structural integrity?
A. Information gathered at the scene
B. Year and method of construction
C. Occupancy classification
D. Occupant interview during the preincident survey - CORRECT ANSWER - Information
gathered at the scene
What occurs when a gas is compressed?
A. Heat is generated
B. Heat is absorbed
C. Gas becomes more buoyant
D. Gas becomes less conductive - CORRECT ANSWER - Heat is generated
When solid fuels are heated, they begin to _____ and release fuel gases and vapors.
A. Evaporate
B. Melt
C. Hypoxilize
, D. Pyrolyze - CORRECT ANSWER - Pyrolyze
How does the self-sustained chemical reaction influence the oxidation reaction in flaming
combustion?
A. Increases the ratio of complete to incomplete combustion of fuel
B. Decreases the temperature required for the oxidation reaction
C. Increases the speed of the oxidation reaction
D. Decreases the types of products of combustion released - CORRECT ANSWER -
Increases the speed of the oxidation reaction
What is the MOST common source of heat in combustion reactions?
A. Convective flow
B. Electrical energy
C. Thermal equilibrium
D. Chemical energy - CORRECT ANSWER - Chemical energy
What occurs during flashover?
A. The volume of burning gases can increase to fill the room's entire volume and extend out of
any openings from the room.
B. The heat release rate of the fire will reach its peak.
C. Flames propagate through the hot gas layer or across the ceiling.
D. The compartment will fill with black smoke and slowly cooling fuel gases; the compartment
will show no visible flames. - CORRECT ANSWER - The volume of burning gases can
increase to fill the room's entire volume and extend out of any openings from the room.
In most compartment fires, the energy release in fire is directly proportional to the:
