NFPA 10 Study Set 2026 Questions and
Correct Detailed Answers Already
Graded A+
Dry Chemical Agents - CORRECT ANSWER-Are nontoxic and generally
considered quite safe to use. However, the cloud of chemicals may reduce
visibility and create respiratory problems.
Dry Powder Extinguishers - CORRECT ANSWER-Some can be applied with
portable extinguishers, but others must be applied with either a shovel or a
scoop.
Class B Numerical Rating - CORRECT ANSWER-Based on the approximate
square foot area of a flammable liquid fire that a nonexpert operator can
extinguish using 1 full extinguisher. Ratings range from 1-B to 640-B
Class D Rating Factors - CORRECT ANSWER-Reactions between the metal and
the agent. Toxicity of the agent. Toxicity of the fumes produced and the products
of combustion. Time to allow metal to burn completely compared to the time to
extinguish the fire using the extinguisher.
,Class Specific Ratings - CORRECT ANSWER-Are independent and do not affect
each other. (p. 353)
Selecting the Proper Fire Extinguisher - CORRECT ANSWER-Should be done
properly to minimize the risk to life and property and the extinguisher should be
effective in extinguishing the fire.
Should be Selected First - CORRECT ANSWER-The appropriate size and type of
extinguisher.
Should be Done After Selecting Size and Type - CORRECT ANSWER-Make a
quick visual inspection of the fire extinguisher.
Portable Fire Extinguishers - CORRECT ANSWER-Classified by the type of fire
they extinguish.
5 - CORRECT ANSWER-The number of classes of portable fire extinguishers.
Classes of Portable Fire Extinguishers - CORRECT ANSWER-A, B, C, D, K
,Source of the Fire - CORRECT ANSWER-Must be determined before the proper
portable fire extinguisher can be selected.
Certain Extinguishing Agents - CORRECT ANSWER-Only effective on certain
classes of fire or fuels.
Class A - CORRECT ANSWER-Involve ordinary combustibles such as textiles,
paper, plastics, rubber, and wood.
Class B - CORRECT ANSWER-Involve flammable and combustible liquids and
gases, such as alcohol, gasoline, lubricating oils, and liquified petroleum gas (LPG).
Class C - CORRECT ANSWER-Involved energized electrical equipment.
Class D - CORRECT ANSWER-Involve combustible metals and alloys such as
lithium, magnesium, potassium, and sodium.
Class K - CORRECT ANSWER-Involve combustible cooking oils such as
vegetable or animal fats and oils that burn at extremely high temperatures.
Smothering - CORRECT ANSWER-Excluding oxygen from the burning process.
, Cooling - CORRECT ANSWER-Reducing the burning material below its ignition
temperature.
Chain Breaking - CORRECT ANSWER-Interrupting the chemical chain reaction
in the burning process.
Saponification - CORRECT ANSWER-Forming an oxygen-excluding soapy foam
surface.
Manual Pump - CORRECT ANSWER-Mechanism by which the operator
physically applies pressure to a pump that increases pressure within the
container, forcing the agent out a nozzle at the end of a hose.
Mechanism - CORRECT ANSWER-The process by which a portable fire
extinguisher expels its contents.
Pump-type Extinguishers - CORRECT ANSWER-Intended primarily for use on
ground fires.
Correct Detailed Answers Already
Graded A+
Dry Chemical Agents - CORRECT ANSWER-Are nontoxic and generally
considered quite safe to use. However, the cloud of chemicals may reduce
visibility and create respiratory problems.
Dry Powder Extinguishers - CORRECT ANSWER-Some can be applied with
portable extinguishers, but others must be applied with either a shovel or a
scoop.
Class B Numerical Rating - CORRECT ANSWER-Based on the approximate
square foot area of a flammable liquid fire that a nonexpert operator can
extinguish using 1 full extinguisher. Ratings range from 1-B to 640-B
Class D Rating Factors - CORRECT ANSWER-Reactions between the metal and
the agent. Toxicity of the agent. Toxicity of the fumes produced and the products
of combustion. Time to allow metal to burn completely compared to the time to
extinguish the fire using the extinguisher.
,Class Specific Ratings - CORRECT ANSWER-Are independent and do not affect
each other. (p. 353)
Selecting the Proper Fire Extinguisher - CORRECT ANSWER-Should be done
properly to minimize the risk to life and property and the extinguisher should be
effective in extinguishing the fire.
Should be Selected First - CORRECT ANSWER-The appropriate size and type of
extinguisher.
Should be Done After Selecting Size and Type - CORRECT ANSWER-Make a
quick visual inspection of the fire extinguisher.
Portable Fire Extinguishers - CORRECT ANSWER-Classified by the type of fire
they extinguish.
5 - CORRECT ANSWER-The number of classes of portable fire extinguishers.
Classes of Portable Fire Extinguishers - CORRECT ANSWER-A, B, C, D, K
,Source of the Fire - CORRECT ANSWER-Must be determined before the proper
portable fire extinguisher can be selected.
Certain Extinguishing Agents - CORRECT ANSWER-Only effective on certain
classes of fire or fuels.
Class A - CORRECT ANSWER-Involve ordinary combustibles such as textiles,
paper, plastics, rubber, and wood.
Class B - CORRECT ANSWER-Involve flammable and combustible liquids and
gases, such as alcohol, gasoline, lubricating oils, and liquified petroleum gas (LPG).
Class C - CORRECT ANSWER-Involved energized electrical equipment.
Class D - CORRECT ANSWER-Involve combustible metals and alloys such as
lithium, magnesium, potassium, and sodium.
Class K - CORRECT ANSWER-Involve combustible cooking oils such as
vegetable or animal fats and oils that burn at extremely high temperatures.
Smothering - CORRECT ANSWER-Excluding oxygen from the burning process.
, Cooling - CORRECT ANSWER-Reducing the burning material below its ignition
temperature.
Chain Breaking - CORRECT ANSWER-Interrupting the chemical chain reaction
in the burning process.
Saponification - CORRECT ANSWER-Forming an oxygen-excluding soapy foam
surface.
Manual Pump - CORRECT ANSWER-Mechanism by which the operator
physically applies pressure to a pump that increases pressure within the
container, forcing the agent out a nozzle at the end of a hose.
Mechanism - CORRECT ANSWER-The process by which a portable fire
extinguisher expels its contents.
Pump-type Extinguishers - CORRECT ANSWER-Intended primarily for use on
ground fires.
