Fire Streams Chap 16

Front 1

Which hoseline size is used to supply a handline stream?

Back 1

1½- to 3-inch (38 mm to 77 mm) hoselines

Front 2

Installed in-line eductors, around-the-pump proportioners, and balanced pressure proportioners are examples of:

Back 2

apparatus-mounted proportioners.

Front 3

Which nozzle produces a compact stream with little shower or spray?

Back 3

Smooth bore nozzle

Front 4

When applied to solid fuels, Class A foam blankets the fuel, controls flames, then:

Back 4

breaks down, releasing water to cool the fuel.

Front 5

Multipurpose Class B foams are normally mixed at a 6 percent rate when:

Back 5

applied to polar solvents.

Front 6

Class A foam extinguishes and/or prevents ignition by:

Back 6

allowing water to penetrate fuels.

Front 7

What do slide valves do?

Back 7

permit water to flow without creating turbulence.

Front 8

The primary way water extinguishes fire is by:

Back 8

absorbing heat

Front 9

Statement about air foam systems (CAFS)

Back 9

Foam produced by CAFS adheres well to vertical surfaces.

Front 10

The proportioning method which uses an external pump or head pressure to force foam concentrate into the fire stream is

Back 10

The correct answer is: injection.Which of the following statements about operating fog nozzles on handlines is MOST accurate?

Front 11

A common reason for generating poor-quality foam is:

Back 11

The correct answer is: mixing different types of foam concentrate in the same tank.

Front 12

To prevent water hammer

Back 12

The correct answer is: close control valves slowly

Front 13

fog nozzles

Back 13

can provide protection to firefighters with a wide fog pattern

Front 14

characteristic of nozzles designed to operate at pressures less than 100 psi (700 kPa)?

Back 14

Produce lower-density fog patterns

Front 15

The energy required to raise the temperature of a substance by one degree is called:

Back 15

Specific Heat.

Front 16

Class B foams are especially effective on

Back 16

hydrocarbon fuels and polar solvents

Front 17

Additional personnel will be required to safely handle smooth bore nozzles at nozzle pressures greater than

Back 17

65 psi (450 kPa)

Front 18

Which stream is created by apparatus-mounted appliances?

Back 18

Master stream

Front 19

High-expansion foam is typically used for

Back 19

confined spaces such as mines and shipboard compartments

Front 20

As water is vaporized into steam, it expands approximately ____ its original volume

Back 20

1,700 times

Front 21

How may gravity, friction of air, and wind act on a solid fire stream?

Back 21

They may decrease the reach of the stream

Front 22

Which of the following types of fog nozzles provides a constant discharge rate throughout a range of patterns?

Back 22

Constant gallonage

Front 23

Which fire stream pattern is produced by a fixed orifice, smooth bore nozzle?

Back 23

Solid stream

Front 24

Which of the following statements about fire fighting foams is MOST accurate?

Back 24

Air is added to the foam solution by mechanical agitation.

Front 25

used only on a pool of ignited or unignited fuel on open ground?

Back 25

Roll-on method

Front 26

Which fire stream patterns can be used for hydraulic ventilation?

Back 26

Fog-stream

Front 27

Foam lowers surface tension of water, allowing it to ___ fires in Class A materials

Back 27

penetrate

Front 28

Most foam concentrates are intended to be mixed with ___ percent water

Back 28

94 to 99.9

Front 29

Latent Heat of Vaporization is

Back 29

the amount of heat required to convert a unit mass of a liquid into a vapor without temperature change

Front 30

In actual operation, fire stream angles between ___ provide maximum reach.

Back 30

30 to 34 degrees

Front 31

Which size fire stream flows 40 to 350 gpm (160 L/min to 1 400 L/min)?

Back 31

Handline stream

Front 32

Friction loss may be overcome by

Back 32

increasing pump pressure

Front 33

Which of the following nozzle control valves also controls the discharge pattern of the fire stream?

Back 33

Rotary control valve

Front 34

Poor-quality foam may result from

Back 34

air leaks at fittings causing a loss of suction

Front 35

Which foams are required to extinguish fires of ethanol or ethanol-based fuels?

Back 35

Alcohol-resistant foams

Front 36

When using an in-line eductor, which of the following might cause foam concentrations to be too lean?

Back 36

Foam concentrate inlet too far above surface of foam concentrate

Front 37

A fire stream is a stream of water or extinguishing agent after it:

Back 37

leaves the fire hose nozzle until it reaches the desired target.

Front 38

Which type of nozzle can be used to effectively control fires in concealed spaces?

Back 38

Piercing

Front 39

What are specialized foams designed solely for use on unignited spills of hazardous liquids?

Back 39

Unignited chemicals tend to change the pH of water or remove the water from fire fighting foam, making the foam ineffective.

Front 40

The degree of foam expansion depends on the type of foam concentrate, accurate proportioning, quality of the foam concentrate and:

Back 40

method of aeration