Ch 6. Hose Nozzle And Flow Rates

Question 1

Which type of nozzle produces a tight stream with a little spray or shower effect?

Answer 1

Solid stream nozzle

Question 2

The flow and reach of a solid stream nozzle is determined by the size of the discharge orifice and the _______?

Answer 2

Nozzle pressure

Question 3

Solid stream nozzles on hand lines should generally be operated at a maximum of _________psi

Answer 3

50

Question 4

At what maximum pressure should solid stream master stream appliances be operated?

Answer 4

80 psi

Question 5

When determining the flow of a solid stream nozzle, what is the constant number in the customary formula?

Answer 5

29.7

Question 6

Periphery deflected streams are produced by deflecting water around_______?

Answer 6

An inside circular stem in the nozzle

Question 7

What type of fog stream brakes water into fine, evenly divided particles by driving several jets of water together at an angle?

Answer 7

Impinging stream

Question 8

Impinging stream nozzles most often provide what type of pattern?

Answer 8

Wide angle fog pattern

Question 9

What environmental factor is directly related to the reach of a fog stream?

Answer 9

The wind

Question 10

What type of nozzle is designed to flow a specific volume of water on all stream patterns at a specific nozzle pressure discharge?

Answer 10

Constant flow fog nozzle

Question 11

What type of nozzle allows the firefighter operating the handline to select the flow rate to suit fire and operating conditions?

Answer 11

Selectable gallonage nozzle

Question 12

When properly supplied, both a selectable gallonage nozzle and a _______ nozzle will discharge predetermined gallonage

Answer 12

Constant flow nozzle

Question 13

A type of variable flow nozzle with the ability to change patterns while maintaining the same nozzle pressure is called a?

Answer 13

Automatic fog nozzle

Question 14

If the gallonage supplied to an automatic fog nozzle changes, the automatic nozzle will _________.

Answer 14

Adjust to maintain virtually the same pressure

Question 15

What type of nozzle produces a stream with significant forward velocity in relatively low volume of water delivery?

Answer 15

High pressure fog nozzles

Question 16

What type of fire would high-pressure fog nozzles be best suited for?

Answer 16

Wildland fires

Question 17

Why is 350 GPM generally the maximum flow for a hand line?

Answer 17

Greater flows will produce a nozzle reaction that is difficult or dangerous for firefighters to handle

Question 18

What is true about Nozzle reaction due to higher flow rate in Master streams?

Answer 18

They generate considerable nozzle reaction due to the high flow rate

Question 19

What type of stream is most likely to be used in incidents that require an defensive posture?

Answer 19

Master streams

Question 20

What is an advantage to a master stream in regards to distance from the fire building?

Answer 20

Master streams offer the ability to operate at a greater distance from the fire

Question 21

Each type of Master Stream monitor has the ability to change the stream direction or angle ____________?

Answer 21

While water is being discharged

Question 22

What type of master stream appliance often has flow limitations when removed from the apparatus and placed on the ground?

Answer 22

Combination monitor

Question 23

In what directions can an elevated master stream that has a pre-piped waterway generally control their nozzle while operating remotely from the turntable?

Answer 23

The nozzle can move both up and down and side to side

Question 24

A special purpose nozzle that may be referred to as a distributor nozzle is called a ________?

Answer 24

Cellar nozzle

Question 25

What type of nozzle is a special purpose nozzle that is often lowered through holes or other openings into the seller of an occupancy?

Answer 25

Cellar nozzle

Question 26

What type of special purpose nozzle is commonly used in aircraft fire fighting, car fires, or to apply water to voids, attics, or other areas inaccessible to standard for streams?

Answer 26

Piercing nozzles

Question 27

What type of nozzle has a hardened steel point capable of being driven through a variety of materials such as concrete blocks?

Answer 27

Piercing nozzle

Question 28

What type of special purpose nozzle consists of a solid piece of brass or steel with many small impinging holes that produce a very fine mist?

Answer 28

Chimney nozzles

Question 29

What is the definition of nozzle reaction?

Answer 29

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

Question 30

Because handlines may become unwieldy for firefighters attempting to advance in maneuver during fire suppression operations, most fog nozzles are designed to be operated at __________psi.

Answer 30

At or below 100 psi

Question 31

What is the CUSTOMARY formula for calculating nozzle reaction for solid stream nozzles?

Answer 31

1.57 x d2 x NP

Question 32

What is the METRIC formula for calculating nozzle reaction for solid stream nozzles?

Answer 32

0.0015 x d2 x NP

Question 33

A rule of thumb for calculating nozzle reaction for solid stream nozzles in the customary system is Nozzle Reaction (NR) = the total flow of water in GPM flowing through the nozzle (Q) divided by __________

Answer 33

NR=Q/3 *Smoothbore quick math

Question 34

What is the CUSTOMARY formula for calculating nozzle reaction when using fog stream nozzles?

Answer 34

.0505 x Q x (sq root NP)

Question 35

What is the METRIC formula for calculating nozzle reaction for fog stream nozzles?

Answer 35

0.0156 x Q x (sq root NP)

Question 36

What is unique about special purpose nozzles in regards to NFPA 1901?

Answer 36

Special purpose nozzles are not required as a standard list of pumping apparatus equipment

Question 37

What is a fixed monitor?

Answer 37

Commonly called deck guns and Are permanently mounted on the apparatus

Question 38

What are combination monitors?

Answer 38

May be mounted on the apparatus or removed to use remotely from the vehicle. Often have flow limitations when removed from apparatus and placed on ground.

Question 39

What are portable monitors?

Answer 39

Monitors that are stored on the apparatus for deployment to the location where they are to be used.

Question 40

When using a detachable ladder pipe from an aerial ladder, movement of water pipes is limited to what directions?

Answer 40

Limited to a vertical up and down motion