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Driver Ops > Chapter 14 > Flashcards

Chapter 14 Flashcards

1
Q

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

A

Aqueous film forming foam

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2
Q

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

A

main fire pump

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3
Q

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

A

Bypass-type balanced pressure proportioner

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4
Q

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

A

Fog nozzles

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5
Q

released as fire fighting foam breaks down, providing a cooling effect on the fuel and suppressing the process of heat-producing oxidation

A

Water

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6
Q

In order to produce fire fighting foam, what three items must be educted or injected in correct ratios

A

Foam concentrate, water, and air

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7
Q

used to combat concealed space fires in cellars or other subterranean spaces?

A

High-expansion foam

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8
Q

examples of polar solvent fuels requiring the use of special polymeric fire fighting foam

A

Alcohol and ketones

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9
Q

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

A

Class B

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10
Q

what happens to regular protein foams

A

They degrade more quickly and are becoming increasingly rare.

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11
Q

The formula of Class A form includes _____ that reduce the surface tension of water in the foam solution

A

hydrocarbon surfactants

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12
Q

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

A

high air content

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13
Q

In which of the following situations is it acceptable to mix together different manufacturers’ foam concentrates

A

If they are mil-spec concentrates

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14
Q

common handline nozzle used for foam application

A

fog nozzle

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15
Q

determined by the rate at which natural bacteria can degrade foam

A

Biodegradability

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16
Q

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

A

0.5 to 1.0 percent concentrate

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17
Q

explains why fuel and fire might consume a portion or the entire foam blanket

A

Inconsistent application time

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18
Q

In which of the following ways are durable agents similar to Class A foam

A

Both products are used in a similar fashion

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19
Q

What are the two basic types of medium- and high-expansion foam generators?

A

Water aspirating and mechanical blower

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20
Q

Viscosity, or the thickness and ability of a liquid to flow freely, is MOST likely to be affected by:

A

temperature

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21
Q

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

A

proportioning

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22
Q

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

A

Class A foam from a CAFS

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23
Q

batch mixing

A

is potentially inaccurate

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24
Q

limitation of CAFS

A

In the event of a hose burst, compressed air will intensify the reaction of the hoseline.

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25
Q

Class B synthetic foam concentrate is made from:

A

a mixture of fluorosurfactants.

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26
Q

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

A

jet ratio controller

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27
Q

Direct application is a method of attack that is BEST used with

A

Class A

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28
Q

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

A

Foam Nozzles

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29
Q

likely to affect the degree of expansion in a foam solution

A

Method of aeration

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30
Q

foam proportioner that is designed to be attached directly to the pump panel discharge or connected at some point in the hose lay

A

In-line foam eductors

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31
Q

variable-flow demand-type balanced pressure proportioners

A

consists of a variable speed mechanism driven electrically or hydraulically that operates a foam concentrate pump

32
Q

What is the smallest type of foam storage container

A

Pails

33
Q

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

A

24 hours

34
Q

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?

A

Around-the-pump proportioner

35
Q

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

A

Premixing

36
Q

In order to eliminate using pails or barrels to supply a foam eductor, fire apparatus equipped with onboard foam proportioning systems usually have _____ piped directly to the delivery system.

A

foam concentrate tanks

37
Q

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

A

Airtight Storage

38
Q

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

A

Dry Foam

39
Q

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

A

Air-aspirating foam nozzles

40
Q

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

A

A variable flow rate sensing proportioner

41
Q

is an element that affects the breakdown process of Class A foam?

A

Ambient air temperature

42
Q

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

A

bypass

43
Q

What are Mil-Spec concentrates?

A

Foam concentrates manufactured to U.S. Military specifications

44
Q

High-energy foam generating systems/CAFS differ from other methods because

A

they introduce compressed air into the foam solution prior to discharge into the hoseline.

45
Q

described as the device that injects the correct amount of foam concentrate into the water stream to make the foam solution

A

Foam proportioner

46
Q

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

A

slowly circulating water in the tank

47
Q

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

A

Self-educting master stream foam nozzle

48
Q

method for Class B foam application involves directing the foam onto a vertical surface and allowing it to run down and spread across pooled fuel product?

A

Bank-down method

49
Q

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:

A

application rate

50
Q

Why is it important to avoid direct application of Class A foam to natural bodies of water

A

It can harm aquatic life.

51
Q

following operating guidelines must be followed to achieve properly proportioned finished foam?

A

The flow in gallons per minute (L/min) through the eductor must not exceed its rated capacity.

52
Q

is true about the adequate and/or inadequate production of foam when an in-line proportioner is used?

A

A partially closed nozzle will result in a flow rate that will not allow the creation of a Venturi effect.

53
Q

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

A

Injection

54
Q

is a disadvantage of durable agents

A

Once applied, surfaces coated with these products become very slippery for walking or driving

55
Q

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

A

dividing the flow rate by the area of the fire.

56
Q

The process of foam decomposition results in the consumption of:

A

oxygen

57
Q

For a portable foam application device, once foam concentrate and water have mixed to form a foam solution, the solution must be

A

aerated

58
Q

Mixed with air

A

aerated

59
Q

Mixed with water

A

proportion

60
Q

3 things foam does

A

Separates
Cools
Suppresses

61
Q

4 way foam is proportioned

A

Induction
Injection
Batch Mixing
Premixing

62
Q

4 way foam is stored and size

A

Pail - 5 gal
Barrel 55 gal
Tote 275 gal
Apparatus Tank 20-200 gal

63
Q

Foam tenders may carry up to

A

8000 gal of foam

64
Q

Class A foam should avoid skin contact because is can be

A

corrosive

65
Q

Common proportioning for Class A Foam

A

.2-.5 FIRE ATTACK with standard nozzles and CAFS
.3-.7 with air aspirating nozzles
.5-1 EXPOSURE protection with standard nozzles

66
Q

Shelf life of Class A and B Foam

A

A - 20 yrs

B - 20-25 yrs

67
Q

Foam which is safer for the environment

A

Protein Based Foams

68
Q

Foam Expansion air/solution ratio for low, medium, high

A

Low- 20:1
Med - 20:1-200:1
High - 200:1- 1000:1

69
Q

Alcohol resistive properties will be effective for approx.

A

15 minutes

70
Q

Uses a modified venturi design, capable of delivering 14,000 gpm

A

Self-Educting Master Stream

71
Q

3000 feet of supply
50ft of elevation
66.5 solution

A

Jet Ratio Controller

72
Q

Medium and High Expansion ratios

A

20: 1 - 200:1
200: 1 - 1000:1

73
Q

Standard rule that dictates the discharge orifice be no greater than

A

half the diameter of the hose

74
Q

Only nozzle that can be used with fluoroproteins

A

Air-Aspirating Fogs

75
Q

Fog Nozzle low expansion ration

A

2:1 - 4:1

Driver Ops (15 decks)

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