IFSTA Chapter 4 Fire Dynamics ACTUAL
UPDATED Exam Questions and CORECT
Answers
The flow path of a structure fire is comprised of two regions: the ambient air flow in and the: -
CORRECT ANSWER - hot exhaust flow out.
Sawdust ignites more easily than a log because the sawdust has a higher: - CORRECT
ANSWER - Surface-to-mass ratio
Which statement about energy and combustion is accurate? - CORRECT ANSWER - A fuel's
potential energy releases during combustion and converts to kinetic energy.
When a substance changes from one type of matter into another,such as two or more substances
combining to form compounds, the substance undergoes a: - CORRECT ANSWER -
chemical reaction
Which statement about the dangers of products of combustion is accurate? - CORRECT
ANSWER - Low oxygen concentrations alone can result in hypoxia or death.
What is the primary consideration affecting how easily solid fuels ignite? - CORRECT
ANSWER - Surface-to-mass ratio
What will establish new flow paths between the fire compartment and exterior vents of the
building? - CORRECT ANSWER - Firefighters advancing a hoseline through an open door or
ventilating windows to make entry into a building
Fire spreading from a wall to a nearby couch due to radiant heat transfer is an example of: -
CORRECT ANSWER - heat reflectivity.
, What will a liquid with a specific gravity of less than one do when combined with water? -
CORRECT ANSWER - float
What may occur in an oxidation reaction when the heat generated exceeds the heat being lost? -
CORRECT ANSWER - Spontaneous ignition
Which action will transition a compartment fire in a modern structure from ventilation-limited to
fuel-limited - CORRECT ANSWER - Extinguishing some of the fuel
Which type of electrical heating occurs when the current flowing through a conductor exceeds its
design limits? - CORRECT ANSWER - Overcurrent or overload
Which statement about ventilation and wind considerations is MOST accurate? - CORRECT
ANSWER - Wind can increase the pressure inside the structure, driving smoke and flames
into unburned portions of the structure and onto advancing firefighters.
Which is a measure of heat energy transfer rate? - CORRECT ANSWER - Heat flux
What provides the best indicators of structural integrity? - CORRECT ANSWER -
Information gathered at the scene
In the fire environment, convection usually involves the transfer of heat through: - CORRECT
ANSWER - the movement of hot smoke and fire gases.
What is the likely result if additional air is allowed into an already? ventilated compartment fire?
- CORRECT ANSWER - Higher peak heat release rate
The minimum temperature at which a liquid gives off sufficient vapors to ignite, but not sustain
combustion, is its: - CORRECT ANSWER - Flash point
UPDATED Exam Questions and CORECT
Answers
The flow path of a structure fire is comprised of two regions: the ambient air flow in and the: -
CORRECT ANSWER - hot exhaust flow out.
Sawdust ignites more easily than a log because the sawdust has a higher: - CORRECT
ANSWER - Surface-to-mass ratio
Which statement about energy and combustion is accurate? - CORRECT ANSWER - A fuel's
potential energy releases during combustion and converts to kinetic energy.
When a substance changes from one type of matter into another,such as two or more substances
combining to form compounds, the substance undergoes a: - CORRECT ANSWER -
chemical reaction
Which statement about the dangers of products of combustion is accurate? - CORRECT
ANSWER - Low oxygen concentrations alone can result in hypoxia or death.
What is the primary consideration affecting how easily solid fuels ignite? - CORRECT
ANSWER - Surface-to-mass ratio
What will establish new flow paths between the fire compartment and exterior vents of the
building? - CORRECT ANSWER - Firefighters advancing a hoseline through an open door or
ventilating windows to make entry into a building
Fire spreading from a wall to a nearby couch due to radiant heat transfer is an example of: -
CORRECT ANSWER - heat reflectivity.
, What will a liquid with a specific gravity of less than one do when combined with water? -
CORRECT ANSWER - float
What may occur in an oxidation reaction when the heat generated exceeds the heat being lost? -
CORRECT ANSWER - Spontaneous ignition
Which action will transition a compartment fire in a modern structure from ventilation-limited to
fuel-limited - CORRECT ANSWER - Extinguishing some of the fuel
Which type of electrical heating occurs when the current flowing through a conductor exceeds its
design limits? - CORRECT ANSWER - Overcurrent or overload
Which statement about ventilation and wind considerations is MOST accurate? - CORRECT
ANSWER - Wind can increase the pressure inside the structure, driving smoke and flames
into unburned portions of the structure and onto advancing firefighters.
Which is a measure of heat energy transfer rate? - CORRECT ANSWER - Heat flux
What provides the best indicators of structural integrity? - CORRECT ANSWER -
Information gathered at the scene
In the fire environment, convection usually involves the transfer of heat through: - CORRECT
ANSWER - the movement of hot smoke and fire gases.
What is the likely result if additional air is allowed into an already? ventilated compartment fire?
- CORRECT ANSWER - Higher peak heat release rate
The minimum temperature at which a liquid gives off sufficient vapors to ignite, but not sustain
combustion, is its: - CORRECT ANSWER - Flash point
