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IFSTA Exam Prep > Ch 6. Hose Nozzle And Flow Rates > Flashcards

Ch 6. Hose Nozzle And Flow Rates Flashcards

1
Q

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

A

Solid stream nozzle

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2
Q

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

A

Nozzle pressure

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3
Q

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

A

50

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4
Q

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

A

80 psi

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5
Q

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

A

29.7

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6
Q

Periphery deflected streams are produced by deflecting water around_______?

A

An inside circular stem in the nozzle

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7
Q

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

A

Impinging stream

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8
Q

Impinging stream nozzles most often provide what type of pattern?

A

Wide angle fog pattern

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9
Q

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

A

The wind

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10
Q

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

A

Constant flow fog nozzle

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11
Q

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

A

Selectable gallonage nozzle

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12
Q

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

A

Constant flow nozzle

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13
Q

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

A

Automatic fog nozzle

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14
Q

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

A

Adjust to maintain virtually the same pressure

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15
Q

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

A

High pressure fog nozzles

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16
Q

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

A

Wildland fires

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17
Q

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

A

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

18
Q

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

A

They generate considerable nozzle reaction due to the high flow rate

19
Q

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

A

Master streams

20
Q

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

A

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

21
Q

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

A

While water is being discharged

22
Q

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

A

Combination monitor

23
Q

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

A

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

24
Q

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

A

Cellar nozzle

25
Q

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

A

Cellar nozzle

26
Q

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?

A

Piercing nozzles

27
Q

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

A

Piercing nozzle

28
Q

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?

A

Chimney nozzles

29
Q

What is the definition of nozzle reaction?

A

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

30
Q

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.

A

At or below 100 psi

31
Q

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

A

1.57 x d2 x NP

32
Q

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

A

0.0015 x d2 x NP

33
Q

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 __________

A

NR=Q/3

*Smoothbore quick math

34
Q

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

A

.0505 x Q x (sq root NP)

35
Q

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

A

0.0156 x Q x (sq root NP)

36
Q

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

A

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

37
Q

What is a fixed monitor?

A

Commonly called deck guns and Are permanently mounted on the apparatus

38
Q

What are combination monitors?

A

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.

39
Q

What are portable monitors?

A

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

40
Q

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

A

Limited to a vertical up and down motion

IFSTA Exam Prep (20 decks)

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