FST Fire Extinguishers 5

Question 1

Which agent is prohibited from being used on a Class D (combustible metal) fire?

Accepted Answer

Water or water-based agents

Answer

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.

Question 2

An extinguisher fails its hydrostatic test. What must the technician do?

Accepted Answer

Condemn the extinguisher and render it inoperable before disposal

Answer

A cylinder that fails hydrostatic testing must be condemned and rendered permanently inoperable (typically by cutting or crushing) to prevent reuse.

Question 3

What does a 'loaded stream' fire extinguisher use as its agent?

Accepted Answer

Water with an alkali metal salt anti-freeze additive

Answer

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.

Question 4

Per NFPA 10, who is authorized to perform the annual maintenance inspection of a portable fire extinguisher?

Accepted Answer

A certified fire protection technician or qualified person with proper training and equipment

Answer

NFPA 10 requires annual maintenance to be performed by a trained person with proper equipment and knowledge, typically a certified fire extinguisher technician.

Question 5

What is the purpose of the tamper indicator (seal) on a fire extinguisher?

Accepted Answer

To show the extinguisher has been inspected and the safety pin has not been removed

Answer

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.

(FST) Fire Safety Technician Certification Practice Test

(FST) Fire Safety Technician Certification Practice Test

FST Fire Extinguishers 5