FIRE PROTECTION CERTIFICATION
NFPA 10 Study Guide(NFPA 10- Standard for Portable Fire Extinguishers. Texas
Insurance Code Chapter 6001- Fire Extinguisher Service and Installation and 28 TAC
34.500- The Fire Extinguisher Rules) 2026/2027
Complete Blueprint Coverage A+
A+ 5 100%
QUESTIONS VERIFIED CORE DOMAINS COVERED RATIONALES INCLUDED
CATEGORIES
Fire Classification and Extinguisher Types
Selection, Placement, and Distribution
Inspection, Maintenance, and Testing (NFPA 10)
Texas Licensing, Installation, and Service Rules
Servicing Procedures, Hydrostatic Testing, and Recordkeeping
STUVIAACTUALEXAM
,NFPA 10 Study Guide(NFPA 10- Standard for Portable Fire Extinguishers. Texas Insurance Code Chapter 6001- Fire Extinguisher Service and Installation and 28
Page
TAC2 34.500- The Fire Exting
FIRE CLASSIFICATION AND EXTINGUISHER TYPES
Q1
A technician arrives at a commercial kitchen where a deep-fat fryer fire has been extinguished with a portable unit. The
residual agent is a potassium-acetate-based solution. The technician must identify the fire class that this agent is
specifically listed to combat and confirm the extinguisher type used.
A. Class B hydrocarbon fuel fire extinguished with multipurpose dry chemical
B. Class K cooking-media fire extinguished with a wet-chemical extinguisher
C. Class A ordinary combustible fire extinguished with water mist
D. Class C energized electrical fire extinguished with carbon dioxide
Correct Answer: B
Wet-chemical extinguishers containing potassium acetate or similar salts are specifically listed for Class K fires involving combustible
cooking oils and fats. Multipurpose dry chemical is rated for A-B-C, water mist for A and some C, and CO2 primarily for B and C; none
of those agents match the described residue or the deep-fat fryer scenario.
Q2
During a facility survey an inspector notes a portable extinguisher labeled only with a Class D rating and a pictogram of
a metal fire. The extinguisher contains a sodium-chloride-based dry powder. The inspector must determine the correct
application limitation for this unit.
A. It may be used on ordinary combustibles and flammable liquids in addition to metals
B. It is intended solely for combustible metal fires and must not be used on other classes
C. It is interchangeable with multipurpose dry chemical for any fire involving aluminum
D. It may be used on energized electrical equipment provided the powder is non-conductive
Correct Answer: B
Class D extinguishers are formulated and listed exclusively for combustible metal fires. Using them on Class A, B, or C fires is
ineffective and can create additional hazards. Sodium-chloride powders are metal-specific and are not multipurpose or electrically
rated for general use.
Q3
A warehouse stores large quantities of flammable liquids in closed containers. The safety officer must select portable
extinguishers that carry a numerical Class B rating. The officer needs to understand what the numerical rating
quantifies.
A. The approximate square footage of a deep-layer flammable-liquid fire that a non-expert can extinguish
B. The maximum volume of flammable liquid the extinguisher can hold in its cylinder
C. The number of years the extinguisher remains under manufacturer warranty
D. The minimum travel distance in feet required between the extinguisher and the hazard
Correct Answer: A
The Class B numerical rating indicates the approximate area (in square feet) of a flammable-liquid fire that a novice operator can
extinguish under test conditions. It is not a measure of cylinder volume, warranty period, or travel-distance requirement.
Q4
An office complex contains both ordinary combustibles and energized electronic equipment. The facility manager is
choosing between a water-based extinguisher and a clean-agent unit. The manager must identify the primary
advantage of a clean-agent extinguisher in this mixed-occupancy setting.
A. Clean agents leave no residue and are non-conductive, protecting electronics while still addressing Class A and B fuels
B. Clean agents provide the highest Class A rating of any portable extinguisher type
C. Clean agents are the only agents permitted for use on Class K cooking fires
D. Clean agents eliminate the need for hydrostatic testing throughout the service life of the cylinder
Correct Answer: A
Clean-agent extinguishers (e.g., HFC or fluoro-ketone formulations) are non-conductive and leave no residue, making them suitable
for areas with sensitive electronics while retaining Class A and B effectiveness. They do not carry the highest Class A ratings, are not
listed for Class K, and still require hydrostatic testing on the prescribed schedule.
STUVIAACTUALEXAM
, NFPA 10 Study Guide(NFPA 10- Standard for Portable Fire Extinguishers. Texas Insurance Code Chapter 6001- Fire Extinguisher Service and Installation and 28
Page
TAC3 34.500- The Fire Exting
Q5
A technician is asked to replace an extinguisher that previously contained aqueous film-forming foam (AFFF). The
replacement must maintain the same Class B capability for hydrocarbon fuels. The technician evaluates whether a
fluorine-free foam alternative is acceptable under current listing requirements.
A. Any foam solution may be substituted without regard to listing because all foams act by the same film-forming
mechanism
B. Only agents that carry a current UL or equivalent listing for the specific Class B application may be used as replacements
C. Fluorine-free foams are prohibited for all portable extinguishers under NFPA 10
D. AFFF units may be converted to water-only service by simply draining the foam concentrate
Correct Answer: B
NFPA 10 requires that extinguishing agents and extinguishers be listed for the intended hazard. Substitution is permitted only when
the replacement agent and unit carry an appropriate listing. Arbitrary substitution or conversion without listing voids the rating and can
create an ineffective system.
Q6
A laboratory uses a carbon-dioxide extinguisher rated 10-B:C. During a training drill an instructor asks why this
extinguisher carries no Class A rating even though CO2 can cool some ordinary combustibles. The correct explanation
centers on the extinguishing mechanism.
A. CO2 extinguishes primarily by oxygen displacement and leaves no cooling residue sufficient for deep-seated Class A
fires
B. CO2 cylinders are prohibited from carrying any Class A rating by federal transportation regulations
C. CO2 is too conductive to be safely applied near ordinary combustibles
D. CO2 ratings are limited to Class D metal fires only
Correct Answer: A
Carbon dioxide extinguishes by diluting oxygen and providing limited cooling; it does not produce the sustained cooling or penetration
needed for deep-seated Class A fires. Consequently listed CO2 extinguishers are rated only for Class B and C. Conductivity and
Class D limitations do not apply.
Q7
A maintenance supervisor discovers an older extinguisher marked with a numerical Class A rating of 2-A and a Class
B rating of 10-B:C. The supervisor needs to interpret what the 2-A portion of the rating indicates about extinguishing
capability.
A. The extinguisher is equivalent in Class A effectiveness to 2.5 gallons of water
B. The extinguisher can protect a maximum floor area of 2 square feet
C. The extinguisher weighs exactly 2 pounds when fully charged
D. The extinguisher must be mounted no higher than 2 feet above the floor
Correct Answer: A
Under the UL rating system a 1-A rating equals the extinguishing capability of 1.25 gallons of water; therefore a 2-A rating
corresponds to 2.5 gallons of water equivalence. The number does not represent floor area, weight, or mounting height.
Q8
An automotive repair shop has both flammable liquid storage and live electrical diagnostic equipment. The owner asks
whether a multipurpose dry-chemical extinguisher rated 4-A:60-B:C can be used on an energized electrical panel fire.
The correct technical response addresses agent conductivity and listing.
A. Yes, because the C rating confirms the agent is non-conductive when used on energized electrical equipment
B. No, dry chemical must never be used near any electrical equipment regardless of rating
C. Only after the power is confirmed de-energized, because the C rating applies solely to residual heat
D. Only if the extinguisher is first converted to a water-based agent
Correct Answer: A
The Class C rating indicates that the agent has been tested and found non-conductive, permitting use on energized electrical
equipment. Multipurpose dry chemical with a C rating is therefore appropriate; de-energizing is preferred when practical but is not a
prerequisite for the rating itself.
STUVIAACTUALEXAM
NFPA 10 Study Guide(NFPA 10- Standard for Portable Fire Extinguishers. Texas
Insurance Code Chapter 6001- Fire Extinguisher Service and Installation and 28 TAC
34.500- The Fire Extinguisher Rules) 2026/2027
Complete Blueprint Coverage A+
A+ 5 100%
QUESTIONS VERIFIED CORE DOMAINS COVERED RATIONALES INCLUDED
CATEGORIES
Fire Classification and Extinguisher Types
Selection, Placement, and Distribution
Inspection, Maintenance, and Testing (NFPA 10)
Texas Licensing, Installation, and Service Rules
Servicing Procedures, Hydrostatic Testing, and Recordkeeping
STUVIAACTUALEXAM
,NFPA 10 Study Guide(NFPA 10- Standard for Portable Fire Extinguishers. Texas Insurance Code Chapter 6001- Fire Extinguisher Service and Installation and 28
Page
TAC2 34.500- The Fire Exting
FIRE CLASSIFICATION AND EXTINGUISHER TYPES
Q1
A technician arrives at a commercial kitchen where a deep-fat fryer fire has been extinguished with a portable unit. The
residual agent is a potassium-acetate-based solution. The technician must identify the fire class that this agent is
specifically listed to combat and confirm the extinguisher type used.
A. Class B hydrocarbon fuel fire extinguished with multipurpose dry chemical
B. Class K cooking-media fire extinguished with a wet-chemical extinguisher
C. Class A ordinary combustible fire extinguished with water mist
D. Class C energized electrical fire extinguished with carbon dioxide
Correct Answer: B
Wet-chemical extinguishers containing potassium acetate or similar salts are specifically listed for Class K fires involving combustible
cooking oils and fats. Multipurpose dry chemical is rated for A-B-C, water mist for A and some C, and CO2 primarily for B and C; none
of those agents match the described residue or the deep-fat fryer scenario.
Q2
During a facility survey an inspector notes a portable extinguisher labeled only with a Class D rating and a pictogram of
a metal fire. The extinguisher contains a sodium-chloride-based dry powder. The inspector must determine the correct
application limitation for this unit.
A. It may be used on ordinary combustibles and flammable liquids in addition to metals
B. It is intended solely for combustible metal fires and must not be used on other classes
C. It is interchangeable with multipurpose dry chemical for any fire involving aluminum
D. It may be used on energized electrical equipment provided the powder is non-conductive
Correct Answer: B
Class D extinguishers are formulated and listed exclusively for combustible metal fires. Using them on Class A, B, or C fires is
ineffective and can create additional hazards. Sodium-chloride powders are metal-specific and are not multipurpose or electrically
rated for general use.
Q3
A warehouse stores large quantities of flammable liquids in closed containers. The safety officer must select portable
extinguishers that carry a numerical Class B rating. The officer needs to understand what the numerical rating
quantifies.
A. The approximate square footage of a deep-layer flammable-liquid fire that a non-expert can extinguish
B. The maximum volume of flammable liquid the extinguisher can hold in its cylinder
C. The number of years the extinguisher remains under manufacturer warranty
D. The minimum travel distance in feet required between the extinguisher and the hazard
Correct Answer: A
The Class B numerical rating indicates the approximate area (in square feet) of a flammable-liquid fire that a novice operator can
extinguish under test conditions. It is not a measure of cylinder volume, warranty period, or travel-distance requirement.
Q4
An office complex contains both ordinary combustibles and energized electronic equipment. The facility manager is
choosing between a water-based extinguisher and a clean-agent unit. The manager must identify the primary
advantage of a clean-agent extinguisher in this mixed-occupancy setting.
A. Clean agents leave no residue and are non-conductive, protecting electronics while still addressing Class A and B fuels
B. Clean agents provide the highest Class A rating of any portable extinguisher type
C. Clean agents are the only agents permitted for use on Class K cooking fires
D. Clean agents eliminate the need for hydrostatic testing throughout the service life of the cylinder
Correct Answer: A
Clean-agent extinguishers (e.g., HFC or fluoro-ketone formulations) are non-conductive and leave no residue, making them suitable
for areas with sensitive electronics while retaining Class A and B effectiveness. They do not carry the highest Class A ratings, are not
listed for Class K, and still require hydrostatic testing on the prescribed schedule.
STUVIAACTUALEXAM
, NFPA 10 Study Guide(NFPA 10- Standard for Portable Fire Extinguishers. Texas Insurance Code Chapter 6001- Fire Extinguisher Service and Installation and 28
Page
TAC3 34.500- The Fire Exting
Q5
A technician is asked to replace an extinguisher that previously contained aqueous film-forming foam (AFFF). The
replacement must maintain the same Class B capability for hydrocarbon fuels. The technician evaluates whether a
fluorine-free foam alternative is acceptable under current listing requirements.
A. Any foam solution may be substituted without regard to listing because all foams act by the same film-forming
mechanism
B. Only agents that carry a current UL or equivalent listing for the specific Class B application may be used as replacements
C. Fluorine-free foams are prohibited for all portable extinguishers under NFPA 10
D. AFFF units may be converted to water-only service by simply draining the foam concentrate
Correct Answer: B
NFPA 10 requires that extinguishing agents and extinguishers be listed for the intended hazard. Substitution is permitted only when
the replacement agent and unit carry an appropriate listing. Arbitrary substitution or conversion without listing voids the rating and can
create an ineffective system.
Q6
A laboratory uses a carbon-dioxide extinguisher rated 10-B:C. During a training drill an instructor asks why this
extinguisher carries no Class A rating even though CO2 can cool some ordinary combustibles. The correct explanation
centers on the extinguishing mechanism.
A. CO2 extinguishes primarily by oxygen displacement and leaves no cooling residue sufficient for deep-seated Class A
fires
B. CO2 cylinders are prohibited from carrying any Class A rating by federal transportation regulations
C. CO2 is too conductive to be safely applied near ordinary combustibles
D. CO2 ratings are limited to Class D metal fires only
Correct Answer: A
Carbon dioxide extinguishes by diluting oxygen and providing limited cooling; it does not produce the sustained cooling or penetration
needed for deep-seated Class A fires. Consequently listed CO2 extinguishers are rated only for Class B and C. Conductivity and
Class D limitations do not apply.
Q7
A maintenance supervisor discovers an older extinguisher marked with a numerical Class A rating of 2-A and a Class
B rating of 10-B:C. The supervisor needs to interpret what the 2-A portion of the rating indicates about extinguishing
capability.
A. The extinguisher is equivalent in Class A effectiveness to 2.5 gallons of water
B. The extinguisher can protect a maximum floor area of 2 square feet
C. The extinguisher weighs exactly 2 pounds when fully charged
D. The extinguisher must be mounted no higher than 2 feet above the floor
Correct Answer: A
Under the UL rating system a 1-A rating equals the extinguishing capability of 1.25 gallons of water; therefore a 2-A rating
corresponds to 2.5 gallons of water equivalence. The number does not represent floor area, weight, or mounting height.
Q8
An automotive repair shop has both flammable liquid storage and live electrical diagnostic equipment. The owner asks
whether a multipurpose dry-chemical extinguisher rated 4-A:60-B:C can be used on an energized electrical panel fire.
The correct technical response addresses agent conductivity and listing.
A. Yes, because the C rating confirms the agent is non-conductive when used on energized electrical equipment
B. No, dry chemical must never be used near any electrical equipment regardless of rating
C. Only after the power is confirmed de-energized, because the C rating applies solely to residual heat
D. Only if the extinguisher is first converted to a water-based agent
Correct Answer: A
The Class C rating indicates that the agent has been tested and found non-conductive, permitting use on energized electrical
equipment. Multipurpose dry chemical with a C rating is therefore appropriate; de-energizing is preferred when practical but is not a
prerequisite for the rating itself.
STUVIAACTUALEXAM
