Fe – Certified Portable Fire Extinguisher Technician
Main Exam Practice Questions: Questions with Answers and
Rationales for guaranteed success
Topics: fire science and classes, extinguisher types and agents,
ratings and placement, inspection, maintenance, recharge,
hydrostatic testing, and safety (based on NFPA 10 principles)
1. Which four elements make up the fire tetrahedron?
A. Heat, fuel, nitrogen and pressure
B. Fuel, oxygen, water and spark
C. Heat, fuel, oxygen and an uninhibited chemical chain
reaction
D. Heat, oxygen, carbon dioxide and fuel
Correct Answer: C. Heat, fuel, oxygen and an uninhibited
chemical chain reaction
Rationale: The tetrahedron adds the self-sustaining chemical
chain reaction to the fire triangle (heat, fuel, oxygen). Removing
any one element extinguishes the fire.
2. A fire involving wood, paper, cloth and rubber is classified
as:
A. Class B
B. Class C
C. Class D
D. Class A
Correct Answer: D. Class A
Rationale: Class A fires involve ordinary combustible solids that
leave ash and embers.
,3. A fire involving gasoline, oil-based paint or flammable
gases is classified as:
A. Class A
B. Class D
C. Class K
D. Class B
Correct Answer: D. Class B
Rationale: Class B covers flammable and combustible liquids
and gases.
4. A fire involving energized electrical equipment is classified
as:
A. Class A
B. Class B
C. Class C
D. Class K
Correct Answer: C. Class C
Rationale: Class C fires involve energized electrical equipment,
so the agent used must be electrically nonconductive. Once de-
energized, the fire is treated as Class A or B.
5. Magnesium, titanium and sodium fires are classified as:
A. Class D
B. Class B
C. Class C
D. Class K
Correct Answer: A. Class D
Rationale: Class D fires involve combustible metals and require
special dry powder agents.
,6. Which class of fire involves cooking oils and fats in
commercial kitchens?
A. Class A
B. Class B
C. Class D
D. Class K
Correct Answer: D. Class K
Rationale: Class K (Class F in some countries) covers vegetable
and animal oils and fats in cooking appliances.
7. The primary extinguishing action of water on a Class A fire
is:
A. Interrupting the chain reaction
B. Displacing all oxygen in the room
C. Removing the fuel
D. Cooling the fuel below its ignition temperature
Correct Answer: D. Cooling the fuel below its ignition
temperature
Rationale: Water absorbs large amounts of heat, cooling the
burning material.
8. Dry chemical agents primarily extinguish fire by:
A. Interrupting the chemical chain reaction
B. Cooling the fuel only
C. Starving the fire of fuel
D. Diluting nitrogen in the air
Correct Answer: A. Interrupting the chemical chain reaction
Rationale: The fine powder particles interrupt the combustion
chain reaction; ABC agents also smother Class A fires with a
molten coating.
, 9. Carbon dioxide extinguishes fire mainly by:
A. Interrupting the chain reaction
B. Leaving a residue that coats fuel
C. Displacing oxygen (smothering) and cooling
D. Dissolving the fuel vapor
Correct Answer: C. Displacing oxygen (smothering) and
cooling
Rationale: CO2 is a clean, nonconductive gas that reduces
oxygen concentration around the fuel and provides some cooling.
10. What does the acronym PASS stand for when operating
an extinguisher?
A. Pull, Aim, Squeeze, Sweep
B. Point, Alert, Spray, Stop
C. Pull, Alert, Spray, Stand
D. Push, Aim, Squeeze, Step back
Correct Answer: A. Pull, Aim, Squeeze, Sweep
Rationale: Pull the pin, aim the nozzle at the base of the fire,
squeeze the handle and sweep side to side.
11. A standard pressurized water extinguisher is suitable for
which class of fire?
A. Class A and B
B. Class B and C
C. Class K only
D. Class A only
Correct Answer: D. Class A only
Rationale: Water conducts electricity and spreads flammable
liquids, so it is used only on ordinary combustibles.
Main Exam Practice Questions: Questions with Answers and
Rationales for guaranteed success
Topics: fire science and classes, extinguisher types and agents,
ratings and placement, inspection, maintenance, recharge,
hydrostatic testing, and safety (based on NFPA 10 principles)
1. Which four elements make up the fire tetrahedron?
A. Heat, fuel, nitrogen and pressure
B. Fuel, oxygen, water and spark
C. Heat, fuel, oxygen and an uninhibited chemical chain
reaction
D. Heat, oxygen, carbon dioxide and fuel
Correct Answer: C. Heat, fuel, oxygen and an uninhibited
chemical chain reaction
Rationale: The tetrahedron adds the self-sustaining chemical
chain reaction to the fire triangle (heat, fuel, oxygen). Removing
any one element extinguishes the fire.
2. A fire involving wood, paper, cloth and rubber is classified
as:
A. Class B
B. Class C
C. Class D
D. Class A
Correct Answer: D. Class A
Rationale: Class A fires involve ordinary combustible solids that
leave ash and embers.
,3. A fire involving gasoline, oil-based paint or flammable
gases is classified as:
A. Class A
B. Class D
C. Class K
D. Class B
Correct Answer: D. Class B
Rationale: Class B covers flammable and combustible liquids
and gases.
4. A fire involving energized electrical equipment is classified
as:
A. Class A
B. Class B
C. Class C
D. Class K
Correct Answer: C. Class C
Rationale: Class C fires involve energized electrical equipment,
so the agent used must be electrically nonconductive. Once de-
energized, the fire is treated as Class A or B.
5. Magnesium, titanium and sodium fires are classified as:
A. Class D
B. Class B
C. Class C
D. Class K
Correct Answer: A. Class D
Rationale: Class D fires involve combustible metals and require
special dry powder agents.
,6. Which class of fire involves cooking oils and fats in
commercial kitchens?
A. Class A
B. Class B
C. Class D
D. Class K
Correct Answer: D. Class K
Rationale: Class K (Class F in some countries) covers vegetable
and animal oils and fats in cooking appliances.
7. The primary extinguishing action of water on a Class A fire
is:
A. Interrupting the chain reaction
B. Displacing all oxygen in the room
C. Removing the fuel
D. Cooling the fuel below its ignition temperature
Correct Answer: D. Cooling the fuel below its ignition
temperature
Rationale: Water absorbs large amounts of heat, cooling the
burning material.
8. Dry chemical agents primarily extinguish fire by:
A. Interrupting the chemical chain reaction
B. Cooling the fuel only
C. Starving the fire of fuel
D. Diluting nitrogen in the air
Correct Answer: A. Interrupting the chemical chain reaction
Rationale: The fine powder particles interrupt the combustion
chain reaction; ABC agents also smother Class A fires with a
molten coating.
, 9. Carbon dioxide extinguishes fire mainly by:
A. Interrupting the chain reaction
B. Leaving a residue that coats fuel
C. Displacing oxygen (smothering) and cooling
D. Dissolving the fuel vapor
Correct Answer: C. Displacing oxygen (smothering) and
cooling
Rationale: CO2 is a clean, nonconductive gas that reduces
oxygen concentration around the fuel and provides some cooling.
10. What does the acronym PASS stand for when operating
an extinguisher?
A. Pull, Aim, Squeeze, Sweep
B. Point, Alert, Spray, Stop
C. Pull, Alert, Spray, Stand
D. Push, Aim, Squeeze, Step back
Correct Answer: A. Pull, Aim, Squeeze, Sweep
Rationale: Pull the pin, aim the nozzle at the base of the fire,
squeeze the handle and sweep side to side.
11. A standard pressurized water extinguisher is suitable for
which class of fire?
A. Class A and B
B. Class B and C
C. Class K only
D. Class A only
Correct Answer: D. Class A only
Rationale: Water conducts electricity and spreads flammable
liquids, so it is used only on ordinary combustibles.
