IFSTA: Chapter 6: Portable Fire
Extinguishers UPDATED ACTUAL Exam
Questions and CORECT Answers
Extinguishing Agent - CORRECT ANSWER - Any substance used for the purpose of
controlling or extinguishing a fire.
Class A fire - CORRECT ANSWER - Fires involving ordinary combustibles such as wood,
paper, cloth, and similar materials.
Class B Fires - CORRECT ANSWER - Fires in flammable liquids, combustible liquids,
petroleum greases, tars, oils, oil-based paints, solvents, lacquers, alcohols, and flammable gases.
Class C Fires - CORRECT ANSWER - Fires involving energized electrical equipment
Class D Fires - CORRECT ANSWER - Fires involving combustible metals such as
magnesium, titanium, zirconium, sodium, and potassium.
Class K Fires - CORRECT ANSWER - Fires in cooking appliances that involve combustible
cooking
media (vegetable or animal oils and fats).
Dry Powder - CORRECT ANSWER - Extinguisher agent suitable for use on combustible
metal fires
Wet Chemical Systems - CORRECT ANSWER - extinguishing system that uses a wet
chemical solution as the primary extinguishing agent
Saponification - CORRECT ANSWER - when mixtures of alkaline based chemicals and
certain cooking oils come into contact, resulting in soapy film
, Smothering - CORRECT ANSWER - Act of excluding oxygen from a fuel.
Water Mist Extinguisher - CORRECT ANSWER - Fire extinguisher capable of discharging
atomized water through a special applicator; pressurized water mist extinguishers use distilled
water, whereas back-pump water mist extinguishers use ordinary water.
Aqueous Film Forming Foam (AFFF) - CORRECT ANSWER - Synthetic foam concentrate
that, when combined with water, can form a complete vapor barrier over fuel spills and fires and
is a highly effective extinguishing and blanketing agent on hydrocarbon fuels.
Air-Aspirating Foam Nozzle - CORRECT ANSWER - Foam nozzle designed to provide the
aeration required to make the highest quality foam possible; most effective appliance for the
generation of low-expansion foam.
Halogenated Extinguishing Agents - CORRECT ANSWER - Chemical compounds
(halogenated hydrocarbons) that contain carbon plus one or more elements from the halogen
series. Halon 1301 and Halon 1211 are most commonly used as extinguishing agents for Class B
and Class C fires. Also known as Halogenated Hydrocarbons.
T/F: Portable fire extinguishers are often suitable for more than one class of fire. - CORRECT
ANSWER - TRUE
T/F: Class C extinguishing agents are capable of conducting electricity. - CORRECT
ANSWER - FALSE: they do NOT conduct electricity
T/F: A portable fire extinguisher should be used only for the fire type or type for which it is
intended. - CORRECT ANSWER - TRUE
T/F: Generally, water and water based agents cannot be used on a Class C fire until the
electricity has been shut off. - CORRECT ANSWER - TRUE
Extinguishers UPDATED ACTUAL Exam
Questions and CORECT Answers
Extinguishing Agent - CORRECT ANSWER - Any substance used for the purpose of
controlling or extinguishing a fire.
Class A fire - CORRECT ANSWER - Fires involving ordinary combustibles such as wood,
paper, cloth, and similar materials.
Class B Fires - CORRECT ANSWER - Fires in flammable liquids, combustible liquids,
petroleum greases, tars, oils, oil-based paints, solvents, lacquers, alcohols, and flammable gases.
Class C Fires - CORRECT ANSWER - Fires involving energized electrical equipment
Class D Fires - CORRECT ANSWER - Fires involving combustible metals such as
magnesium, titanium, zirconium, sodium, and potassium.
Class K Fires - CORRECT ANSWER - Fires in cooking appliances that involve combustible
cooking
media (vegetable or animal oils and fats).
Dry Powder - CORRECT ANSWER - Extinguisher agent suitable for use on combustible
metal fires
Wet Chemical Systems - CORRECT ANSWER - extinguishing system that uses a wet
chemical solution as the primary extinguishing agent
Saponification - CORRECT ANSWER - when mixtures of alkaline based chemicals and
certain cooking oils come into contact, resulting in soapy film
, Smothering - CORRECT ANSWER - Act of excluding oxygen from a fuel.
Water Mist Extinguisher - CORRECT ANSWER - Fire extinguisher capable of discharging
atomized water through a special applicator; pressurized water mist extinguishers use distilled
water, whereas back-pump water mist extinguishers use ordinary water.
Aqueous Film Forming Foam (AFFF) - CORRECT ANSWER - Synthetic foam concentrate
that, when combined with water, can form a complete vapor barrier over fuel spills and fires and
is a highly effective extinguishing and blanketing agent on hydrocarbon fuels.
Air-Aspirating Foam Nozzle - CORRECT ANSWER - Foam nozzle designed to provide the
aeration required to make the highest quality foam possible; most effective appliance for the
generation of low-expansion foam.
Halogenated Extinguishing Agents - CORRECT ANSWER - Chemical compounds
(halogenated hydrocarbons) that contain carbon plus one or more elements from the halogen
series. Halon 1301 and Halon 1211 are most commonly used as extinguishing agents for Class B
and Class C fires. Also known as Halogenated Hydrocarbons.
T/F: Portable fire extinguishers are often suitable for more than one class of fire. - CORRECT
ANSWER - TRUE
T/F: Class C extinguishing agents are capable of conducting electricity. - CORRECT
ANSWER - FALSE: they do NOT conduct electricity
T/F: A portable fire extinguisher should be used only for the fire type or type for which it is
intended. - CORRECT ANSWER - TRUE
T/F: Generally, water and water based agents cannot be used on a Class C fire until the
electricity has been shut off. - CORRECT ANSWER - TRUE
