Chapter 14 - Foam Equipment and Systems

Question 1

When large-scale flammable and combustible liquid fires require the delivery of an amount of foam that is beyond the capability of the handlines, which of the following should be used?

Answer 1

Master stream foam nozzles

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Question 2

Other additives currently available for use as extinguishing agents, as well as pre-treatment of structures threatened by fire spread, are generally known as:

Answer 2

durable or gelling agents.

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Question 3

Which of the following is a common type of portable foam proportioner?

Answer 3

In-line foam eductor

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Question 4

When using low energy portable foam application systems, the aeration and discharge functions are completed by:

Answer 4

an aerating foam nozzle.

Question 5

variable-flow demand-type balanced pressure proportioners consists of a variable speed mechanism driven electrically or hydraulically that operates a:

Answer 5

foam concentrate pump.

Question 6

Batch mixing is generally only used with which types of foam concentrates?

Answer 6

Class A and regular AFFF concentrates

Question 7

Which foam consists of fluorochemical and hydrocarbon surfactants combined with solvents to create a high boiling point?

Answer 7

Aqueous film forming foam (AFFF)

Question 8

Both of the basic types of medium- and high-expansion foam generators produce foam containing __________ content.

Answer 8

high air content.

Question 9

Which foam is MOST likely to be used to combat concealed space fires in cellars or other subterranean spaces?

Answer 9

High-expansion foam

Question 10

Batch mixing is generally only used with which types of foam concentrates?

Answer 10

Class A and regular AFFF concentrates

Question 11

Which is the most common apparatus-mounted foam proportioner and consists of a small return (bypass) water line connected from the discharge side of the pump back to the intake side of the pump?

Answer 11

Around-the-pump proportioner

Question 12

What is the smallest type of foam storage container?

Select one:

Answer 12

Pails

Question 13

A type of in-line eductor that may be used to supply foam concentrate to a self-educting master stream foam nozzle is called a:

Answer 13

jet ratio controller

Question 14

Because it forms a rigid coating that adheres well and is slow to drain, the best consistency of Class A foam for vertical surfaces is:

Answer 14

dry foam

Question 15

Installed in-line eductors are most commonly used to proportion which class of foam?

Answer 15

Class B

Question 16

Low energy foam systems impart pressure on the foam solution with the use of the:

Answer 16

main fire pump

Question 17

What are Mil-Spec concentrates?

Answer 17

Foam concentrates manufactured to U.S. Military specifications

Question 18

The minimum amount of foam solution that must be used on a fire per minute per square foot (square meter) of fire is called the:

Answer 18

application rate.

Question 19

What is the commonly used guideline for proportioning Class A foam for exposure protection with standard fog nozzles?

Answer 19

0.5 to 1.0 percent concentrate

Question 20

Which piece of equipment injects the correct amount of foam concentrate into the water stream to make the foam solution?

Answer 20

Foam proportioner

Question 21

Class B synthetic foam concentrate is made from:

Answer 21

a mixture of fluorosurfactants.

Question 22

when an in-line proportioner is used, a partially closed nozzle will result in a flow rate that will:

Answer 22

not allow the creation of a Venturi effect

Question 23

Which kind of nozzle allows firefighters the option of operating fixed flow, selective flow, or automatic flow when applying a low expansion, short duration foam blanket?

Answer 23

Fog nozzles

Question 24

Why might fuel and fire consume a portion or the entire foam blanket?

Answer 24

Inconsistent application time

Question 25

regular protein foams _______ more quickly and are becoming increasingly rare.

Answer 25

degrade

Question 26

Class A foam solutions do not retain their foaming properties when mixed in water for more than:

Answer 26

24 hours

Question 27

When using the batch mixing proportioning method, frothing can be avoided by:

Answer 27

slowly circulating water in the tank.

Question 28

Which factor is most likely to affect the degree of expansion in a foam solution?

Answer 28

Method of aeration

Question 29

In some installed in-line eductor systems, a(an) _____ proportioner is installed to reduce the friction loss across the eductor.

Answer 29

bypass

Question 30

a disadvantage of durable agents is once applied, surfaces coated with these products become:

Answer 30

very slippery for walking or driving.

Question 31

Which of the following has a pickup tube that is located in the center bore of the nozzle and uses a modified Venturi design to draw concentrate into its water stream?

Answer 31

Self-educting master stream foam nozzle

Question 32

designed to work in conjunction with proportioners to produce the best possible foam?

Answer 32

Foam nozzles

Question 33

A smooth bore nozzle is limited to application of which classification of foam?

Answer 33

Class A foam from a CAFS

Question 34

Driver/operators calculate the application rate available from a specific nozzle by:

Answer 34

dividing the flow rate by the area of the fire.

Question 35

Which variable affects a foam’s rate of application?

Answer 35

Whether the fuel is contained or uncontained

Question 36

Ambient ___________ affects the breakdown process of Class A foam.

Answer 36

air temperature

Question 37

Regardless of the type of tank, what is one characteristic that all foam storage containers share?

Answer 37

Airtight storage

Question 38

Which proportioning method uses an external pump to force foam concentrate into the fire stream at the proper ratio in comparison to the flow?

Answer 38

Injection

Question 39

In which situation is it acceptable to mix together different manufacturers’ foam concentrates?

Answer 39

If they are mil-spec concentrates

Question 40

In what way are durable agents similar to Class A foam?

Answer 40

Both products are used in a similar fashion.

Question 41

The act of mixing water with foam concentrate to form a foam solution is called:

Answer 41

proportioning.

Question 42

Which kind of nozzle inducts air into foam solution by a Venturi action and is the only nozzle that should be used with protein and fluoroprotein concentrates?

Answer 42

Air-aspirating foam nozzles

Question 43

The process of foam decomposition results in the consumption of:

Answer 43

oxygen.

Question 44

Due to the low eduction rates on a CAFS apparatus, what is required to supply the fire stream at the rate of 0.1 to 1.0 percent?

Answer 44

A variable flow rate sensing proportioner

Question 45

Which is a proportioner used on large mobile apparatus installations, such as ARFF vehicles, and is one of the most accurate methods of foam proportioning?

Answer 45

Bypass-type balanced pressure proportioner

Question 46

A limitation of CAFS is In the event of a hose burst, compressed air will:

Answer 46

intensify the reaction of the hoseline

Question 47

Which proportioning method uses premeasured portions of water and foam concentrate that are mixed in a container?

Answer 47

Premixing