Fire Dynamics
The transfer of heat through and between solids is known as:
a. radiation.
b. convection.
C. conduction.
d. self-heating.
C. conduction.
What is the likely result if additional air is allowed into an already-ventilated compartment fire?
a. Lower neutral plane
b. Higher peak heat release rate
C. Reduced vapor pressure at the seat of the fire
d. Higher ratio of complete to incomplete combustion
b. Higher peak heat release rate
Why should firefighters exit the IDLH before their low-pressure alarm activates?
a.
The remaining air is insufficient to exit even if no emergencies occur.
b. Hearing the alarm may cause panic, which will speed up air consumption.
C. The remaining air is an average, not specific to each firefighter, so it may be insufficient to exit from both short and long distances.
D. The remaining air is insufficient to exit from deep inside a large structure and does not take into account emergencies that may be encountered.
D. The remaining air is insufficient to exit from deep inside a large structure and does not take into account emergencies that may be encountered.
Where should you start the search on the fire floor?
a. At the entrance
b. As close to the fire as possible
C. Where victims are most likely to be
d. Where victims will be easiest to rescue
b. As close to the fire as possible
Before entering the building or fire area, the firefighter who is assigned to the nozzle of the attack hose should:
a. open the nozzle fully to check for adequate flow.
b. wait to call for water until the entry door is propped open.
C. open the nozzle hallway once he or she reaches the fire compartment.
D. wait to call for water until they are several steps inside the structure.
a. open the nozzle fully to check for adequate flow.
In the fire environment, convection usually involves the transfer of heat through:
a. electromagnetic energy waves.
b. direct contact with a heat source.
C. intermittent contact with a heat source.
d. the movement of hot smoke and fire gases.
d. the movement of hot smoke and fire gases.
What will a liquid with a specific gravity of less than one do when combined with water?
a. Sink
b. Float
C. Vaporize
d. Easily mix
b. Float
Which of the following is one of the three principles of air management?
a. Know your point of no return.
b. Always use short, quick breaths.
C. Leave the structure when your cylinder reaches 50% capacity.
d. Turn your SCBA off once you have found an area of safe haven.
a. Know your point of no return.
If there is heavy smoke or extreme heat in a compartment that is being searched, rescuers should:
a. stand to get a better view.
b. move below the smoke level.
C. attempt to extinguish the fire.
d. check the heat signature with a thermal imager.
b. move below the smoke level.
If a firefighter uses a Z pattern to apply water to the hot gas layer and then the burning fuels at the floor level, he or she is using a(an) fire attack.
a. direct
b. indirect
C. transitional
d. combination
d. combination
By which mechanism of heat transfer does heat travel in a straight line at the speed of light, allowing heat to travel through vacuums and air spaces?
a. Radiation
b. Reflection
C. Convection
d. Conduction
a. Radiation
The minimum temperature at which a liquid gives off sufficient vapors to ignite, but not sustain combustion,
is its:
a. flash point.
b. vapor pressure.
C. specific gravity.
d. degree of solubility.
a. flash point
What is a general safety precaution to take when refilling an SCBA cylinder?
a. Wear full structural fire fighting PPE.
b. Fill the cylinder as quickly as possible.
C. Perform a hydrostatic test on the cylinder.
d. Check the hydrostatic test date of the cylinder.
d. Check the hydrostatic test date of the cylinder.
Which type of carry or drag is commonly used for children, but is not practical for unconscious adults?
a. Incline drag
b. Webbing drag
C. Extremities lift/carry
d. Cradle-in-arms lift/carry
d. Cradle-in-arms lift/carry
Which type of fire attack involves applying water from the outside of the structure in order to reduce the potential for flashover and make the environment more survivable for an interior attack crew?
a. Direct attack
b. Indirect attack
C. Transitional attack
d. Combination attack
C. Transitional attack
What occurs when a gas is compressed?
a. Heat is absorbed
b. Heat is generated
C. Gas becomes more buoyant
d. Gas becomes less conductive
b. Heat is generated
When solid fuels are heated, they begin to and release fuel gases and vapors.
a. melt
b. pyrolize
c. hypoxilize
d. evaporate
b. pyrolize
If the pressure reading on the remote pressure gauge does not match the reading on the regulator gauge, which reading should be assumed correct?
a. The lowest number reading
b. The highest number reading
C. Neither of the pressure readings
D. An average of the pressure readings
a. The lowest number reading
Which of the following actions should be taken immediately when MAYDAY is broadcast?
a. The MAYDAY crew is dispatched to locate the downed firefighter.
b. All radio traffic ceases and only traffic relating to the MAYDAY is allowed.
C. Personnel near the downed firefighter should proceed to assist with rescue.
d. All assigned units are directed to assist with searching for the firefighter who has broadcast the MAYDAY.
b. All radio traffic ceases and only traffic relating to the MAYDAY is allowed
Which statement describes a safety guideline for operations at a multistory building?
a. Firefighters must not use an elevator to get to the fire floor.
b. Firefighters must not connect the hose to the standpipe on the fire floor.
C. If the standpipe is in a protected stairwell, the hose must be connected on the floor above the fire.
d. If the structure does not have a standpipe, firefighters must avoid using the stairwell nearest to the fire.
Firefighters must not use an elevator to get to the fire floor.
What may occur in an oxidation reaction when the heat generated exceeds the heat being lost?
a. Piloted ignition
b. Arcing/sparking
C. Backdraft/flashover
d. Spontaneous ignition
d. Spontaneous ignition
Observed from the exterior, a high neutral plane may indicate that the fire is in the early stages of development, or could indicate:
a. a fire in decay stage.
b. a fire above your level.
C. that the fire is reaching backdraft conditions.
d. that the compartment has not yet ventilated.
b. a fire above your level.
Which SCBA component controls air flow from the cylinder when the regulator fails?
a. Diaphragm
b. Bypass valve
C. Mainline valve
D. Pressure gauge
b. Bypass valve
What should you do if you become entangled while trying to evacuate a building?
A. Remove your SCBA and cut the wires
b. Contact the rapid intervention crew by radio
C. Wait calmly for another firefighter to find you
d. Broadcast a MAYDAY, then attempt to free yourself
d. Broadcast a MAYDAY, then attempt to free yourself
Which inspection hole is made by making a single cut in the roof surface using a rotary saw, chain saw, or axe?
a. Box cut
b. Kerf cut
C. Angle cut
d. Triangle cut
b. Kerf cut