Pump Ops Chpt 6

Question 1

The fire service operates three types of nozzles to produce three basic fire streams: _____,_______, and _____.

Answer 1

Solid, fog, and broken steams

Question 2

A ________ is produced with a fixed orifice and a smooth bore nozzle. The stream is tight with little spray or shower effect.

Answer 2

Solid fire stream

Question 3

On handlines should generally be operated at a maximum of _____ nozzle pressure, while master stream appliances should be operated at a maximum______.

Answer 3

50 psi and 80 psi

Question 4

GPM = 29.7 x D2 x NP

Answer 4

Gpm = discharge in gallons per minute

29.7 = a constant

D = diameter of orifice in inches

NP = nozzle pressure

Question 5

A _________ may be produced by deflection at the periphery, by impinging jets of water, or a combination of these methods.

Answer 5

Fog stream

Question 6

Periphery deflected streams are produced by deflecting water around an inside circular stem in the nozzle. The water is then deflected by the exterior barrel of the nozzle. The position of the stem relative to the barrel will determine the shape of the _______

Answer 6

Fog stream

Question 7

Is designed to flow a specific volume of water on all stream patterns at a specific nozzle discharge pressure.

Answer 7

A constant flow nozzle

Question 8

Most _______ are designed to operate at a nozzle pressure of 100 psi. However some nozzles may operate at 50 or 75 psi.

Answer 8

Constant flow nozzles

Question 9

These nozzles allow the firefighter operating the handline to select the flow rate to suit fire and operating conditions.

Answer 9

Selectable gallonage nozzles

Question 10

Are a type of variable flow nozzle with the ability to change patterns while maintaining the same nozzle pressure.

Answer 10

Automatic fog nozzle

Question 11

Operating at a pressure of up to _____ high pressure fog nozzles produce a stream with significant forward velocity but relatively low volume of water delivery.

Answer 11

800 psi

Question 12

These nozzles are best suited for wildland fires and are not recommend for structural fire fighting due to their low water flow of only _____ to ____ gpm

Answer 12

8 to 15 gpm 30L/min to 60L/min

Question 13

Generally, _____ is the maximum flow for a handline

Answer 13

350 gpm

Question 14

Are capable of water flow in excess of 350 gpm and must be properly secured to a safe position. These appliances may produce solid or fog streams and generate considerable nozzle reaction due to their higher flow rate.

Answer 14

Master stream nozzles

Question 15

Are generally operated during incidents where handlines would be ineffective, conditions require a defensive posture, or personnel are limited.

Answer 15

Master stream appliances

Question 16

Commonly called deck guns and permanently mounted on the apparatus

Answer 16

Fixed monitors

Question 17

Maybe used in a mount on the apparatus or removed and used remotely from the vehicle.

Answer 17

Combination monitors

Question 18

Stored on the apparatus for deployment to the location where they will be used.

Answer 18

Portable monitors

Question 19

Are most often lowered through holes or other openings to the cellar of an occupancy. These devices may also be deployed for attic or other void space fires.

Answer 19

Cellar nozzles

Question 20

Also called ________ are commonly used in aircraft firefighting, car fires, or to apply water to voids, attics, or their areas inaccessible to standard fire streams.

Answer 20

Piercing nozzles

Question 21

The piercing nozzle is generally designed as _____ to _____ hollow steel rod ______ in diameter.

Answer 21

3 to 6 ft 1 1/2 inches in diameter

Question 22

Designed to suppress fires in chimney flues, the_______ is supplied by a booster hose. The device consists of a solid piece of brass or steel with many small impinging holes. Flowing only ____ to _____ at a nozzle pressure of______psi the impinging holes of the _______ produce a very fine mist which turns to steam in the hot interior of the chimney.

Answer 22

Chimney nozzles

Flowing 1.5 to 3 GPM

100 psi

Question 23

This _______ illustrates Newton’s third law of motion: for every action there is an opposite equal reaction

Answer 23

Nozzle reaction

Question 24

Nozzle reaction for solid stream nozzles

NR = 1.57 x D2 x NP

Answer 24

NR nozzle reaction in pounds

1.57 a constant

d nozzle diameter

NP nozzle pressure per square inch

Question 25

A simple guideline for the customary system of measurement is ______ this may be used to achieve the approximate solid stream nozzle reaction on the fire ground.

Answer 25

NR = Q/3

Question 26

Nozzle reaction for fog stream nozzles NR = 0.0505 x Q x NP

Answer 26

NR nozzle reaction in pounds 0.0505 a constant Q total flow through the nozzle in gallons per minute NP nozzle pressure in pounds per square inch

Question 27

A simple guideline for the customary system of the measurement is _______. This may be used to achieve the approximate for stream nozzle reaction on the fire ground.

Answer 27

NR= Q/2

Question 28

Solid stream nozzles on handlines should generally be operated at a maximum of

Answer 28

50 psi

Question 29

Although a narrow pattern is possible, impinging stream nozzles most often provide a

Answer 29

Wide angle fog pattern

Question 30

When operating a _______, the driver operator sets its discharge gallonage with a specified range before use

Answer 30

Selectable gallonage nozzle

Question 31

Adjust to fluctuating water flow to maintain effective pressure and a consistent fire stream in all flow ranges

Answer 31

Automatic nozzles

Question 32

Smooth bore streams are generally operated at ____

Answer 32

80 psi master stream

Question 33

While fog appliances are generally operated at

Answer 33

100 psi

Question 34

As water is discharged from a nozzle at a given pressure, a counterforce pushes back against firefighters operating a hoseline. This force, called

Answer 34

Nozzle reaction