DC 308 QUESTIONS WITH VERIFIED ANSWERS
What is the 4th requirement needed for flames to exist in a fire? - Answers - An
uninhibited chemical chain reaction
What works to interrupt the chemical chain reaction? - Answers - Halon and dry
chemical extinguishing agents
Class A fires - Answers - Wood and wood products, cloth, textiles and fibrous materials,
paper and paper products
What extinguishes class A fires? - Answers - Water in a straight or fog pattern
What extinguishes a class A fire if it is deep seated? - Answers - AFFF, and can be
used as a penetrating agent to extinguish the fire
What helps to identify a class A fire? - Answers - White smoke with ashes
Class B fires - Answers - Flammable and combustible liquids (gas, diesel fuels, jet fuels,
hydraulic fluids and lube oil)
can also involve flammable gasses (acetylene which should not be extinguished unless
the flow of gas can be secured)
What is used to extinguish class B fires? - Answers - Normally extinguished with AFFF
What is the single most important step in extinguishing a class B fire? - Answers -
Securing the fuel source
What characterizes a class B fire? - Answers - Black smoke, white smoke, door cool to
touch
What discharged will indicate that a class B fire is our? - Answers - Halon or AFFF in a
space
Class C fires - Answers - Energized electrical fires that should be attacked at prescribed
distances
What Is the most effective tactic to de-energize and handle a class C fire? - Answers -
Class A fire
What is an extinguishing agent for class fires? - Answers - CO2 and water fog at
prescribed distances
, What should you do if a class C fire is not deep seated? - Answers - Clean objects that
pose no clean up problem (CO2)
How is water fog applied to a class C fire? - Answers - In a narrow 'V' pattern and the
nozzleman should be a distance of 4-6ft from fire
What characterizes a class C fire? - Answers - White smoke with a blue flame
Class D fires - Answers - Combustible metals such as magnesium and titanium
What is the extinguishing agents for a class D fire? - Answers - Water in quantity using
a fog pattern
What are risks involved with applying water to class D fires? - Answers - Small
explosions so the firefighter should stand safe distances away from fire or stand behind
a shelter
What are normally associated with class D fires? - Answers - Metal fires and aircraft
wheel structures
What should the hose team do prior to accessing a space that is filled with smoke? -
Answers - Go 'on air'
What should the hose team do before accessing a space with individually dogged
doors? - Answers - Start with the hinged side first
What should the hose team do before accessing a space with ATD? - Answers - Start
with the top dog, the bottom, and then the middle
When accessing a space, who from the hose team should be placed at the entry side of
door? - Answers - Nozzleman
What should the hose team do to prevent becoming overheated from smoke and
increase visibility? - Answers - Stay low
Who should stay informed of the status of the fire at all times? - Answers - On scene
leader (fire out, class of fire, fire engaged)
Who from the hose team is responsible for keeping their eyes on the fire at all times? -
Answers - Nozzleman
What type of vari-nozzle does the ship use? - Answers - 95gpm on firestations in the
skin of the ship
How many patterns does the vari-nozzle use? - Answers - 4
What is the 4th requirement needed for flames to exist in a fire? - Answers - An
uninhibited chemical chain reaction
What works to interrupt the chemical chain reaction? - Answers - Halon and dry
chemical extinguishing agents
Class A fires - Answers - Wood and wood products, cloth, textiles and fibrous materials,
paper and paper products
What extinguishes class A fires? - Answers - Water in a straight or fog pattern
What extinguishes a class A fire if it is deep seated? - Answers - AFFF, and can be
used as a penetrating agent to extinguish the fire
What helps to identify a class A fire? - Answers - White smoke with ashes
Class B fires - Answers - Flammable and combustible liquids (gas, diesel fuels, jet fuels,
hydraulic fluids and lube oil)
can also involve flammable gasses (acetylene which should not be extinguished unless
the flow of gas can be secured)
What is used to extinguish class B fires? - Answers - Normally extinguished with AFFF
What is the single most important step in extinguishing a class B fire? - Answers -
Securing the fuel source
What characterizes a class B fire? - Answers - Black smoke, white smoke, door cool to
touch
What discharged will indicate that a class B fire is our? - Answers - Halon or AFFF in a
space
Class C fires - Answers - Energized electrical fires that should be attacked at prescribed
distances
What Is the most effective tactic to de-energize and handle a class C fire? - Answers -
Class A fire
What is an extinguishing agent for class fires? - Answers - CO2 and water fog at
prescribed distances
, What should you do if a class C fire is not deep seated? - Answers - Clean objects that
pose no clean up problem (CO2)
How is water fog applied to a class C fire? - Answers - In a narrow 'V' pattern and the
nozzleman should be a distance of 4-6ft from fire
What characterizes a class C fire? - Answers - White smoke with a blue flame
Class D fires - Answers - Combustible metals such as magnesium and titanium
What is the extinguishing agents for a class D fire? - Answers - Water in quantity using
a fog pattern
What are risks involved with applying water to class D fires? - Answers - Small
explosions so the firefighter should stand safe distances away from fire or stand behind
a shelter
What are normally associated with class D fires? - Answers - Metal fires and aircraft
wheel structures
What should the hose team do prior to accessing a space that is filled with smoke? -
Answers - Go 'on air'
What should the hose team do before accessing a space with individually dogged
doors? - Answers - Start with the hinged side first
What should the hose team do before accessing a space with ATD? - Answers - Start
with the top dog, the bottom, and then the middle
When accessing a space, who from the hose team should be placed at the entry side of
door? - Answers - Nozzleman
What should the hose team do to prevent becoming overheated from smoke and
increase visibility? - Answers - Stay low
Who should stay informed of the status of the fire at all times? - Answers - On scene
leader (fire out, class of fire, fire engaged)
Who from the hose team is responsible for keeping their eyes on the fire at all times? -
Answers - Nozzleman
What type of vari-nozzle does the ship use? - Answers - 95gpm on firestations in the
skin of the ship
How many patterns does the vari-nozzle use? - Answers - 4
