Portable Fire Extinguishers

What is one extinguishing agent that will not conduct electricity?
A. Carbon dioxide
B. Aluminum powder
C. Carbon tetrachloride
D. Water with class A foam added

Which classes of fire extinguisher include a number in their classification?
A. M and A
B. A and B
C. C and M
D. B and C

Why would a fire extinguisher class icon have a red slash through it?
A. Because using the extinguisher on that class
of fire would be ineffective
B. Because using the extinguisher on that class
of fire would create additional risk
C. Because the use of that type of extinguisher
on that class has not been tested
D. Because it is illegal to use that type of
extinguisher on that class of fire for environmental reasons

What is another word for when a material begins to burn?
A. Evolution temperature
B. Flash point
C. Ignition point
D. Liquefaction temperature

Why can dry chemical extinguishers be used on class C fires?
A. Dry chemicals are
chemically similar to water.
B. Dry chemicals do not
conduct electricity.
C. Dry chemicals never
actually touch the fuel.
D. Dry chemicals are themselves electrically
static.

How is the numerical rating of class K
extinguishers assigned?
A. On the basis of square feet of burning fuel
extinguished by an expert
B. On the basis of square feet of burning fuel
extinguished by a lay person
C. On the basis of a mathematical formula and
the net weight of agent
D. There is no such rating assigned.

What is generally the maximum distance a CO2 extinguisher can be expected to reach?
A. 32 feet
B. 4 feet
C. 16 feet
D. 8 feet

The horns of some older carbon dioxide
extinguishers are made of a substance that both negates their class C rating and makes them dangerous for use on class C fires. What substance are those older horns made of?
A. Wood
B. Clay
C. Metal
D. Bone

Bromochlorodifluoromethane, although a big word, should be recognized by fire fighters as a certain type of extinguishing agent. What agent?
A. Halon 1211
B. MetalX
C. CO2
D. Carbon tet

How many gallons of water are contained in a class A fire extinguisher with a numerical rating of 2?
A. 2.5
B. 2.0
C. 1.0
D. 1.5

Fire extinguishers are rated for their ability to control a specific type of fire and their:
A. ease of use.
B. overall weight.
C. reach of agent.
D. ability to prevent rekindling.

According to NFPA 10, the maximum floor area that can be protected by each extinguisher depends on:
A. the building’s history of fire.
B. the skill of the user.
C. the occupancy type.
D. the water supply.

How are occupancy use category and hazard classification related?
A. They are not necessarily related.
B. They are the same thing.
C. Occupancy determines hazard.
D. Hazard determines occupancy.

What extinguishing method is being used when a foam blanket is placed over the surface of a
burning liquid?
A. Cutting off the oxygen
B. Reflecting evolved heat back into the fire
C. Chemically converting the fuel to a non-fuel
D. Cooling the fuel below its kindling temperature

What do the chemicals in multipurpose dry chemical extinguishers do to prevent rekindling of thefuel?
A. They form a crust overthe fuel.
B. They form a blanket of foam over the fuel.
C. They chemically bond to the fuel, making it
non-combustible.
D. They do nothing to prevent rekindling.

Select the true statement regarding class A and B foam fire extinguishers and their use on the
unintended class of fire.
A. Either extinguisher may be used to some
B. Class B extinguishers may be used to some effect on class A fires.
C. Class A extinguishers may be used to some effect on class B fires.
effect on either class of fire.

D. Neither extinguisher can be used to any
effect on the other class of fire.

How much of a dry chemical extinguisher’s full load must be used before it requires recharging?
A. More than 30%
B. All of it
C. Any at all
D. More than 70%

If a fire extinguisher containing ammonium phosphate is used on a class K fire, not only will it be ineffective, but it can actually worsen the problem. How?
A. It can neutralize the foaming properties of
any alkaline agent applied to the fire.
B. It will evolve hydrogen cyanide gas, a deadly
and penetrating poison.
C. It will cause a rapid polymerization,
resulting in a near-BLEVE expansion of the fuel.
D. It can cause the fuel to
heat up internally to reacquire its flash point.

Does it matter which type of dry powder
extinguisher is used on which type of burning metal?
A. Yes, each type of metal is marked with which
type of dry powder to use in case of fire.
B. Yes, each dry powder extinguisher
is marked with what types of metal it can handle.
C. No, one dry powder
extinguisher will work on any kind of metal.
D. No, one type of metal will respond to any
type of dry powder.

What can be added to water extinguishers to reduce the surface area of water and thereby to aid in
extinguishment of fuels such as baled cotton or fibrous materials?
A. Alkali metal salt
B. Alcohol
C. Quick water
D. Wetting agent

What is the weight of
carbon dioxide in comparison to air?
A. 2.0
B. 1.5
C. 1.0
D. 0.5