Chapter 7 Fire Hose Nozzles and Flow Rates

Question 1

Solid stream nozzles are designed to produce a stream as ___ as possible with little shower or spray.

Answer 1

compact

Question 2

What characteristic does a solid stream nozzle have that other streams may not?

Answer 2

Superior reach

Question 3

Solid stream nozzles may be used on:

Answer 3

A. handlines.
B. portable master streams.
C. elevated master streams.
D. all of the above.*

Question 4

Solid stream nozzles are designed so that the shape of the water in the nozzle is gradually reduced until it reaches a point a short distance from the outlet; at this point, the nozzles becomes a cylindrical bore whose length is:

Answer 4

one to one and one-half times its diameter.

Question 5

Which of the following can significantly alter stream shape and performance?

Answer 5

A. The length of the nozzle
B. The position of the nozzle
C. The diameter of the hoseline
D. Alteration or damage to the nozzle*

Question 6

The size of the discharge opening and ___ determine the flow and stream reach.

Answer 6

nozzle pressure

Question 7

Solid stream nozzles should be operated at ___ psi (kPa) on handlines.

Answer 7

50 psi (350 kPa)

Question 8

Solid stream nozzles should be operated at ___ psi (kPa) on master stream devices.

Answer 8

80 psi (560 kPa)

Question 9

Fog streams may be produced by deflection at the periphery, by impinging jets of water, or by:

Answer 9

a combination of deflection and impingement.

Question 10

Periphery-deflected streams are produced by deflecting water from the periphery of:

Answer 10

an inside circular stem in a periphery-deflected fog nozzle.

Question 11

In a periphery-deflected fog stream nozzle, the shape of the stream is determined by the relative position of the deflecting stem and ___ of the nozzle.

Answer 11

the exterior barrel of a fog nozzle.

Question 12

What type of fog nozzle drives several jets of water together at a set angle to break the water into a fog stream of finely divided particles?

Answer 12

Impinging stream

Question 13

Why are fog patterns easier to handle than solid or straight stream patterns?

Answer 13

The reaction forces largely counterbalance each other.

Question 14

Which types of fog nozzle are designed to flow a specific amount of water at a specific nozzle dischage pressure on all stream patterns?

Answer 14

Constant flow nozzles

Question 15

Which types of fog nozzle have a number of constant flow settings, enabling the firefighter to select a flow rate that best suits the existing conditions?

Answer 15

Manually adjustable nozzles

Question 16

Which types of fog nozzle are the most common variable flow nozzles in use today?

Answer 16

Automatic nozzles

Question 17

Which types of fog nozzle develop a fog stream with considerable forward velocity but deliver a relatively low volume of water?

Answer 17

High-pressure nozzles

Question 18

Which types of fog nozzle maintain approximately the same nozzle pressure and pattern even if the gallonage supplied to the nozzle changes?

Answer 18

Automatic nozzles

Question 19

Which types of fog nozzle is NOT recommended for structural fire fighting?

Answer 19

High-pressure nozzles

Question 20

Which types of fog nozzle discharge the same volume of water regardless of the pattern setting?

Answer 20

Constant flow nozzles

Question 21

Which types of fog nozzle supply the selected flow at the rated nozzle discharge pressure?

Answer 21

Manually adjustable nozzles

Question 22

Which types of fog nozzle serve as a pressure regulator for the pumper as lines are added or shut down, ensuring that all available water may be used continuously?

Answer 22

Automatic nozzles

Question 23

Which types of fog nozzle are best suited for fighting wildland fires?

Answer 23

Manually adjustable nozzles

Question 24

Handline nozzles are designed to be placed on ___ that can be easily maneuvered by firefighters.

Answer 24

attack lines

Question 25

Which of the following is NOT a type of handline nozzle?

Answer 25

Master

Question 26

Handline nozzles can flow a maximum of ___ gpm (L/min) safely.

Answer 26

350 gpm (1 400 L/min)

Question 27

What is the definition of a master stream?

Answer 27

Any fire stream that is too large to be controlled without mechanical aid

Question 28

Master stream nozzles:

Answer 28

are either solid or fog streams.

Question 29

Master stream nozzles area usually operated at ___ psi (kPa) for smoothbore and ___ psi (kPa) for fog.

Answer 29

80 psi (560 kPa); 100 psi (700 kPa)

Question 30

Master stream nozzles flow:

Answer 30

350 gpm (1 400 L/min) or greater.

Question 31

Which types of master stream nozzle are often incorrectly referred to as deluge sets?

Answer 31

Monitors

Question 32

Which types of master stream nozzle have preplumbed waterways instead of hose?

Answer 32

Elevated master streams

Question 33

Which types of master stream nozzle have a siamese connection at the supply end?

Answer 33

Deluge sets

Question 34

Which types of master stream nozzle are mounted on a fire apparatus deck and is connected directly to the pump by permanent piping?

Answer 34

Turret pipes

Question 35

Which types of master stream nozzle may be used with elevating platforms?

Answer 35

Elevated master streams

Question 36

What components make up a deluge set?

Answer 36

A short length of large diameter hose with a large nozzle or large playpipe supported at the discharge end by a tripod

Question 37

What are turret pipe master stream devices also called?

Answer 37

Deck guns or deck pipes

Question 38

Which of the following is NOT a type of monitor?

Answer 38

Ladder pipe

Question 39

What type of master stream device cannot change the direction or angle of the stream while it is discharging water?

Answer 39

Deluge set

Question 40

Which of the following statements about elevating platform master streams is FALSE?

Answer 40

A. They are basically similar to those with preplumbed aerial ladders. B. They are generally attached to the pump with 2½-inch (65 mm) fire hoselines.* C. Some are equipped with two master streams on one platform, giving flexibility during large-scale fire operations. D. They are different from preplumbed aerial ladders in that they are located on the aerial platform and can be more easily maneuvered by firefighters at the tip of the aerial device.

Question 41

Ladder pipes can move:

Answer 41

vertically.

Question 42

Which types of special purpose nozzle are also called distributors?

Answer 42

Cellar nozzles

Question 43

Which type of special purpose nozzle is decreasing in use?

Answer 43

Water curtain nozzle

Question 44

Which type of special purpose nozzle is commonly used in aircraft fire fighting and to apply water to areas what are otherwise inaccessible to water streams?

Answer 44

Piercing nozzle

Question 45

Which type of special purpose nozzle produces a fan-shaped stream intended to protect combustible materials from the heat of an adjacent fire?

Answer 45

Water curtain nozzle

Question 46

Which type of special purpose nozzle is designed to be placed on the end of a booster hose?

Answer 46

Chimney nozzle

Question 47

Which type of special purpose nozzle can be lowered through holes cut in the floor or ceiling?

Answer 47

Cellar nozzle

Question 48

Which type of special purpose nozzle may be used to deliver AFFF to a confined area?

Answer 48

Piercing nozzle

Question 49

Which type of special purpose nozzle produces a very fine, misty fog cone?

Answer 49

Chimney nozzle

Question 50

Which type of special purpose nozzle may be used to protect firefighters from heat, but must cover a wide area and be reasonably heavy to be effective?

Answer 50

Water curtain nozzle

Question 51

Which type of special purpose nozzle has a pointed end and a driving end?

Answer 51

Piercing nozzle

Question 52

Which type of special purpose nozzle may or may not be equipped with shutoffs?

Answer 52

Cellar nozzle

Question 53

Which type of special purpose nozzle is only effective in absorbing convected heat from a fire?

Answer 53

Water curtain nozzle

Question 54

Which type of special purpose nozzle generally produces only 1.5 to 3 gpm (6 L/min to 12 L/min) at a nozzle pressure of 100 psi (700 kPa)?

Answer 54

Chimney nozzle

Question 55

Which type of special purpose nozzle is generally a 3- to 6-foot (1 m to 2 m) hollow steel rod 1½-inches (38 mm) in diameter?

Answer 55

Piercing nozzle

Question 56

Nozzle reaction is:

Answer 56

the force pushing back on firefighters as water is discharged from a nozzle at a given pressure.

Question 57

Nozzle reaction illustrates ___: For every action there is an equal and opposite reaction.

Answer 57

Newton's Third Law of Motion

Question 58

Nozzle reaction forces firefighters to ___ the amount of nozzle pressure that can be supplied to an attack line.

Answer 58

limit