ICC/NAFED Certified Portable Fire Extinguisher Technician (FE) — Questions and Answers

Question 1: What is a key limitation of using CO2 extinguishers outdoors?

CO2 is illegal for outdoor use
CO2 pressure drops below operating level outdoors
Wind disperses the CO2 cloud, significantly reducing extinguishing effectiveness (Correct answer)
CO2 damages vegetation

Correct answer: Wind disperses the CO2 cloud, significantly reducing extinguishing effectiveness

Wind rapidly disperses the CO2 cloud, preventing it from building up the concentration needed to extinguish the fire.

Question 2: A stored-pressure dry chemical extinguisher differs from a cartridge-operated unit primarily in that it:

Contains both agent and expellant gas in a single cylinder (Correct answer)
Requires no pressure gauge
Uses a different chemical agent
Has the expellant gas stored separately in a cartridge

Correct answer: Contains both agent and expellant gas in a single cylinder

In stored-pressure units, the propellant gas and dry chemical agent share the same cylinder, unlike cartridge-operated units.

Question 3: Inert gas blends such as Inergen (IG-541, a mix of nitrogen, argon, and CO2) extinguish fires by which primary mechanism?

Reducing oxygen concentration to approximately 12-15% while maintaining breathability (Correct answer)
Chemical chain reaction inhibition similar to halon
Cooling the burning material below its auto-ignition temperature
Saponification of fuel vapors at the flame front

Correct answer: Reducing oxygen concentration to approximately 12-15% while maintaining breathability

Inert gas agents reduce oxygen to approximately 12-15%, which is below the ~16% needed to sustain combustion but above the ~10% level dangerous to human life for brief exposure.

Question 4: Under NFPA 10, which entity is responsible for ensuring fire extinguishers are properly inspected and maintained?

The extinguisher manufacturer
The owner or the designated occupant representative (Correct answer)
The local fire department
The insurance company

Correct answer: The owner or the designated occupant representative

NFPA 10 places the responsibility for inspection and maintenance of fire extinguishers on the owner or the designated occupant representative.

Question 5: Which condition would most likely cause a technician to upgrade an area's hazard classification from ordinary to extra hazard during an assessment?

Large quantities of flammable liquids stored on open shelving (Correct answer)
A single photocopier in a break room
Carpeted floors in an office building
Wall-mounted electrical panels in a utility closet

Correct answer: Large quantities of flammable liquids stored on open shelving

Large quantities of flammable liquids stored openly significantly increase fire load and spread potential, warranting extra hazard classification.

Question 6: During maintenance of a wheeled fire extinguisher, NFPA 10 requires the hose and nozzle assembly to be inspected for what condition in particular?

Hose length conforming to manufacturer's specifications
Freedom from cracks, cuts, abrasions, and obstructions (Correct answer)
Pressure test record attached to the hose coupling
Color coding matching the agent type

Correct answer: Freedom from cracks, cuts, abrasions, and obstructions

The hose must be checked for cracks, cuts, abrasions, and any obstructions that would impede flow or cause burst failure during use.

Question 7: How should risks be prioritized during fire risk assessments?

By the severity of the risk and its likelihood (Correct answer)
By the time of year.
By the cost of mitigation.
By how easily it can be controlled.

Correct answer: By the severity of the risk and its likelihood

During fire risk assessments, risks should be prioritized by the severity of the risk and its likelihood. This means focusing on hazards that have the potential for the most severe consequences and are most likely to occur. This approach ensures that the most critical and probable risks are addressed first, optimizing safety efforts and resource allocation.

Question 8: What is the function of the discharge nozzle horn on a CO2 extinguisher?

Directs the CO2 stream and reduces static discharge risk (Correct answer)
Acts as a carrying handle
Prevents freezing of the valve
Indicates pressure level

Correct answer: Directs the CO2 stream and reduces static discharge risk

The CO2 horn directs the gas stream at the fire and is made of non-conductive material to reduce the risk of static discharge.

Question 9: What information must be recorded on a fire extinguisher after hydrostatic testing?

Only the next test due date
Inspector name only
Manufacturer part number
Test date, test pressure, and tester identity stamped or labeled on the cylinder (Correct answer)

Correct answer: Test date, test pressure, and tester identity stamped or labeled on the cylinder

After hydrostatic testing, the test date, pressure used, and the identity of the testing facility must be permanently marked on the cylinder.

Question 10: Which regulatory authority governs the hydrostatic testing of fire extinguisher cylinders in the United States?

DOT (Department of Transportation) (Correct answer)
OSHA
EPA
CPSC

Correct answer: DOT (Department of Transportation)

The DOT regulates the design, manufacture, testing, and marking of pressure vessels including fire extinguisher cylinders.

Question 11: Which of the following is the correct classification for a fire extinguisher used on electrical fires?

Class B
Class C (Correct answer)
Class A
Class D

Correct answer: Class C

Class C fires involve energized electrical equipment. Class C fire extinguishers are specifically designed to be non-conductive, meaning they will not transmit electricity. This makes them safe and effective for extinguishing electrical fires without posing a risk of electrocution to the user.

Question 12: Which fire extinguisher type is most appropriate for a laboratory that stores both flammable solvents and sensitive analytical instruments?

Carbon dioxide (CO2)
Water mist
Dry chemical (ABC)
Clean agent (halogenated hydrocarbon) (Correct answer)

Correct answer: Clean agent (halogenated hydrocarbon)

Clean agents suppress Class B fires without leaving residue or damaging sensitive instruments, making them ideal for laboratory environments.

Question 13: A risk assessment reveals a workshop with magnesium shavings accumulating on the floor. Which hazard classification applies?

Class A
Class B
Class D (Correct answer)
Class C

Correct answer: Class D

Magnesium is a combustible metal and represents a Class D fire hazard.

Question 14: Halon 1211 (bromochlorodifluoromethane) is classified as what type of extinguishing agent?

Wet chemical agent
Dry powder agent
Inert gas agent
Halogenated agent (Correct answer)

Correct answer: Halogenated agent

Halon 1211 is a halogenated (halocarbon) agent that extinguishes fire by chemically interrupting the combustion chain reaction.

Question 15: The PASS acronym used to operate a fire extinguisher stands for:

Pull, Aim, Squeeze, Sweep (Correct answer)
Point, Activate, Stand back, Spray
Pull, Assess, Stand, Spray
Press, Aim, Squeeze, Spread

Correct answer: Pull, Aim, Squeeze, Sweep

PASS stands for Pull the pin, Aim at the base of the fire, Squeeze the handle, and Sweep side to side.

Question 16: A CO2 extinguisher is considered to require recharging when its weight loss exceeds what threshold?

15% of net agent weight
10% of net agent weight or 1 lb, whichever is less (Correct answer)
5% of net agent weight or 1 lb, whichever is less
Any measurable weight loss

Correct answer: 10% of net agent weight or 1 lb, whichever is less

NFPA 10 specifies recharging when CO2 weight loss exceeds 10% of the net listed agent weight or 1 lb, whichever is less.

Question 17: When an extinguisher is installed outdoors, what additional protection is typically required?

A weatherproof cabinet or protective cover (Correct answer)
None — all extinguishers are outdoor-rated
Replacement with a larger unit
Doubled inspection frequency only

Correct answer: A weatherproof cabinet or protective cover

Outdoor extinguishers must be protected from weather, UV exposure, and physical damage using a weatherproof cabinet or cover.

Question 18: Which fire extinguisher type should never be used on a liquid fire?

Class C
Class A (water-based) (Correct answer)
Class B
Class A

Correct answer: Class A (water-based)

Class A (water-based) fire extinguishers are designed for ordinary combustibles like wood and paper. Using water on a Class B (liquid) fire can be extremely dangerous as it can spread the flammable liquid, making the fire larger and more difficult to control. Water can also cause a violent reaction if the liquid is superheated.

Question 19: Purple-K dry chemical extinguishing agent contains which primary chemical compound?

Potassium bicarbonate (Correct answer)
Monoammonium phosphate
Sodium bicarbonate
Potassium chloride

Correct answer: Potassium bicarbonate

Purple-K is a potassium bicarbonate-based dry chemical agent, which is approximately twice as effective as sodium bicarbonate on Class B fires.

Question 20: Which clean agent is most widely used as a replacement for Halon 1301 in fixed suppression systems?

FM-200 (HFC-227ea) (Correct answer)
AFFF foam
Nitrogen (IG-100)
CO2

Correct answer: FM-200 (HFC-227ea)

FM-200 (HFC-227ea) is the most widely used halon alternative for total-flooding applications because it has zero ozone depletion potential and extinguishes fires at low concentrations.

Question 21: Monoammonium phosphate (MAP), the active ingredient in ABC extinguishers, melts on contact with burning Class A materials. Why is this significant?

It increases the discharge range of the extinguisher
It lowers the burning point of ordinary combustibles
It absorbs moisture from the air to dilute combustion
It forms a vitreous coating that seals the fuel surface and prevents re-ignition (Correct answer)

Correct answer: It forms a vitreous coating that seals the fuel surface and prevents re-ignition

When MAP contacts hot Class A surfaces, it melts and forms a glassy (vitreous) coating that seals oxygen away from the fuel, which is why ABC extinguishers are effective on ordinary combustibles.

Question 22: What should an operator do if a fire is not extinguished after one full discharge of the extinguisher?

Try to smother the fire with a cloth
Continue to aim the empty extinguisher at the fire
Open windows to reduce smoke before re-attempting
Immediately evacuate — do not re-enter to try a second extinguisher unless trained and conditions are safe (Correct answer)

Correct answer: Immediately evacuate — do not re-enter to try a second extinguisher unless trained and conditions are safe

If a full discharge fails to extinguish the fire, the operator should evacuate immediately; a growing fire quickly becomes life-threatening.

Question 23: Sodium bicarbonate dry chemical is rated for use on which fire classes?

Class B and C fires only (Correct answer)
Class A and B fires only
Class D fires only
Class A, B, and C fires

Correct answer: Class B and C fires only

Sodium bicarbonate (ordinary dry chemical) is rated for Class B (flammable liquids) and Class C (energized electrical) fires but is not effective on Class A fires.

Question 24: What is the UL rating system used to communicate the firefighting capability of a portable extinguisher?

A color band indicating hazard class only
A letter-number rating (e.g., 2A:10B:C) where the number indicates extinguishing potential (Correct answer)
A weight-based code indicating agent mass
A numerical code indicating gallons of agent

Correct answer: A letter-number rating (e.g., 2A:10B:C) where the number indicates extinguishing potential

The UL rating uses a letter for fire class and a number (for A and B) representing comparative extinguishing potential on standardized test fires.

Question 25: After a fire extinguisher has been used partially, what is the correct action per NFPA 10?

Replace the pull pin and return to service
Return to service if gauge still reads in the green
Leave it in service until annual inspection
Recharge immediately regardless of how much agent was used (Correct answer)

Correct answer: Recharge immediately regardless of how much agent was used

NFPA 10 requires that any extinguisher that has been used, even partially, be recharged or replaced immediately.

Question 26: What is the primary reason clean agent (Halotron I, FM-200) extinguishers are preferred over CO2 for occupied server rooms?

Clean agents are effective at lower concentrations that are safer for occupants who may still be present (Correct answer)
Clean agents are cheaper than CO2
Clean agents leave less residue than CO2
Clean agents have a longer shelf life

Correct answer: Clean agents are effective at lower concentrations that are safer for occupants who may still be present

Clean agents suppress fires at concentrations below human safety thresholds, whereas CO2 at extinguishing concentrations is immediately dangerous to life.

Question 27: Under NFPA 10, how often must stored-pressure dry chemical extinguishers with stainless steel shells undergo hydrostatic testing?

Every 6 years
Every 5 years
Every 12 years (Correct answer)
Every 10 years

Correct answer: Every 12 years

Stored-pressure dry chemical extinguishers with stainless steel shells must be hydrostatically tested every 12 years per NFPA 10.

Question 28: What does the term 'agent suitability' mean when selecting a dry chemical extinguisher for a risk?

The agent must be the lowest cost option available for the hazard
The agent must meet the minimum UL rating regardless of residue or corrosion concerns
The agent's chemical properties must be compatible with the fire class and surrounding materials without causing additional hazards (Correct answer)
The agent must be stored at the same temperature as the protected area

Correct answer: The agent's chemical properties must be compatible with the fire class and surrounding materials without causing additional hazards

Agent suitability requires that the chosen extinguishing agent effectively suppresses the specific fire class present without creating incompatible reactions or collateral damage to the environment or materials.

Question 29: During a hazard survey, a technician notes that an extinguisher is mounted behind a frequently opened door. What risk does this create?

The extinguisher may be hidden from view, violating NFPA 10 visibility requirements (Correct answer)
Mounting behind doors is an acceptable alternate placement per NFPA 10
The door's movement could damage the extinguisher over time only
This is only a concern if the extinguisher is over 40 lbs in weight

Correct answer: The extinguisher may be hidden from view, violating NFPA 10 visibility requirements

NFPA 10 requires extinguishers to be visible; a unit hidden behind a door fails to meet this requirement and must be relocated or marked.

Question 30: What maximum permanent expansion percentage typically requires a cylinder to be condemned during hydrostatic testing?

10% (Correct answer)
5%
15%
2%

Correct answer: 10%

A cylinder exhibiting permanent expansion exceeding 10% of total expansion is typically condemned as structurally compromised.

Question 31: When assessing travel distance to a fire extinguisher for a Class B hazard, what is the maximum allowable travel distance per NFPA 10?

50 feet (Correct answer)
30 feet
100 feet
75 feet

Correct answer: 50 feet

NFPA 10 requires a maximum travel distance of 50 feet to extinguishers protecting Class B hazards.

Question 32: During hydrostatic testing, what condition in the test water indicates a cylinder must be condemned?

Slight bubbling during pressurization
Water turning slightly cloudy
Change in water temperature
Leakage, deformation, or failure to hold test pressure (Correct answer)

Correct answer: Leakage, deformation, or failure to hold test pressure

Any leakage, permanent deformation, or inability to hold the test pressure means the cylinder must be condemned and removed from service.

Question 33: Why must dry nitrogen (not CO2) be used to pressurize dry chemical stored-pressure extinguishers?

CO2 can react with the dry chemical agent and cause caking or loss of pressure (Correct answer)
CO2 is only available in liquid form
Nitrogen is heavier and provides more pressure
Nitrogen is cheaper than CO2

Correct answer: CO2 can react with the dry chemical agent and cause caking or loss of pressure

CO2 can react with moisture and dry chemical agents, potentially causing caking or pressure loss, so dry nitrogen is specified.

Question 34: Which component must be replaced during the 6-year maintenance of a stored-pressure dry chemical extinguisher?

The hose assembly
The cylinder shell
The pressure gauge
All seals, gaskets, and valve components subject to leakage (Correct answer)

Correct answer: All seals, gaskets, and valve components subject to leakage

The 6-year maintenance procedure requires removal and inspection of all internals, including replacement of all seals, gaskets, and O-rings.

Question 35: What does a fire extinguisher's pressure gauge indicate?

The pressure level of the extinguisher (Correct answer)
The amount of fire retardant left
The weight of the fire extinguisher
The time needed to discharge the extinguisher

Correct answer: The pressure level of the extinguisher

The pressure gauge on a fire extinguisher indicates the internal pressure of the propellant gas, which is crucial for expelling the extinguishing agent effectively. A gauge needle pointing to the green zone signifies that the extinguisher is properly charged and ready for immediate use. Regular checks of this gauge are vital for ensuring operational readiness.

Question 36: Which NFPA 10 requirement applies when a portable fire extinguisher is located where it may be subject to physical damage?

It must be inspected weekly instead of monthly
It must be upgraded to a wheeled extinguisher
It must be replaced with a larger unit
It must be protected by a suitable bracket, cabinet, or enclosure (Correct answer)

Correct answer: It must be protected by a suitable bracket, cabinet, or enclosure

NFPA 10 requires that extinguishers subject to physical damage be protected by a bracket, cabinet, or other suitable enclosure.

Question 37: What is the correct hydrostatic test pressure for a stored-pressure dry chemical extinguisher rated at a 195 psi service pressure?

195 psi
The test pressure is stamped on the cylinder and typically 1.5–2× service pressure (Correct answer)
250 psi
300 psi

Correct answer: The test pressure is stamped on the cylinder and typically 1.5–2× service pressure

The hydrostatic test pressure is stamped on the cylinder by the manufacturer and is typically 1.5 to 2 times the service pressure.

Question 38: Per NFPA 10, when must a fire extinguisher be removed from service for a six-year maintenance check?

Every 6 years from date of manufacture (Correct answer)
Every 6 years from date of installation
Every 6 years from date of last annual inspection
Every 6 years from date of last hydrostatic test

Correct answer: Every 6 years from date of manufacture

NFPA 10 requires the 6-year internal maintenance check to be performed every 6 years from the date of manufacture.

Question 39: What is the required hydrostatic test interval for CO2 fire extinguishers?

6 years
12 years
5 years (Correct answer)
10 years

Correct answer: 5 years

CO2 extinguishers must be hydrostatically tested every 5 years because they operate at very high pressure.

Question 40: When is it appropriate for a trained occupant to attempt to fight a fire with a portable extinguisher?

Only when the fire is small, confined, the alarm is activated, an exit is behind them, and they are trained (Correct answer)
Only professional firefighters should use extinguishers
Only when the sprinkler system has already activated
Always — extinguishers are provided for this purpose

Correct answer: Only when the fire is small, confined, the alarm is activated, an exit is behind them, and they are trained

Occupant use is appropriate only for small, incipient-stage fires when conditions are safe: alarm active, exit available, and the person is trained.

Question 41: What does a fire risk assessment identify regarding building features?

The number of fire extinguishers.
The budget for fire safety.
Exit points and fire-resistant materials (Correct answer)
The type of fire insurance coverage.

Correct answer: Exit points and fire-resistant materials

A fire risk assessment identifies crucial building features related to fire safety, such as exit points and fire-resistant materials. Exit points are evaluated to ensure clear and sufficient escape routes for occupants. Fire-resistant materials are assessed for their ability to compartmentalize fires and slow their spread, protecting both occupants and the structural integrity of the building.

Question 42: Which type of portable fire extinguisher requires internal examination at every 6-year interval?

Wet chemical extinguishers
Stored-pressure dry chemical extinguishers (Correct answer)
CO2 extinguishers
Halotron extinguishers

Correct answer: Stored-pressure dry chemical extinguishers

NFPA 10 requires a 6-year internal inspection of stored-pressure dry chemical extinguishers, coinciding with the 6-year maintenance service.

Question 43: What type of hydrostatic test method involves filling the cylinder with water, pressurizing it, and measuring permanent expansion?

Proof pressure test
Burst test
Pneumatic test
Water jacket test (Correct answer)

Correct answer: Water jacket test

The water jacket test measures total and permanent expansion by immersing the pressurized cylinder in a water-filled jacket and recording displaced water.

Question 44: How should a fire extinguisher be positioned in relation to potential hazards?

Inside the hazard area for fastest access
Along normal paths of travel and egress, near the hazard but not in it (Correct answer)
Directly over the hazard
Opposite side of the building from the hazard

Correct answer: Along normal paths of travel and egress, near the hazard but not in it

Extinguishers should be placed along normal paths of egress so occupants can grab them while evacuating without entering the hazard area.

Question 45: Which extinguisher agent works by forming a vapor-suppressing aqueous film over flammable liquid surfaces?

Sodium bicarbonate dry chemical
Purple-K (PKP)
Aqueous Film-Forming Foam (AFFF) (Correct answer)
Carbon dioxide

Correct answer: Aqueous Film-Forming Foam (AFFF)

AFFF creates an aqueous film that spreads across flammable liquid surfaces, cutting off oxygen and suppressing vapors.

Question 46: What is the purpose of the collar or label placed on a cylinder after hydrostatic testing?

To replace the annual inspection tag
To show the agent type
To indicate the extinguisher brand
To provide a permanent record of the test date, pressure, and tester identification on the cylinder (Correct answer)

Correct answer: To provide a permanent record of the test date, pressure, and tester identification on the cylinder

The hydrostatic test collar or label permanently records the test date, pressure used, and the identity of the testing facility directly on the cylinder.

Question 47: What action should a technician take if a fire extinguisher mounting bracket is damaged or missing?

Submit a report and wait for the next annual inspection
Replace the bracket immediately before returning the extinguisher to service (Correct answer)
Hang the extinguisher from its ring pin
Tag the extinguisher and leave it on the floor temporarily

Correct answer: Replace the bracket immediately before returning the extinguisher to service

A damaged or missing bracket must be replaced immediately to ensure the extinguisher is properly secured and accessible.

Question 48: What is the required hydrostatic test interval for a stored-pressure water-type fire extinguisher?

6 years
5 years (Correct answer)
10 years
12 years

Correct answer: 5 years

Stored-pressure water-type extinguishers must be hydrostatically tested every 5 years per NFPA 10.

Question 49: A fire in a propane storage area is best addressed with which type of extinguisher?

Water extinguisher
Class A water mist extinguisher
Class D dry powder extinguisher
Class B dry chemical (BC or ABC) extinguisher (Correct answer)

Correct answer: Class B dry chemical (BC or ABC) extinguisher

Propane is a flammable gas (Class B fuel), so a BC or ABC dry chemical extinguisher is the correct choice.

Question 50: Which fire extinguisher agent is recommended for a Class K commercial kitchen fire involving hot cooking oils?

CO2
Wet chemical (potassium acetate/citrate solution) (Correct answer)
ABC dry chemical
Water mist

Correct answer: Wet chemical (potassium acetate/citrate solution)

Wet chemical agents (Class K) are specifically designed for high-temperature cooking oil fires, creating a soap-like layer that cools and suppresses the fire.

Question 51: At what maximum height should the handle of a fire extinguisher be mounted if it weighs more than 40 pounds?

5 feet
3 feet (Correct answer)
3.5 feet
4 feet

Correct answer: 3 feet

NFPA 10 requires that extinguishers weighing more than 40 pounds be mounted so the handle is no higher than 3 feet (3.5 feet for those 40 lbs or less).

Question 52: Which action should be taken if a fire extinguisher has visible rust or corrosion?

Polish it to remove the rust.
Apply a coat of paint.
Clean it thoroughly.
Remove it from service and replace it (Correct answer)

Correct answer: Remove it from service and replace it

If a fire extinguisher has visible rust or corrosion, it indicates a compromise in the integrity of the cylinder, which can weaken the container and make it unsafe. A corroded extinguisher could fail under pressure, posing a significant hazard. Therefore, it must be immediately removed from service and replaced to ensure safety and compliance.

Question 53: Purple-K (PKP) dry chemical is known for being superior to standard sodium bicarbonate on flammable liquid fires because:

It is compatible with foam agents
It leaves no residue after use
It also provides Class A coverage
It has approximately twice the firefighting effectiveness on Class B fires (Correct answer)

Correct answer: It has approximately twice the firefighting effectiveness on Class B fires

Purple-K (potassium bicarbonate) is roughly twice as effective as sodium bicarbonate on a pound-for-pound basis for Class B flammable liquid fires.

Question 54: What is considered a major hazard during a fire risk assessment?

Flammable materials and faulty wiring (Correct answer)
Excessive use of electricity.
Lack of fire extinguishers.
Insufficient emergency exits.

Correct answer: Flammable materials and faulty wiring

During a fire risk assessment, flammable materials and faulty wiring are considered major hazards. Flammable materials provide the fuel for a fire, allowing it to start and spread rapidly. Faulty wiring is a common source of ignition due to overheating or arcing. Both represent direct and significant threats that require immediate attention to prevent fire incidents.

Question 55: What is the most important safety rule when using a CO2 extinguisher in a confined space?

Aim at the ceiling, not the base of the fire
Use only half the charge to avoid over-discharge
Turn off all lights before discharging
Evacuate the area immediately after use — CO2 displaces oxygen and creates an asphyxiation hazard (Correct answer)

Correct answer: Evacuate the area immediately after use — CO2 displaces oxygen and creates an asphyxiation hazard

CO2 displaces oxygen and in an enclosed space can cause unconsciousness or death; all personnel must evacuate immediately.

Question 56: When conducting a hazard assessment in a commercial laundry facility, which factor would most likely elevate the risk from ordinary to extra hazard?

Standard 120V electrical outlets throughout the facility
Use of non-flammable cleaning detergents
Large quantities of lint accumulation near heat sources (Correct answer)
Presence of employee lockers in the break room

Correct answer: Large quantities of lint accumulation near heat sources

Lint is highly combustible and accumulates rapidly near heat in laundry facilities, significantly increasing fire load and qualifying as extra hazard.

Question 57: NFPA 10 requires that extinguishers be conspicuously located. Which of the following BEST satisfies this requirement?

Stored in a locked utility room
Along normal paths of travel, including near exits (Correct answer)
Mounted behind equipment for proximity to hazards
Hidden inside cabinets to prevent tampering

Correct answer: Along normal paths of travel, including near exits

NFPA 10 mandates extinguishers be located along normal paths of travel and near exits so they can be accessed quickly.

Question 58: What interval is required for hydrostatic testing of a dry chemical stored-pressure extinguisher?

5 years
6 years
10 years
12 years (Correct answer)

Correct answer: 12 years

NFPA 10 requires hydrostatic testing of stored-pressure dry chemical extinguishers every 12 years.

Question 59: What is the maximum travel distance to a fire extinguisher for Class B flammable liquid hazards?

50 feet (Correct answer)
75 feet
100 feet
30 feet

Correct answer: 50 feet

NFPA 10 requires a maximum travel distance of 50 feet to a fire extinguisher for Class B hazards.

Question 60: A technician is assessing a warehouse that stores both cardboard boxes (ordinary combustibles) and pressurized propane cylinders. What is the primary hazard classification concern?

Class C only, since propane cylinders involve pressurized gas
Dual-hazard environment requiring both Class A and Class B coverage (Correct answer)
Class D, since propane is a compressed material
Class A only, since cardboard is the primary fuel load

Correct answer: Dual-hazard environment requiring both Class A and Class B coverage

Propane creates a Class B flammable gas hazard, and cardboard creates a Class A hazard, requiring coverage for both in the assessment.

Question 61: When is it acceptable to top off (add a small amount of agent) to a partially discharged dry chemical extinguisher instead of fully recharging it?

Never — partial discharge requires complete recharge (Correct answer)
When less than 10% of the agent was used
When the pressure gauge still reads green
When it would save the agency money

Correct answer: Never — partial discharge requires complete recharge

NFPA 10 does not permit topping off; any partial or full discharge requires a complete recharge with fresh agent.

Question 62: What does the pressure gauge on a stored-pressure extinguisher measure?

CO2 cartridge charge level
Weight of remaining agent
Ambient temperature
Internal pressure of the combined agent and propellant gas (Correct answer)

Correct answer: Internal pressure of the combined agent and propellant gas

The pressure gauge measures the internal pressure of the stored-pressure extinguisher, indicating whether it is properly charged.

Question 63: Which standard provides requirements for the design, performance, and testing of portable fire extinguishers for UL listing?

UL 711 (Correct answer)
UL 1093
UL 300
UL 299

Correct answer: UL 711

UL 711 is the standard that covers the rating and fire testing of portable fire extinguishers used for product listing.

Question 64: AFFF (Aqueous Film Forming Foam) extinguishers are specifically effective on which type of fire?

Class C electrical fires
Class B fires involving hydrocarbon fuels such as gasoline and aviation fuel (Correct answer)
Class A ordinary combustibles only
Class D metal fires

Correct answer: Class B fires involving hydrocarbon fuels such as gasoline and aviation fuel

AFFF creates an aqueous film over Class B hydrocarbon fuels that seals vapors and cools the fuel surface, suppressing the fire.

Question 65: What does the fire extinguisher's 'pass' inspection tag indicate?

The extinguisher is overcharged.
The extinguisher meets safety standards (Correct answer)
The extinguisher has been tested.
The extinguisher is ready to be used.

Correct answer: The extinguisher meets safety standards

A 'pass' inspection tag indicates that the fire extinguisher has undergone a thorough inspection and has been found to be in proper working condition, meeting all applicable safety standards and regulations. This tag confirms its readiness for use and compliance, providing assurance that it will function as intended in an emergency.

Question 66: Which of the following is a required step when performing the 6-year maintenance on a stored-pressure ABC dry chemical extinguisher?

Install an electronic pressure monitoring sensor
Hydrostatic test the cylinder at 6-year intervals simultaneously
Replace the entire extinguisher with a new unit if it is older than 12 years
Empty the extinguisher, inspect internals, replace all O-rings and gaskets, and refill with fresh agent (Correct answer)

Correct answer: Empty the extinguisher, inspect internals, replace all O-rings and gaskets, and refill with fresh agent

The 6-year maintenance requires complete emptying, internal inspection, replacement of all seals and O-rings, and refill with fresh agent to the rated fill weight.

Question 67: A hazard assessment identifies a computer server room as the primary risk area. Which type of extinguisher is most appropriate to specify?

Dry chemical (ABC) extinguisher
Water extinguisher
Foam extinguisher
Clean agent or CO2 extinguisher (Correct answer)

Correct answer: Clean agent or CO2 extinguisher

Clean agent or CO2 extinguishers are preferred in server rooms to avoid damaging sensitive electronics.

Question 68: Per NFPA 10, a stored-pressure water extinguisher requires hydrostatic testing every:

3 years
5 years (Correct answer)
6 years
10 years

Correct answer: 5 years

Stored-pressure water and water-mist extinguishers must be hydrostatically tested every 5 years per NFPA 10.

Question 69: Which factor is NOT typically used to determine the required number and placement of fire extinguishers?

Nature of the fire hazard
Size of the area to be protected
Travel distance limitations
Color of the building interior (Correct answer)

Correct answer: Color of the building interior

Interior color has no bearing on extinguisher placement; hazard class, area size, and travel distance are the determining factors.

Question 70: Which standard governs the installation and placement of portable fire extinguishers in the United States?

ANSI Z535
OSHA 1910.157
NFPA 72
NFPA 10 (Correct answer)

Correct answer: NFPA 10

NFPA 10, Standard for Portable Fire Extinguishers, is the primary document governing installation and placement.

Question 71: Which of the following is NOT a standard for fire extinguisher inspection?

Inspect for visible damage.
Check the nozzle for blockages.
Ensure the extinguisher is fully charged.
Test the fire extinguisher on a live fire (Correct answer)

Correct answer: Test the fire extinguisher on a live fire

Testing a fire extinguisher on a live fire is not a standard procedure for inspection; it is an actual use of the extinguisher that would require it to be recharged afterward. Standard inspections involve visual checks for damage, proper pressure, clear nozzles, and ensuring the unit is fully charged, without discharging its contents.

Question 72: What is the maximum floor area per extinguisher for a light-hazard Class A occupancy under NFPA 10?

11,250 sq ft (Correct answer)
10,000 sq ft
6,000 sq ft
3,000 sq ft

Correct answer: 11,250 sq ft

For light-hazard occupancies, NFPA 10 allows a maximum coverage area of 11,250 square feet per extinguisher for Class A hazards.

Question 73: A risk assessment identifies a mixed-hazard environment containing both flammable liquids and ordinary combustibles. What extinguisher rating is most suitable?

BC-rated CO2 extinguisher
D-rated dry powder extinguisher
A-rated water extinguisher
ABC-rated dry chemical extinguisher (Correct answer)

Correct answer: ABC-rated dry chemical extinguisher

An ABC-rated dry chemical extinguisher is effective against ordinary combustibles (A), flammable liquids (B), and electrical hazards (C).

Question 74: A technician is reviewing a facility with a combination of natural gas heating equipment and ordinary office combustibles. What is the minimum hazard assessment scope required?

Only Class A since office materials are the dominant fuel source
Class A for office areas and Class B for gas equipment areas, assessed separately (Correct answer)
Class C only because all heating systems involve energized components
Only Class B since gas represents the most severe hazard

Correct answer: Class A for office areas and Class B for gas equipment areas, assessed separately

NFPA 10 requires each hazard type and zone to be assessed individually; office areas need Class A coverage and gas equipment areas need Class B coverage.

Question 75: When recharging a dry chemical extinguisher, what must always be done before applying nitrogen pressure?

Verify the valve stem O-ring is seated and the fill cap is secure (Correct answer)
Heat the cylinder to 70°F
Weigh the empty cylinder only
Paint the cylinder with current date

Correct answer: Verify the valve stem O-ring is seated and the fill cap is secure

Before pressurizing, the technician must confirm all seals and caps are properly seated to prevent dangerous gas leakage or ejection.

Question 76: Which item on an extinguisher's nameplate is used to identify the specific unit for record-keeping purposes?

Manufacturer's logo
Serial number (Correct answer)
Agent type color code
Net agent weight

Correct answer: Serial number

The serial number is the unique identifier for each extinguisher and is used to link the unit to all of its service records.

Question 77: The 'saponification' reaction relevant to Class K extinguisher agents describes which chemical process?

Hydrolysis of foam concentrate in water
Alkaline solution reacting with fatty acid oils to form soap and glycerol (Correct answer)
Oxidation of potassium ions releasing heat
Reduction of CO2 at high cooking temperatures

Correct answer: Alkaline solution reacting with fatty acid oils to form soap and glycerol

Saponification is the reaction between the alkaline wet chemical agent and the fatty acid cooking oils to form a soap-like emulsion that blankets the surface and prevents vapor release.

Question 78: What is the primary advantage of using a Class K fire extinguisher?

They are ideal for electrical fires.
They are used for wood and paper fires.
They are suitable for metal fires.
They are effective on grease fires (Correct answer)

Correct answer: They are effective on grease fires

Class K fire extinguishers are specifically designed for fires involving cooking oils and fats (grease fires) commonly found in commercial kitchens. They use a wet chemical agent that creates a foam blanket, cooling the fuel and preventing reignition. This makes them highly effective and safe for these specific types of fires.

Question 79: Which type of extinguisher is most appropriate for a printing facility with large quantities of paper (Class A) and ink solvents (Class B)?

Class D powder extinguisher
CO2 extinguisher only
ABC multipurpose dry chemical extinguisher (Correct answer)
Water-only extinguisher

Correct answer: ABC multipurpose dry chemical extinguisher

ABC multipurpose dry chemical addresses both Class A (paper) and Class B (solvent) hazards, making it the correct choice for mixed-hazard facilities.

Question 80: Under NFPA 10, what information must appear on the inspection tag attached to a fire extinguisher?

Hydrostatic test due date only
Date of inspection and initials or identity of the inspector (Correct answer)
Serial number and manufacturer name only
Type of extinguishing agent only

Correct answer: Date of inspection and initials or identity of the inspector

NFPA 10 requires the inspection tag to show the date and the identity of the person performing the inspection.

Question 81: According to NFPA 10, what is the maximum travel distance to a fire extinguisher for Class A hazards in a light-hazard occupancy?

50 feet
125 feet
100 feet
75 feet (Correct answer)

Correct answer: 75 feet

NFPA 10 specifies a maximum travel distance of 75 feet to a fire extinguisher for Class A hazards in light-hazard occupancies.

Question 82: When should fire extinguisher location signs be used?

Only in buildings over two stories
Only in industrial occupancies
Only when required by the local AHJ
Whenever the extinguisher is not readily visible from normal approaches (Correct answer)

Correct answer: Whenever the extinguisher is not readily visible from normal approaches

Location signs are required whenever the extinguisher is not immediately visible from normal approaches to the area.

Question 83: Which extinguishing agent is specifically recommended for Class K fires involving cooking oils and fats in commercial kitchens?

ABC dry chemical powder
AFFF aqueous film-forming foam
Wet chemical potassium acetate solution (Correct answer)
Carbon dioxide (CO2)

Correct answer: Wet chemical potassium acetate solution

Wet chemical agents (potassium acetate, potassium carbonate, or potassium citrate) are designed for Class K fires because they react with hot cooking oils to form a soapy foam layer via saponification.

Question 84: Which organization's certification is most widely recognized in the US for portable fire extinguisher service technicians?

NFPA
ICC (International Code Council)
NICET (National Institute for Certification in Engineering Technologies) (Correct answer)
OSHA

Correct answer: NICET (National Institute for Certification in Engineering Technologies)

NICET offers widely recognized certification for fire protection technicians, including portable fire extinguisher servicing.

Question 85: Multipurpose dry chemical (ABC) extinguishers use which primary agent?

Potassium chloride
Potassium bicarbonate
Monoammonium phosphate (Correct answer)
Sodium bicarbonate

Correct answer: Monoammonium phosphate

Monoammonium phosphate is the agent in multipurpose ABC dry chemical extinguishers because it is effective on Class A, B, and C fires.

Question 86: Per NFPA 10, what is the frequency required for the inspection of portable fire extinguishers?

Quarterly
Every six months
At least monthly (Correct answer)
Weekly

Correct answer: At least monthly

NFPA 10 requires portable fire extinguishers to be inspected at least monthly, though more frequent inspections are permitted.

Question 87: Under NFPA 10, what is the maximum travel distance to reach a Class B extinguisher in an area with a 'flammable liquid' hazard rating?

100 feet
75 feet
50 feet (Correct answer)
30 feet

Correct answer: 50 feet

For extra hazard Class B occupancies, NFPA 10 sets a maximum travel distance of 50 feet to the nearest suitable extinguisher.

Question 88: Carbon dioxide (CO2) extinguishes fires primarily by which two mechanisms?

Chemical chain interruption and fuel removal
Saponification and smothering
Oxygen displacement and cooling (Correct answer)
Emulsification and dilution

Correct answer: Oxygen displacement and cooling

CO2 extinguishes fire by displacing oxygen (smothering) and by absorbing heat energy, providing a cooling effect on the burning material.

Question 89: After recharging a wet chemical (Class K) extinguisher, what must the technician verify before returning it to service?

That the label matches the previous label exactly
That the agent is blue in color
That agent level, pressure, and nozzle condition all meet manufacturer specifications (Correct answer)
That the cylinder is warm to the touch

Correct answer: That agent level, pressure, and nozzle condition all meet manufacturer specifications

Before returning a recharged wet chemical extinguisher to service, the technician must verify correct agent fill level, proper pressure, and clean nozzle condition.

Question 90: Which of the following is a primary responsibility of fire safety regulations?

Limit the use of fire extinguishers.
Provide fire insurance coverage.
Regulate the fire department's activities.
Ensure proper emergency exits and alarm systems are in place (Correct answer)

Correct answer: Ensure proper emergency exits and alarm systems are in place

A primary responsibility of fire safety regulations is to ensure proper emergency exits and alarm systems are in place. These regulations aim to protect human life and property by mandating essential safety features that facilitate safe evacuation and early fire detection. This proactive approach is fundamental to minimizing harm during a fire incident.

Question 91: What is the primary reason dry chemical extinguishing agents can cause corrosion damage to metals and sensitive electronics?

They leave alkaline residues that generate hydrogen gas
They absorb moisture from the air and form corrosive solutions after discharge (Correct answer)
They react with oxygen to produce metal oxides on surfaces
They contain acidic compounds that etch metal surfaces at high temperatures

Correct answer: They absorb moisture from the air and form corrosive solutions after discharge

After discharge, dry chemical powders are hygroscopic and absorb moisture from the air, forming corrosive compounds (e.g., carbonic acid from sodium bicarbonate) that attack metals and electronics.

Question 92: A cooking appliance fire involving burning vegetable oil in a deep fryer is classified as:

Class B
Class F
Class K (Correct answer)
Class A

Correct answer: Class K

In the US, fires involving cooking oils and fats in commercial cooking equipment are classified as Class K.

Question 93: Which agent is specifically designed for use on fires involving flammable metals such as sodium, potassium, and titanium?

Purple-K dry chemical
Class D dry powder (e.g., sodium chloride, graphite-based) (Correct answer)
AFFF foam
Carbon dioxide (CO2)

Correct answer: Class D dry powder (e.g., sodium chloride, graphite-based)

Class D dry powder agents like sodium chloride or graphite-based compounds are specifically formulated for combustible metal fires.

Question 94: A hazard assessment of a parking garage identifies vehicle fuel leaks as the primary risk. Which hazard class applies and what agent is recommended?

Class B hazard; dry chemical or CO2 extinguisher (Correct answer)
Class D hazard; dry powder extinguisher
Class A hazard; water extinguisher
Class C hazard; clean agent extinguisher

Correct answer: Class B hazard; dry chemical or CO2 extinguisher

Gasoline and vehicle fluids are Class B flammable liquid hazards, best addressed with dry chemical or CO2 extinguishers.

Question 95: Under NFPA 10, where must a signed and dated record of each fire extinguisher maintenance be kept?

On a tag or label attached to the extinguisher, in a file, or in an electronic system (Correct answer)
Only in the service technician's records
Only in the building owner's central file
Only on the extinguisher tag

Correct answer: On a tag or label attached to the extinguisher, in a file, or in an electronic system

NFPA 10 allows maintenance records to be kept on the extinguisher tag, in a paper file, or in an electronic record-keeping system.

Question 96: When assessing a multi-story building, how should hazard identification be conducted on different floors?

Only the ground floor needs assessment since it has the highest foot traffic
Each floor must be independently assessed based on its specific occupancy and activities (Correct answer)
Only floors with identified Class B hazards require individual assessments
One assessment for the entire building is sufficient if the use is consistent

Correct answer: Each floor must be independently assessed based on its specific occupancy and activities

Each floor may have different occupancies, fuel loads, and activities, so NFPA 10 requires each area to be independently evaluated.

Question 97: What is the correct pressure range for charging a standard ABC stored-pressure dry chemical extinguisher?

200–250 psi
125–175 psi (Correct answer)
100–125 psi
75–100 psi

Correct answer: 125–175 psi

Standard ABC stored-pressure dry chemical extinguishers are typically charged to 125–175 psi with dry nitrogen as specified by the manufacturer.

Question 98: NFPA 10 defines 'maintenance' of a fire extinguisher as:

The hydrostatic pressure testing of the cylinder
A thorough examination and repair of the extinguisher (Correct answer)
A quick visual check of the extinguisher's condition
The recharging of the extinguishing agent

Correct answer: A thorough examination and repair of the extinguisher

Maintenance per NFPA 10 is a thorough examination to ensure the extinguisher is fully charged, operable, and in good condition.

Question 99: Which action is specifically prohibited when reassembling a dry chemical extinguisher after maintenance?

Purging moisture with dry nitrogen before closing
Lubricating O-rings with petroleum-based grease (Correct answer)
Tightening the valve stem to manufacturer torque specification
Using Teflon tape on valve threads

Correct answer: Lubricating O-rings with petroleum-based grease

Petroleum-based lubricants degrade rubber O-rings and seals; only manufacturer-approved silicone or compatible lubricants may be used.

Question 100: Which of the following extinguisher types operates without any stored propellant pressure, relying instead on a chemical reaction to generate gas upon activation?

CO2 extinguisher
Stored-pressure water extinguisher
Cartridge-operated dry chemical extinguisher
Pump-tank water extinguisher (Correct answer)

Correct answer: Pump-tank water extinguisher

Pump-tank extinguishers have no stored pressure; the user manually pumps to generate discharge pressure at the time of use.

ICC/NAFED Certified Portable Fire Extinguisher Technician (FE)

The FE certification exam tests technicians on the inspection, maintenance, hydrostatic testing, recharging, placement, and recordkeeping of portable fire extinguishers in accordance with NFPA 10 and manufacturer specifications.

100

Questions

120 min

Time Limit

75%

To Pass

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