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OIAFR LT. Test > IFSTA ARFF 6th: Ch. 7 > Flashcards

IFSTA ARFF 6th: Ch. 7 Flashcards

Extinguishing Agents

1
Q

High expansion foam has an air/solution ratio of what?

A

A range 200:1 to 1000:1

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2
Q

Low expansion foam has an air/solution ratio of what?

A

20:1

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3
Q

What are the situations where complementary agents can be used as the primary agent on a fire?

A

Wheel Wells
Engine Nacelles
Interior Walls
Compartments

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4
Q

How often does the FAA recommend foam systems to be tested?

A

at least twice a year

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5
Q

What two types of gas do extinguishers use?

A

Nitrogen or CO2

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6
Q

How much foam does a Barrel (drum) hold?

A

55 gal

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7
Q

What is the most commonly used extinguishing agent in the fire service?

A

Water

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8
Q

What is the most common type of foam proportioner?

A

In line foam eductor

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9
Q

Stored pressure extinguishers contain a constant pressure of what?

A

200psi

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10
Q

What will happen if the nozzle has a flow rating lower than the eductor?

A

Eductor will not flow enough water to pick up foam concentrate

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11
Q

Explain how Foam puts out fire by penetration?

A

Lower the surface temp of water and allows it to penetrate fires in Class A materials

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12
Q

What is the concentration rate of foam used on polar solvent fires?

A

3 to 6 percent

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13
Q

What does hydrophobic mean?

A

Incapable of mixing with water

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14
Q

AFFF stored in temp controlled environments, in original container have a shelf life of _______

A

20 years

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15
Q

Why aren’t complementary agents not as effective as primary agents?

A

They are prone to Flashback

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16
Q

What are two devices used to test finished foam?

A

Refractometer and Conductivity meter

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17
Q

What are the two ways to fill ARFF trucks with foam?

A

Topside Fill and Side Connection

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18
Q

Common elements from the halogen series are?

A

Cholrine
Flourine
Bromine
Iodine

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19
Q

When are self educting master stream nozzle used?

A

When GPM requirements exceed 350 gpm

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20
Q

What are two limitations to Protein Foam that led it being replaced by AFFF as the primary extinguishing agent?

A

Corrosiveness and inability to heal

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21
Q

Water converts to steam at an expansion rate of :

A

1700:1

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22
Q

What are (4) disruptions that should affect a good foam blanket?

A

Wind
Thermal updraft
Flame
Hydrocarbon attack

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23
Q

What can dry chemicals do to a protein foam blanket?

A

Degrade it

24
Q

Dry chemical handlines are required to have ____ feet of hose, and a range of ___ feet

A

100 / 25

25
Q

How does multipurpose dry chemical agents work?

A

It leaves a sticky residue on burning materials, creating a seal between the material and oxygen

26
Q

What does CAV stand for?

A

Combined Agent Vehicle

27
Q

Aircraft longer than ___ feet, have a TCA that that is 100 feet + the fuselage’s width.

A

65

28
Q

What is the concentration rate of foam used on hydrocarbon fires?

A

1 to 3 percent

29
Q

Plastic pails of foam should not be stacked more than how high?

A

3 pails high

30
Q

Class D fires are put out with MET-L-X extinguishers, G-1 Dry powder or what?

A

Copious amounts of water

31
Q

What is the most serious problem ARFF personnel will face when using foam?

A

They must quickly apply large quantities of foam to form a blanket on the fire

32
Q

What is the PCA?

A

2/3rds of the TCA

33
Q

How much foam does a pail hold?

A

5 gal

34
Q

Where are CAFSs most commonly found?

A

Structural and Wildland fire apparatus

35
Q

What two things must occur for foam to be used?

A

It must be proportioned and aerated

36
Q

Discharge rate of dry chemical through an extendable turret is?

A

12- 22lbs per sec

37
Q

How much foam does an Intermediate bulk container (IBC tote) hold?

A

250 to 450 gals

38
Q

Medium expansion foam has an air/solution ratio of what?

A

A range of 20:1 to 200:1

39
Q

What is a CAFS?

A

Compressed Air Foam System

40
Q

Why shouldn’t polar solvent foams be used in ARFF trucks?

A

the foam concentrate is too viscous

41
Q

What are two basic designs for handheld and wheeled dry chemical extinguishers?

A

Stored-pressure and cartridge-operated

42
Q

Dry chemical hand lines must have _____ times the system working pressure

A

3

43
Q

Rate of application of foam depends on what (4) variables?

A

Type of foam
Whether or not the fuel is on fire
Type of fuel
Whether fuel is spilled or in a tank

44
Q

Hydrocarbons fuels are petroleum based and ________

A

Hydrophobic

45
Q

Synthetic foam are made from what kind of products?

A

Petroleum

46
Q

Aircraft shorter than ___ feet, have a TCA that that is ___ feet + the fuselage’s width.

A

65 / 40

47
Q

What is the simplest means of proportioning foam?

A

Batch mixing (dump in method)

48
Q

Class B fuels have two categories:

A

Hydrocarbons and Polar Solvents

49
Q

Two of the most common halongenated compounds used for extinguishment are?

A

Halon 1211 and Halon 1301

50
Q

What are two types of foam injection systems?

A

Direct Injection and Balance pressure proportioners

51
Q

Dry chemical turrets must have a no wind range of ____ feet

A

100

52
Q

What is the TCA?

A

A region along the length of fuselage in which ARFF personnel can control a fire long enough to rescue victims

53
Q

ARFF personnel can mix foam concentrate with water, _________ or ________

A

brackish water / saltwater

54
Q

How many more times effective is Purple K than Sodium Bicarb based dry chemicals?

A

2 times

55
Q

Modern automotive fuel blends include gasoline with ___ percent or more solvent additives

A

10

OIAFR LT. Test (33 decks)

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