Firefighter II - Chapter 23

Class A foams are formulated to be mixed with water in ratios from __________%.

0.1 to 1.0

To batch mix 3% foam into a 500-gallon (1894L) booster tank, you would need to add __________ of foam concentrate to the tank.

15 gal (56 L)

Standards for fire hose testing are found in NFPA:

1962

Low-expansion foam has an expansion ration of less than ______:1.

20

Medium-expansion foam creates a maximum expansion ratio of _________ to 1.

200

Which is an advantage of compressed air foam?

Adheres to most surfaces

Which is the correct nozzle to use with medium-expansion foam?

Air-aspirating

Which type of foam is effective on polar solvents?

Alcohol-resistant

A foam blanket disrupts which component of the fire tetrahedron?

All of these are correct.

Which statement most accurately describes a transitional attack?

An offensive attack initiated from the exterior of the structure.

Which type of foam is particularly well suited for gasoline spills?

Aqueous film-forming

Where should streams be directed to prevent a BLEVE?

At the area where the tank is being heated

What is the most severe hazard associated with propane products?

BLEVE

Which foam application method is best for an open-top storage tank fire?

Bounce-off

Which factor weighs in favor of an offensive attack?

Bystanders report the building is occupied

What is the best item to aid extinguishment of smoldering fires in tightly packed combustible materials?

Class A foam

Which is the best method to extinguish a fire caused by an LPG regulator or pipe failure?

Close the main discharge valve on the cylinder.

Which attack is typically performed from a hallway or doorway?

Combination

What does the C stand for in the acronym SLICE-RS?

Cool the space from the safest location

An abandoned building is fully involved in fire. Which type of operation is appropriate?

Defensive

At a structure fire, a continuous water supply is unavailable. Which type of operation is appropriate?

Defensive

Master stream devices are most commonly used for which operation?

Defensive

Which type of fire suppression operation is the only acceptable option in a high-risk situaiton?

Defensive

Which type of foam proportioner relies on the Venturi effect?

Eductor

What is added to propane to give it a distinct odor?

Ethyl mercaptan

Defensive firefighting operations are typically conducted from which location?

Exterior

What does the E stand for in the acronym SLICE-RS?

Extinguish the fire.

What is a BLEVE?

Flammable liquid vessel rupture and explosion due to external heating

Class B foam is used for which type of fire?

Flammable liquids

Which is the minimum temperature at which a liquid produces an ignitable vapor?

Flash Point

When is a combination attack indicated?

Flashover conditions are developing

What is high-expansion foam usually used for?

Flooding of large enclosed areas

What is the term for the movement of heat and smoke from an area of higher pressure to lower pressure?

Flow path

Which type of foam contains a surface-active agent that produces a fast-spreading film?

Fluoroprotein

Which is a two-dimensional fire?

Ignited flammable liquid spill on open ground

Which is an attribute of a "wet" Class A foam?

Improved fuel penetrating properties

Close-range application of water to burning surfaces is the immediate objective of which type of operation?

Offensive

Operations are conducted from inside of the fire building in which type of operation?

Offensive

How is foam proportioned in most portable extinguishers?

Premixing

Which device mixes foam concentrate in the water stream in the proper percentage?

Proportioner

Which type of foam is made from animal by-products?

Protein

Which is the objective of the first phase of a transitional fire attack?

Reduce interior temperatures.

Which is a benefit of Class A foam?

Reduces the surface tension of water

Which item is installed on propane cylinders to allow excess pressure to escape?

Relief valve

In the SLICE-RS acronym, which is an action of opportunity?

Rescue

Which foam application method is best for a pool of flammable liquid on open ground?

Roll-in

Which is an indicator of impending building collapse?

Sudden increase in the intensity of the fire from the roof opening.

Which is an appropriate use for Class B foam?

Suppress vapor production from an unignited fuel spill

What is the target of the hose stream in a direct attack?

The burning surfaces

A straight stream is briefly discharged through a window from the building exterior. This is typical of which type of attack?

Transitional

When approaching a burning flammable liquid vessel to operate the valve, which combination of hose streams should be used?

Two 1 3/4" (45 mm)

Which action should be taken if rapidly deteriorating smoke, fire, or heat conditions become evident during interior operations?

Withdraw from the structure

A combination fire attack begins with:

an indirect attack.

Fire hose should be tested at least:

annually.

Adding foam concentrate to a fire apparatus tank is called __________ mixing.

batch

The low surface tension of Class A foam affects its extinguishing properties by:

enabling water to penetrate the fuel more deeply.

From the exterior, a crew directs a hose stream through the window of a burning room. This is a(n) __________ attack.

indirect

Compared to wet foam, dry foam provides:

longer-lasting foam.

An action's potential positive results and its potential negative consequences are evaluated during the:

risk-benefit analysis.

When fighting a horizontal flammable-gas cylinder fire, you should operate from:

the side.

A burning liquid that is pouring over the edge of a container is known as a __________ fire.

three-dimensional