Fire Extinguishers Flashcards
7 cards from real FST practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Fire Extinguishers flashcards as text
Which agent is prohibited from being used on a Class D (combustible metal) fire?
Answer: Water or water-based agents
Water reacts violently with many burning metals such as sodium, potassium, and magnesium, potentially causing explosions or spreading the fire; water-based agents are strictly prohibited on Class D fires.
An extinguisher fails its hydrostatic test. What must the technician do?
Answer: Condemn the extinguisher and render it inoperable before disposal
A cylinder that fails hydrostatic testing must be condemned and rendered permanently inoperable (typically by cutting or crushing) to prevent reuse.
What does a 'loaded stream' fire extinguisher use as its agent?
Answer: Water with an alkali metal salt anti-freeze additive
A loaded stream extinguisher uses water with an alkali metal salt (such as potassium acetate or potassium carbonate) as an anti-freeze and fire-suppression additive.
Per NFPA 10, who is authorized to perform the annual maintenance inspection of a portable fire extinguisher?
Answer: A certified fire protection technician or qualified person with proper training and equipment
NFPA 10 requires annual maintenance to be performed by a trained person with proper equipment and knowledge, typically a certified fire extinguisher technician.
What is the purpose of the tamper indicator (seal) on a fire extinguisher?
Answer: To show the extinguisher has been inspected and the safety pin has not been removed
The tamper indicator (safety seal) wraps the safety pin to provide visible evidence that the extinguisher has not been used, tampered with, or accidentally activated.
A multi-purpose dry chemical extinguisher uses which agent?
Answer: Monoammonium phosphate
Multi-purpose (ABC) dry chemical extinguishers use monoammonium phosphate as the active agent, which is effective on Class A, B, and C fires.
When inspecting a wheeled fire extinguisher, which item is NOT a standard inspection check per NFPA 10?
Answer: Testing the extinguisher by discharging a small amount of agent
Monthly inspections are visual checks only; discharging agent is not part of routine inspection and would require recharging the unit before returning it to service.