Ch. 7: Fire Hose Nozzles and Flow Rates

Question 1

What can be defined as a stream of water or other extinguishing agent after it leaves a nozzle until it reaches the desired point?

Answer 1

a fire stream

Question 2

What three basic types of fire streams does the fire service utilize?

Answer 2

solid, fog, broken

Question 3

What is a fire stream produced from a fixed orifice, smoothbore nozzle?

Answer 3

a solid stream

Question 4

What is 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?

Answer 4

solid stream nozzles

Question 5

What may be produced by deflection at the periphery or by impinging jets of water or by a combination of these?

Answer 5

a fog stream

Question 6

What is directly dependent on the width of the stream, the size of the water droplets, wind, and the amount of water flowing?

Answer 6

the reach of the fog stream

Question 7

What are designed to flow a specific amount of water at a specific nozzle discharge pressure on all stream patterns?

Answer 7

constant flow nozzles

Question 8

What are designed to be placed on attack lines that can be easily maneuvered by firefighters?

Answer 8

handline nozzles

Question 9

What is the maximum amount of water that can safely flow through a handline nozzle?

Answer 9

350 gpm

Question 10

What is applied to any fire stream that is too large to be controlled without mechanical aid?

Answer 10

master stream

Question 11

What doesn’t just deliver large volumes of water but also have a greater reach than handheld streams?

Answer 11

master streams

Question 12

What are the three basic types of monitors?

Answer 12

fixed, portable, and combination

Question 13

What allows the stream direction and angle to be changed while water is being discharged?

Answer 13

a monitor

Question 14

What is mounted on a fire apparatus deck and is connected directly to the pump by permanent piping?

Answer 14

a turret pipe

Question 15

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

Answer 15

deluge set

Question 16

What are those large-capacity nozzles that are designed to be placed on the end of an aerial device?

Answer 16

elevated master stream

Question 17

What is a master stream device used in conjunction with aerial ladders?

Answer 17

a ladder pipe

Question 18

What is known as the counterforce as water is discharged from a nozzle at a given pressure, a force pushes back on the firefighters handling the hoseline?

Answer 18

nozzle reaction

Question 19

The fire stream produced from a fixed orifice, smoothbore nozzle is known as a -

Answer 19

Solid stream

Question 20

What determines the flow from a solid stream nozzle?

Answer 20

• Nozzle pressure

- Size of the discharge opening

Question 21

When solid streams are used as handlines they should be operated at which a the following nozzle pressures?

Answer 21

50 psi.

Question 22

When solid streams are used as master streams they should be operated at which a the following nozzle pressures?

Answer 22

80 psi.

Question 23

To strike or dash about or against, clashing with the sharp collision, or to come together with force; best describes which of the following?

Answer 23

Impinge.

Question 24

The line bounding a rounded surface or the outward boundary of an object distinguish from its internal regions best describes which a the following?

Answer 24

Periphery.

Question 25

A turning or state of being turned, a turning from a straight line or given course, or a bending or a deviation best describes which of the following?

Answer 25

Deflection.

Question 26

A fog stream nozzle that drives several jets of water together at a set angle to break the water up into finely divided particles is called a -

Answer 26

Impinging stream.

Question 27

__ are produced by deflecting water from the periphery to an inside circular stem in a periphery-deflected fog nozzle.

Answer 27

Periphery-deflected streams

Question 28

The reach of any fog stream is directly dependent on which of the following?

Answer 28

- The width of the stream. - The size of the water droplets and the wind. - The volume of water flowing.

Question 29

Nozzles that are designed to flow a specific amount of water at a specific nozzle discharge pressure on all stream patterns are called -

Answer 29

Constant flow nozzles.

Question 30

Most constant flow nozzles are intended to be operated at a nozzle pressure of -

Answer 30

100 psi.

Question 31

A nozzle that has a number of constant flow settings, enabling the firefighter to select a flow rate that best suits the existing conditions is called -

Answer 31

Manually adjusted nozzles.

Question 32

Which of the following nozzles is also referred to as constant pressure nozzles?

Answer 32

Automatic nozzles.

Question 33

If the gallonage supplied to an automatic nozzle changes, the automatic nozzle -

Answer 33

Maintains approximately the same nozzle pressure and pattern.

Question 34

An automatic nozzle -

Answer 34

Will maintain a constant nozzle pressure of approximately 100 PSI, no matter how much the pump discharge pressure is delivering.

Question 35

High-pressure fog nozzles are designed to operate at pressures up to -

Answer 35

800 psi.

Question 36

High-pressure fog nozzles are best used for fighting which a the following types of fires?

Answer 36

Wildland fires

Question 37

High-pressure fog nozzles generally only flow -

Answer 37

8 to 15 gpm.

Question 38

What is the maximum amount of water that can be safely flowed through a handline nozzle?

Answer 38

350 gpm.

Question 39

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

Answer 39

Masters streams.

Question 40

Solid master streams are usually operated at -

Answer 40

80 psi

Question 41

Fog master streams are usually operated at -

Answer 41

100 psi

Question 42

Master streams normally have a flow rate of -

Answer 42

350 gpm or greater.

Question 43

Master streams are normally used under all the following circumstances except for -

Answer 43

When water supplies are limited.

Question 44

Which of the following would constitute the basic categories of master stream devices?

Answer 44

(1) Monitor (2) Deluge set (3) Turret pipe (4) Elevated master stream

Question 45

A(n) __ consists of a short length of large diameter hose that has a large nozzle or large playpipe supported at the discharge end by a tripod.

Answer 45

Deluge set.

Question 46

A(n) __ is mounted on the fire apparatus deck and is connected directly to the pump by permanent pipe

Answer 46

Turret pipe.

Question 47

Monitors are often incorrectly referred to as deluge sets. Monitors differ from deluge sets in which of the following ways?

Answer 47

With monitors, stream direction and angle can be changed while water is being discharged.

Question 48

Which of the following would not be considered one of the three basic types of monitors?

Answer 48

Automatic.

Question 49

Which of the following types of master streams is often referred to as the deck gun or deck pipe?

Answer 49

Turret pipe.

Question 50

The Ladder Pipe would be considered which of the following types of masters streams?

Answer 50

Elevated master stream.

Question 51

What size diameter hose normally supplies ladder pipes?

Answer 51

3 inch.

Question 52

Ladder pipes can be controlled by firefighters at the tip of the ladder.

Answer 52

Also by using a rope from the ground.

Question 53

The movement of ladder pipes is limited to vertical up and down movements.

Answer 53

Moving the ladder pipe in a horizontal way can place dangerous stress on the aerial ladder.

Question 54

Cellar nozzles, water-curtain nozzles, piercing nozzles, and chimney nozzles are all considered

Answer 54

Broken stream nozzles.

Question 55

Also known as distributors, this nozzle can be lowered through holes or through some other suitable opening.

Answer 55

Cellar nozzle.

Question 56

Which of the following nozzles is often used to protect exposures?

Answer 56

Water curtain nozzle.

Question 57

Chimney nozzles have a normal operating pressure of -

Answer 57

100 psi.

Question 58

Chimney nozzles will deliver __ in a very fine, misty fog cone.

Answer 58

1.5 - 3 gpm

Question 59

Piercing nozzles are capable of delivering __ of water.

Answer 59

100 gpm.

Question 60

As firefighters discharge water from the nozzle at a given pressure, a force pushes back upon the firefighters who are handling the hoseline. This counterforce is known as -

Answer 60

Nozzle reaction.

Question 61

According to IFSTA, tests have revealed that the practical working limits for velocity of fire streams are within __ feet per second.

Answer 61

60 - 120.

Question 62

When it comes to approximating the Nozzle Reaction (NR) on the fireground of a solid stream, the rule-of-thumb is to use the following formula -

Answer 62

NR = Nozzle Reaction Q = Total Flow Through Nozzle NP = Nozzle Pressure NR = Q/3