NFSI Firefighting Knowledge 5

Question 1

What is 'water hammer,' and why is it a concern during fireground operations?

Accepted Answer

A pressure surge in hose lines caused by rapidly opening or closing valves, potentially rupturing equipment

Answer

Water hammer is a destructive pressure wave created by sudden changes in water flow velocity, capable of damaging pumps, couplings, and hose lines.

Question 2

What is the purpose of the 'cool, cover, and call' approach for burn victims at a fire scene?

Accepted Answer

Cool with cool (not cold) water, cover to prevent hypothermia, and call for advanced medical care

Answer

Cool water stops the burning process, covering prevents hypothermia and contamination, and calling for ALS ensures the victim receives definitive care for serious burns.

Question 3

What is the primary purpose of salvage operations during and after a fire?

Accepted Answer

To protect property from further damage by fire, water, and smoke through covering and removing items

Answer

Salvage operations use covers, squeegees, and water removal techniques to minimize property damage from suppression activities, reducing overall loss.

Question 4

In wildland firefighting, what does the acronym LCES stand for?

Accepted Answer

Lookouts, Communications, Escape routes, Safety zones

Answer

LCES (Lookouts, Communications, Escape routes, Safety zones) is the foundational safety system for wildland firefighters to prevent entrapment.

Question 5

Which type of building construction is most susceptible to rapid structural failure during a fire due to lightweight engineered components?

Accepted Answer

Type V (wood frame) with lightweight truss construction

Answer

Lightweight wood trusses and I-joists used in modern Type V construction can fail in as little as 5–7 minutes of fire exposure, far faster than older solid-wood construction.

NFSI - National Firefighter Selection Inventory Practice Test

NFSI - National Firefighter Selection Inventory Practice Test

NFSI Firefighting Knowledge 5