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DE STUDY > Chapter 6 > Flashcards

Chapter 6 Flashcards

1
Q

1.​A solid stream nozzle produces a fire stream that has a: (194)
​A.​tight stream and little spray or shower effect.
​B.​variable stream with little spray or shower effect.
​C.​wide stream with intermittent spray or shower effect.
​D.​tight stream that has significant spray or shower effect.

A

​A.​tight stream and little spray or shower effect.

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2
Q

2.​A solid stream nozzle is designed so that the volume of water flowing through the nozzle: (194)
​A.​is intermittent and reaches the orifice in bursts.
​B.​is gradually reduced until just before the orifice.
​C.​is gradually increased until just before the orifice.
​D.​may either increase or decrease before the orifice.

A

​B.​is gradually reduced until just before the orifice.

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3
Q

3.​Which factor BEST determines the flow and reach of a solid stream? (194)
​A.​Water piping and connections
​B.​Age of nozzle and firefighter training
​C.​Ambient temperature and wind direction
​D.​Nozzle pressure and size of the discharge orifice

A

​D.​Nozzle pressure and size of the discharge orifice

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4
Q

4.​Solid stream nozzles on handlines should generally be operated at a maximum of: (194)
​A.​20 psi (140 kPa) nozzle pressure.
​B.​30 psi (210 kPa) nozzle pressure.
​C.​50 psi (350 kPa) nozzle pressure.
​D.​80 psi (560 kPa) nozzle pressure.

A

​C.​50 psi (350 kPa) nozzle pressure.

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5
Q

5.​Master stream appliances should be operated at a maximum of: (194)
​A.​50 psi (350 kPa).
​B.​80 psi (560 kPa).
​C.​110 psi (760 kPa).
​D.​150 psi (1050 kPa).

A

​B.​80 psi (560 kPa).

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6
Q

6.​Which is a reason that driver/operators may need to determine the amount of water discharged from a solid stream nozzle? (194-195)
​A.​Determine cost of water per minute flowing
​B.​Verify that the nozzle discharges stamped amount
​C.​Calculate amount of foam solution to add to the nozzle
​D.​Test the water supply when a nozzle is attached to a hydrant

A

​D.​Test the water supply when a nozzle is attached to a hydrant

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7
Q

7.​Which is the customary formula for discharge rate? (195)
​A.​GPM= 29.7 x d2 x √NP
​B.​GPM= 14.7 x d2 x √NP
​C.​GPM= d2 x √NP x 1.7
​D.​GPM= d2 x √NP x 2.5

A

​A.​GPM= 29.7 x d2 x √NP

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8
Q

8.​Which is a constant in the metric formula for discharge rate? (195)
​A.​0.03
​B.​0.067
​C.​0.096
​D.​1.75

A

​B.​0.067

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9
Q

9.​Which manner of producing fog streams occurs by deflecting water around an inside circular stem in the nozzle? (196)
​A.​Circular stream nozzles
​B.​Impinging stream nozzles
​C.​Pressure-deflected streams
​D.​Periphery-deflected streams

A

​D.​Periphery-deflected streams

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10
Q

10.​Which pattern is MOST often provided by impinging stream nozzles? (196)
​A.​Solid stream
​B.​Variable stream
​C.​Wide-angle fog pattern
​D.​Narrow-angle fog pattern

A

​C.​Wide-angle fog pattern

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11
Q

11.​What directly affects the reach of the fog stream? (197)
​A.​Ambient temperature
​B.​Stage of fire growth
​C.​Number of personnel
​D.​Volume of water flowing

A

​D.​Volume of water flowing

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12
Q

12.​Which nozzle is designed to flow a specific volume of water on all stream patterns at a specific nozzle discharge pressure? (197)
​A.​Automatic fog nozzle
​B.​Constant flow fog nozzle
​C.​High pressure fog nozzle
​D.​Selectable gallonage nozzle

A

​B.​Constant flow fog nozzle

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13
Q

13.​Which nozzle is designed to allow the firefighter operating the handline to select a flow rate to suit the fire and operating conditions? (197)
​A.​Automatic fog nozzle
​B.​Constant flow fog nozzle
​C.​High pressure fog nozzle
​D.​Selectable gallonage nozzle

A

​D.​Selectable gallonage nozzle

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14
Q

14.​Which is a type of variable flow nozzle with the ability to change patterns while maintaining the same nozzle pressure? (198)
​A.​Automatic fog nozzle
​B.​Constant flow fog nozzle
​C.​High pressure fog nozzle
​D.​Selectable gallonage nozzle

A

​A.​Automatic fog nozzle

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15
Q

15.​What happens to an automatic nozzle when the pump discharge pressure rises above the constant operating pressure? (199)
​A.​Automatic nozzle stops functioning efficiently
​B.​Automatic nozzle increases its operating pressure to match that of the pump discharge
​C.​Automatic nozzle decreases its operating pressure to compensate for the pump discharge
​D.​Automatic nozzle maintains its constant operating pressure, within the limitation of its design

A

​D.​Automatic nozzle maintains its constant operating pressure, within the limitation of its design

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16
Q

16.​High pressure fog nozzles are BEST suited for: (199)
​A.​wildland fires.
​B.​structural fires.
​C.​multiple alarm fires.
​D.​hazardous materials fires.

A

​A.​wildland fires.

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17
Q

17.​High pressure fog nozzles: (199)
​A.​have very little forward velocity.
​B.​produce a stream of slow-moving large spray.
​C.​have a relatively low volume of water delivery.
​D.​have a relatively high volume of water delivery.

A

​C.​have a relatively low volume of water delivery.

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18
Q

18.​Generally, the maximum flow for a handline is 350 gpm (1 400 L/min) because greater flows will: (199)
​A.​cause the nozzle to malfunction.
​B.​require the nozzle to be replaced during fire fighting efforts.
​C.​place too much strain on the water supply system and nozzle itself.
​D.​produce a nozzle reaction that is difficult or dangerous for firefighters to handle.

A

​D.​produce a nozzle reaction that is difficult or dangerous for firefighters to handle.

19
Q

19.​Master stream nozzles would MOST likely be used at an incident where: (199)
​A.​handlines would be ineffective.
​B.​water flow can be relatively low.
​C.​extra personnel are available.
​D.​conditions require an offensive posture.

A

​A.​handlines would be ineffective.

20
Q

20.​Which is a characteristic of master stream nozzles? (199)
​A.​Designed to be used from a mobile position
​B.​Require considerable personnel for operation
​C.​Generate little nozzle reaction even at higher flow rates
​D.​Offer ability to operate at a greater distance from the fire

A

​D.​Offer ability to operate at a greater distance from the fire

21
Q

21.​Which statement about master stream appliances is MOST accurate? (200)
​A.​Only fixed monitors are able to change the stream direction or angle while water is being discharged.
​B.​Each type of monitor cannot change the stream direction or angle while water is being discharged.
​C.​Each type of monitor has ability to change the stream direction or angle while water is being discharged.
​D.​Only combination monitors are able to change the stream direction or angle while water is being discharged.

A

​C.​Each type of monitor has ability to change the stream direction or angle while water is being discharged.

22
Q

22.​Pre-piped waterways on elevated master streams generally feature a master stream that may be remotely controlled from the apparatus turntable, and is generally able to move: (200)
​A.​only up and down.
​B.​only side to side up to 30 degrees.
​C.​both up and down and side to side.
​D.​ten degrees from initial position that was set.

A

​C.​both up and down and side to side.

23
Q

23.​Which nozzle may also be referred to as a distributor? (200)
​A.​Cellar nozzle
​B.​Broken nozzle
​C.​Piercing nozzle
​D.​Chimney nozzle

A

A.​Cellar nozzle

24
Q

24.​Which nozzle may require insertion of an inline shut off valve at a location back from the nozzle to increase safety and ease of operation? (201)
​A.​Cellar nozzle
​B.​Broken nozzle
​C.​Piercing nozzle
​D.​Chimney nozzle

A

​A.​Cellar nozzle

25
Q

25.​Which nozzle is commonly used in aircraft fire fighting or to apply water to voids, attics, or other areas inaccessible to standard fire streams? (201)
​A.​Cellar nozzle
​B.​Broken nozzle
​C.​Piercing nozzle
​D.​Chimney nozzle

A

​C.​Piercing nozzle

26
Q

26.​Which nozzle consists of a solid piece of brass or steel with many small impinging holes that produce a very fine mist? (201)
​A.​Cellar nozzle
​B.​Broken nozzle
​C.​Piercing nozzle
D.​Chimney nozzle

A

D.​Chimney nozzle

27
Q

27.​Nozzle reaction occurs as water is discharged from a nozzle at a given pressure and: (202)
​A.​a forward pressure pulls firefighters operating the hoseline.
​B.​the resulting vibration of water against the nozzle damages the hose.
​C.​firefighters anticipating the water discharge hold the nozzle stationary.
​D.​a counterforce pushes back against firefighters operating the hoseline.

A

​D.​a counterforce pushes back against firefighters operating the hoseline.

28
Q

28.​Why are most fog nozzles designed to operate at or below 100 psi (700 kPa) nozzle pressure? (202)
​A.​Above this pressure, handlines will produce erratic fire streams.
​B.​Above this pressure, nozzles will likely separate from the hose couplings.
​C.​Above this pressure, pump discharges will not keep up with needed supply.
​D.​Above this pressure, handlines become unwieldy for firefighters attempting fire suppression operations.

A

​D.​Above this pressure, handlines become unwieldy for firefighters attempting fire suppression operations.

29
Q

29.​Which is the customary formula for determining nozzle reaction for solid stream nozzles? (203)
​A.​NR = d² x NP
​B.​NR = 1.57 x d² x NP
​C.​NR = 0.057 x d² x NP
​D.​NR = 29.7 x d2 √NP

A

​B.​NR = 1.57 x d² x NP

30
Q

30.​Which is a simple guideline for the customary system of measurement that may be used to achieve approximate solid stream nozzle reaction on the fireground? (203)
​A.​NR = Q/2
​B.​NR = Q/3
​C.​NR = Q x 1.5
​D.​NR = Q x 2.7

A

​B.​NR = Q/3

31
Q

31.​Which is the customary formula for nozzle reaction for a fog stream nozzle? (204)
​A.​NR = Q x √NP
​B.​NR = 0.025 x Q x √NP
​C.​NR = 0.0505 x Q x √NP
​D.​NR = 0.50 x Q x √NP

A

​C.​NR = 0.0505 x Q x √NP

32
Q

32.​In the metric formula for nozzle reaction for a fog stream nozzle, what does Q stand for? (204)
​A.​Nozzle reaction in Newtons (N)
​B.​Nozzle pressure in kilopascals (kPa)
​C.​The sum of nozzle reaction and nozzle pressure
​D.​Total flow through the nozzle in liters per minute (L/min)

A

​D.​Total flow through the nozzle in liters per minute (L/min)

33
Q

1.​Which factor MOST determines the flow and reach of a solid stream? (194)
​A.​Water source
​B.​Fire conditions
​C.​Length of hose lay
​D.​Size of the discharge orifice

A

​D.​Size of the discharge orifice

34
Q

2.​Impinging stream nozzles MOST often provide a: (196)
​A.​straight stream.
​B.​wide-angle fog pattern.
​C.​combination fog pattern.
​D.​narrow-angle fog pattern.

A

​B.​wide-angle fog pattern.

35
Q

3.​A constant flow fog nozzle is designed to: (197)
​A.​provide a relatively low volume of water delivery.
​B.​change patterns while also changing nozzle pressure.
​C.​allow the firefighter operating the handline to select flow rate to suit the fire and operating conditions.
​D.​flow a specific volume of water on all stream patterns at a specific nozzle discharge pressure.

A

​D.​flow a specific volume of water on all stream patterns at a specific nozzle discharge pressure.

36
Q

4.​An automatic fog nozzle is designed to: (198)
​A.​provide a relatively low volume of water delivery.
​B.​change patterns while maintaining the same nozzle pressure.
​C.​flow a specific volume of water on all stream patterns at a specific nozzle discharge pressure.
​D.​allow the firefighter operating the handline to select flow rate to suit the fire and operating conditions.

A

​B.​change patterns while maintaining the same nozzle pressure.

37
Q

5.​A high pressure fog nozzle is designed to: (199)
​A.​provide a relatively low volume of water delivery.
​B.​produce a stream that has very little forward velocity.
​C.​provide efficient water flow at structural fire fighting.
​D.​change patterns while maintaining the same nozzle pressure.

A

​A.​provide a relatively low volume of water delivery.

38
Q

6.​If handlines would be ineffective at an incident, which would be the BEST option? (199)
​A.​Use master stream nozzles.
​B.​Increase water pressure to handlines.
​C.​Allow the the fire to burn out on its own.
​D.​Use handlines on a smaller area of the fire.

A

A.​Use master stream nozzles.

39
Q

7.​A nozzle that is commonly used in aircraft fire fighting or to apply water to voids, attics, or other areas inaccessible to standard fire streams is called a: (201)
​A.​cellar nozzle.
​B.​piercing nozzle.
​C.​impinging nozzle.
​D.​combination nozzle.

A

​B.​piercing nozzle.

40
Q

8.​Which term refers to a counterforce that pushes back against firefighters operating the hoseline? (202)
​A.​Water hammer
​B.​Nozzle reaction
​C.​Residual pressure
​D.​Kickback pressure

A

​B.​Nozzle reaction

41
Q

9.​What is the formula for the customary discharge rate? (195)

A

GPM = 29.7 x dx2 √NP

42
Q

10.​​What are the three types of master stream appliances? (200)

A

Fixed, combination, and portable

43
Q

11.​​In the formula for nozzle reaction for solid stream nozzles (customary), NR = 1.57 x d2 x NP, explain the meaning of NR, d, and NP. (203)

A

NR = Nozzle Reaction in pounds (lb); d = Nozzle diameter in inches; NP = Nozzle Pressure in pounds per square inch (psi)

44
Q

12.​In the formula for nozzle reaction for fog stream nozzles (metric), NR = 0.0156 x Q x √NP, explain the meaning of Q and NP. (204)

A

Q = Total flow through the nozzle in liters per minute (L/min); NP = Nozzle Pressure in kilopascals (kPa)

DE STUDY (22 decks)

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