IFSTA CHAPTER 6: PORTABLE FIRE
EXTINGUISHERS (LATEST 2026/ 2027
UPDATE) QUESTIONS AND 100%
CORRECT VERIFIED ANSWERS| GRADE
A+
1. Which classification of fire involves energized electrical equipment where the electrical
nonconductivity of the extinguishing agent is of importance?
A. Class C
B. Class B
C. Class A
D. Class D
Answer: A
Conceptual Explanation: Class C fires involve energized electrical equipment. The
extinguishing agent must not conduct electricity to protect the operator.
2. What is the numerical rating for a Class A extinguisher based on?
A. The square footage of the fire it can extinguish
B. The amount of water and the duration of discharge
C. The number of gallons of water, with 1-A equal to 1.25 gallons
,D. The weight of the extinguishing agent
Answer: C
Conceptual Explanation: A 1-A rating is equivalent to the extinguishing capability of 1.25
gallons of water. A 2-A rating would be 2.5 gallons.
3. Saponification is a process associated with which class of fire?
A. Class B
B. Class D
C. Class A
D. Class K
Answer: D
Conceptual Explanation: Saponification occurs when wet chemical agents react with
animal or vegetable oils in Class K fires to create a soapy foam that smothers the fire.
4. Which extinguishing agent works primarily by interrupting the chemical chain reaction?
A. Water
B. Dry Chemical
C. Carbon Dioxide
D. Aqueous Film Forming Foam (AFFF)
Answer: B
, Conceptual Explanation: Dry chemical agents like monoammonium phosphate interfere
with the combustion process by interrupting the chemical chain reaction.
5. What is the primary extinguishing method of Carbon Dioxide (CO2)?
A. Smothering
B. Cooling
C. Saponification
D. Chemical chain inhibition
Answer: A
Conceptual Explanation: Carbon Dioxide extinguishes fire primarily through smothering
by displacing oxygen.
6. A fire involving combustible metals like magnesium or sodium is classified as:
A. Class A
B. Class B
C. Class C
D. Class D
Answer: D
Conceptual Explanation: Class D fires involve combustible metals such as magnesium,
potassium, titanium, and sodium.
EXTINGUISHERS (LATEST 2026/ 2027
UPDATE) QUESTIONS AND 100%
CORRECT VERIFIED ANSWERS| GRADE
A+
1. Which classification of fire involves energized electrical equipment where the electrical
nonconductivity of the extinguishing agent is of importance?
A. Class C
B. Class B
C. Class A
D. Class D
Answer: A
Conceptual Explanation: Class C fires involve energized electrical equipment. The
extinguishing agent must not conduct electricity to protect the operator.
2. What is the numerical rating for a Class A extinguisher based on?
A. The square footage of the fire it can extinguish
B. The amount of water and the duration of discharge
C. The number of gallons of water, with 1-A equal to 1.25 gallons
,D. The weight of the extinguishing agent
Answer: C
Conceptual Explanation: A 1-A rating is equivalent to the extinguishing capability of 1.25
gallons of water. A 2-A rating would be 2.5 gallons.
3. Saponification is a process associated with which class of fire?
A. Class B
B. Class D
C. Class A
D. Class K
Answer: D
Conceptual Explanation: Saponification occurs when wet chemical agents react with
animal or vegetable oils in Class K fires to create a soapy foam that smothers the fire.
4. Which extinguishing agent works primarily by interrupting the chemical chain reaction?
A. Water
B. Dry Chemical
C. Carbon Dioxide
D. Aqueous Film Forming Foam (AFFF)
Answer: B
, Conceptual Explanation: Dry chemical agents like monoammonium phosphate interfere
with the combustion process by interrupting the chemical chain reaction.
5. What is the primary extinguishing method of Carbon Dioxide (CO2)?
A. Smothering
B. Cooling
C. Saponification
D. Chemical chain inhibition
Answer: A
Conceptual Explanation: Carbon Dioxide extinguishes fire primarily through smothering
by displacing oxygen.
6. A fire involving combustible metals like magnesium or sodium is classified as:
A. Class A
B. Class B
C. Class C
D. Class D
Answer: D
Conceptual Explanation: Class D fires involve combustible metals such as magnesium,
potassium, titanium, and sodium.
