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Question 1. Which component of the fire tetrahedron, if removed, will immediately stop a fire? A) Fuel B) Heat C) Oxygen D) All of the above Answer: D Explanation: Removing any one of the three elements—fuel, heat, or oxygen —breaks the fire triangle (tetrahedron) and extinguishes the fire. Question 2. Class A fires are best extinguished by agents that primarily work through which mechanism? A) Smothering B) Cooling C) Chemical chain-reaction interruption D) Saponification Answer: B Explanation: Class A fires involve ordinary combustibles; water or other cooling agents absorb heat, reducing the temperature below the ignition point. Question 3. Which fire class involves energized electrical equipment? A) Class A B) Class B C) Class C
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D) Class D Answer: C Explanation: Class C fires are electrical; non-conductive extinguishing agents prevent shock hazards. Question 4. A fire involving magnesium is classified as: A) Class A B) Class B C) Class C D) Class D Answer: D Explanation: Class D fires involve combustible metals such as magnesium, titanium, and sodium. Question 5. Which extinguishing agent works by saponification? A) Water B) CO₂ C) Wet chemical (K-type) D) Dry chemical Answer: C Explanation: Wet-chemical agents react with cooking oils to form a soap-like foam, a process called saponification.
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Answer: B Explanation: NFPA 10 specifies a 50-foot maximum travel distance for Class B extinguishers in ordinary-hazard occupancies. Question 9. Which rating format correctly describes an extinguisher that can extinguish 2 lb of Class A material and 10 ft² of Class B liquid? A) 2-A:10-B B) 2-A:10-B:C C) 2-A/10-B D) 2A-10B Answer: A Explanation: The “2-A:10-B” notation indicates the equivalent extinguishing capacity for Class A and Class B fires. Question 10. For a high-hazard (extra) environment, the minimum required rating for a Class A extinguisher is: A) 2-A B) 4-A C) 8-A D) 10-A Answer: C Explanation: Extra-hazard areas require at least an 8-A rating for Class A extinguishers per NFPA 10.
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Question 11. Which of the following is the correct mounting height for a portable extinguisher in a public area? A) 24 in. to 48 in. above the floor B) 48 in. to 72 in. above the floor C) 12 in. to 24 in. above the floor D) 72 in. to 96 in. above the floor Answer: B Explanation: NFPA 10 recommends mounting extinguishers 48–72 in. above the floor for easy reach. Question 12. A “light-hazard” (low-hazard) occupancy typically requires which minimum travel distance to a Class A extinguisher? A) 30 ft B) 45 ft C) 75 ft D) 100 ft Answer: C Explanation: In light-hazard areas, the maximum travel distance to a Class A extinguisher is 75 ft. Question 13. Which PPE item is essential when handling a pressurized CO₂ extinguisher? A) Flame-resistant gloves B) Face shield C) Ear protection D) All of the above
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Question 16. Which of the following fire-extinguishing mechanisms is NOT typically associated with dry-chemical agents? A) Smothering B) Cooling C) Chain-reaction interruption D) Saponification Answer: D Explanation: Dry chemicals interrupt the chemical chain reaction; saponification is specific to wet-chemical (K-type) agents. Question 17. A “stored-pressure” dry-chemical extinguisher requires an internal inspection at what interval? A) Every 1 year B) Every 3 years C) Every 6 years D) Every 12 years Answer: B Explanation: NFPA 10 mandates a 3-year internal examination for stored-pressure dry-chemical extinguishers. Question 18. Which of the following is a prohibited type of fire extinguisher under most state codes? A) Water-mist B) Soda-acid (inverted)
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C) CO₂
D) ABC dry chemical Answer: B Explanation: Soda-acid (inverted) extinguishers are obsolete and prohibited because of reliability concerns. Question 19. The primary purpose of a “verification of service” ring on a recharged extinguisher is to: A) Indicate the type of extinguishing agent used B) Show that the extinguisher has passed hydrostatic testing C) Provide a visual cue that the unit has been serviced after discharge D) Identify the manufacturer Answer: C Explanation: The service ring is placed after a successful re-charge, indicating the unit is ready for service. Question 20. When recharging a nitrogen-pressurized extinguisher, the correct procedure is to: A) Fill the cylinder with liquid nitrogen B) Pressurize the cylinder to the specified gauge pressure using gaseous nitrogen C) Use compressed air as a substitute for nitrogen D) Heat the cylinder before adding nitrogen Answer: B
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A) Expansion of 0.1 in. beyond the allowable limit B) Minor surface rust that does not affect thickness C) Pitting deeper than 0.03 in. on the cylinder wall D) Slight discoloration near the valve Answer: C Explanation: Pitting beyond the permissible depth compromises structural integrity and leads to condemnation. Question 24. What information must be permanently stamped on a cylinder after a successful hydrostatic test? A) Date of test and next test due date B) Manufacturer’s name only C) The weight of the extinguishing agent D) The inspector’s license number Answer: A Explanation: The stamp must include the test date and the next test due date to track compliance. Question 25. Under state law, an individual who performs fire-extinguisher inspections must hold which credential? A) General contractor license B) Certified fire protection specialist (CFPS) or equivalent state-issued certification C) OSHA 10-hour certification only D) No specific credential is required
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Answer: B Explanation: Most states require inspectors to be certified by the state fire marshal or hold an equivalent fire-protection specialist license. Question 26. Which of the following best describes the “chain-reaction interruption” mechanism? A) Removing heat from the fire B) Blocking oxygen supply C) Chemically neutralizing the free radicals that sustain combustion D) Forming a foam blanket over the fire Answer: C Explanation: Certain agents (e.g., halon, dry chemicals) interrupt the radical chain reaction that maintains combustion. Question 27. A fire extinguisher label reads “2-A:10-B:C”. Which class of fire does the “C” indicate? A) Class A – ordinary combustibles B) Class B – flammable liquids C) Class C – energized electrical equipment D) Class D – combustible metals Answer: C Explanation: The “C” denotes that the extinguisher is also rated for Class C fires. Question 28. The correct orientation for the instruction placard on a wall-mounted extinguisher is:
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Answer: C Explanation: A low reading indicates loss of pressure; the extinguisher must be taken out of service and recharged. Question 31. Which fire-extinguishing agent is specifically designed for Class K (cooking-oil) fires? A) Water mist B) Carbon dioxide C) Wet chemical (potassium acetate) D) Sodium bicarbonate Answer: C Explanation: Wet-chemical agents (often potassium acetate) saponify cooking oils, making them effective for Class K fires. Question 32. The “travel distance” requirement for a Class A extinguisher in an extra-hazard environment is: A) 30 ft B) 45 ft C) 75 ft D) 100 ft Answer: D Explanation: Extra-hazard (high-hazard) occupancies may require up to 100 ft travel distance for Class A extinguishers. Question 33. Which of the following is a key visual sign of corrosion on a fire-extinguisher cylinder?
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A) A faint odor of chemicals B) Blue discoloration on the valve stem C) Rust streaks or pitting on the metal surface D) A slightly loose pull-pin Answer: C Explanation: Corrosion appears as rust or pitting, weakening the cylinder wall. Question 34. In a laboratory handling flammable solvents, the most appropriate extinguisher type is: A) Water B) CO₂ C) Foam D) Dry chemical (ABC) Answer: B Explanation: CO₂ is non-conductive, leaves no residue, and is suitable for solvent fires without damaging equipment. Question 35. Which of the following statements about “tamper seals” is correct? A) They must be replaced after every inspection, even if intact B) They are optional for Class K extinguishers only C) A broken seal indicates the unit may have been used or opened D) They are made of metal and cannot be broken
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B) Using a calibrated scale to weigh the cylinder before and after filling C) Measuring the pressure gauge reading D) Counting the number of pellets in the nozzle Answer: B Explanation: Weighing the cylinder before and after adding the agent ensures the correct quantity has been loaded. Question 39. A fire-extinguisher inspection tag must include all EXCEPT: A) Date of inspection B) Name of the inspector C) The extinguisher’s serial number D) The inspector’s personal phone number Answer: D Explanation: Personal phone numbers are not required; the tag records date, inspector, and unit identification. Question 40. Which of the following fire-extinguisher types is prohibited for use on Class D metal fires? A) Dry powder (sodium chloride) B) Water mist C) Copper-based powder D) Sodium bicarbonate Answer: B
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Explanation: Water can react violently with combustible metals; it is prohibited for Class D fires. Question 41. The term “saponification” refers to which chemical process? A) Oxidation of metal surfaces B) Conversion of fats into soap by alkaline agents C) Decomposition of halogenated gases D) Polymerization of dry-chemical powders Answer: B Explanation: In wet-chemical extinguishers, the alkaline agent reacts with cooking oils to form a soap-like foam. Question 42. When a fire-extinguisher’s pull-pin is missing, the correct action is: A) Replace the pin and continue using the unit B) Tag the extinguisher as “Out of Service” and arrange replacement C) Re-pressurize the extinguisher on site D) No action needed if the gauge reads “In-Range” Answer: B Explanation: A missing pull-pin compromises readiness; the unit must be taken out of service. Question 43. Which of the following is a correct statement about “hydrostatic testing”? A) It measures the chemical composition of the extinguishing agent
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Answer: C Explanation: Over-charging occurs when the cylinder is pressurized beyond its design limit during refilling. Question 46. Which fire-extinguishing agent is the best choice for a Class B fire involving gasoline? A) Water B) Foam C) CO₂ D) Wet chemical Answer: B Explanation: Foam forms a blanket that smothers gasoline fires and prevents re-ignition. Question 47. In a state that has adopted NFPA 10, the “verification of service” ring must be placed on which part of the extinguisher? A) The nozzle B) The valve stem C) The pressure gauge D) The handle Answer: B Explanation: The service ring is placed on the valve stem after a successful recharge. Question 48. Which of the following statements about “light-hazard” (low-hazard) areas is FALSE?
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A) They require the shortest travel distances for extinguishers B) They typically contain small amounts of combustible material C) They may have a higher extinguisher rating than ordinary-hazard areas D) They generally have lower fire-risk classifications Answer: C Explanation: Light-hazard areas usually require lower-rated extinguishers, not higher. Question 49. What is the primary reason for placing fire-extinguisher signage at eye level? A) To meet aesthetic standards B) To ensure the sign is not damaged by cleaning equipment C) To make it readily visible to occupants in an emergency D) To comply with OSHA noise-reduction guidelines Answer: C Explanation: Visibility at eye level helps occupants quickly locate extinguishers during an emergency. Question 50. Which of the following extinguishers is specifically designed to be safe for use on electrical panel fires without causing damage to the equipment? A) Water mist B) CO₂ C) ABC dry chemical D) Foam
