FDNY W96 Full Service Shop of Portable
Fire Extinguishers Exam Practice
Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1. What is the minimum hydrostatic test pressure for a 5 lb dry chemical
fire extinguisher rated for 350 psi service?
A. 400 psi
B. 500 psi
C. 600 psi
D. 700 psi
Rationale: Hydrostatic testing requires applying a pressure that is 5/3
times the service pressure for dry chemical extinguishers, which in this case
is 600 psi.
, 2. How often must stored pressure fire extinguishers be inspected
visually in a full-service shop?
A. Every month
B. Every 6 months
C. Annually
D. Every 5 years
Rationale: Full-service shops must perform an annual inspection on all
stored-pressure extinguishers in addition to monthly checks at the point of
use.
3. Which color code is generally used for identifying a carbon dioxide
(CO2) fire extinguisher?
A. Red
B. Blue
C. Black
D. Green
Rationale: In the US, CO2 fire extinguishers have a black label or panel to
differentiate them from other types.
4. What should you do before refilling a portable fire extinguisher?
A. Weigh the extinguisher only
B. Only replace the nozzle
, C. Completely discharge and inspect for damage
D. Check the expiration date only
Rationale: Discharging and inspecting ensures the extinguisher is safe to
refill and that there are no leaks or damage that could compromise
performance.
5. Which class of fire is a foam extinguisher most suitable for?
A. Class A
B. Class B
C. Class C
D. Class D
Rationale: Foam extinguishers are effective on flammable liquid fires (Class
B) by creating a barrier between the fuel and oxygen.
6. What is the main function of a pressure gauge on a stored-pressure
extinguisher?
A. To measure temperature
B. To indicate proper internal pressure
C. To show the weight of chemical
D. To regulate chemical discharge rate
Rationale: The gauge confirms that the extinguisher is pressurized correctly
and ready for use.
, 7. How long should a fire extinguisher be held under hydrostatic test
pressure?
A. 10 seconds
B. 30 seconds
C. 30 seconds to 1 minute
D. 5 minutes
Rationale: Industry standards require holding the extinguisher under
pressure for 30 seconds to 1 minute to check for leaks or deformation.
8. What is the recommended storage environment for portable fire
extinguishers in a full-service shop?
A. Outdoors under shade
B. Near chemicals
C. Cool, dry, and ventilated area
D. Humid areas
Rationale: Extinguishers must be stored in an environment that prevents
corrosion, freezing, or chemical damage.
9. What is the primary safety concern when servicing carbon dioxide fire
extinguishers?
A. Overfilling with water
Fire Extinguishers Exam Practice
Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1. What is the minimum hydrostatic test pressure for a 5 lb dry chemical
fire extinguisher rated for 350 psi service?
A. 400 psi
B. 500 psi
C. 600 psi
D. 700 psi
Rationale: Hydrostatic testing requires applying a pressure that is 5/3
times the service pressure for dry chemical extinguishers, which in this case
is 600 psi.
, 2. How often must stored pressure fire extinguishers be inspected
visually in a full-service shop?
A. Every month
B. Every 6 months
C. Annually
D. Every 5 years
Rationale: Full-service shops must perform an annual inspection on all
stored-pressure extinguishers in addition to monthly checks at the point of
use.
3. Which color code is generally used for identifying a carbon dioxide
(CO2) fire extinguisher?
A. Red
B. Blue
C. Black
D. Green
Rationale: In the US, CO2 fire extinguishers have a black label or panel to
differentiate them from other types.
4. What should you do before refilling a portable fire extinguisher?
A. Weigh the extinguisher only
B. Only replace the nozzle
, C. Completely discharge and inspect for damage
D. Check the expiration date only
Rationale: Discharging and inspecting ensures the extinguisher is safe to
refill and that there are no leaks or damage that could compromise
performance.
5. Which class of fire is a foam extinguisher most suitable for?
A. Class A
B. Class B
C. Class C
D. Class D
Rationale: Foam extinguishers are effective on flammable liquid fires (Class
B) by creating a barrier between the fuel and oxygen.
6. What is the main function of a pressure gauge on a stored-pressure
extinguisher?
A. To measure temperature
B. To indicate proper internal pressure
C. To show the weight of chemical
D. To regulate chemical discharge rate
Rationale: The gauge confirms that the extinguisher is pressurized correctly
and ready for use.
, 7. How long should a fire extinguisher be held under hydrostatic test
pressure?
A. 10 seconds
B. 30 seconds
C. 30 seconds to 1 minute
D. 5 minutes
Rationale: Industry standards require holding the extinguisher under
pressure for 30 seconds to 1 minute to check for leaks or deformation.
8. What is the recommended storage environment for portable fire
extinguishers in a full-service shop?
A. Outdoors under shade
B. Near chemicals
C. Cool, dry, and ventilated area
D. Humid areas
Rationale: Extinguishers must be stored in an environment that prevents
corrosion, freezing, or chemical damage.
9. What is the primary safety concern when servicing carbon dioxide fire
extinguishers?
A. Overfilling with water
