Chapter 6

Question 1

Driver must be knowledgeable about the capabilities of each hand-line,nozzle and master stream appliance on the Apparatus in order to provide

Answer 1

Proper pressure and volume of water

Question 2

What affect the condition of the stream as it leaves the nozzle

Answer 2

1. Operating pressure
2. nozzle design and adjustment
3. condition of the nozzle orifice

Question 3

Upon leaving the nozzle orifice water forms a

Answer 3

Fire stream

Question 4

Until it reaches its destination, the fire stream is influenced by

Answer 4

1. Velocity
2. gravity
3. friction with the air
4. wind

Question 5

Driver operator must ensure that the optimum flow rate and discharge pressure are applied to each fire stream in order to achieve

Answer 5

Maximum efficiency during incident operation

Question 6

Three types of nozzles to produce basic fire streams are

Answer 6

1. Broken stream
2. fog
3. solid

Question 7

Fog stream

Answer 7

Water stream of finely divided particles used for fire control

Question 8

In order for a stream of water to be broken into finely divided particles it must be

Answer 8

Driven against an obstruction with sufficient force to diffuse the water and shatter the mass

Question 9

Variety of fog stream nozzles are

Answer 9

1. Constant Flow Nozzle:
   - flow a specific volume of water
   - a periphery deflected stream
   - equipped with an adjustable pattern range
   - Most designed to operate at 100 psi
   - Some may operate at 50 to 75 psi
2. Selectable Gallonage:
   - Allow FF to set select flow rate
   - Driver Must know the gallonage setting in which the nozzle will be operating in order to properly calculate the friction loss and determine appropriate pump discharge pressure.
3. Automatic Fog Nozzle:
   - Ability to change pattern while maintaining the same nozzle pressure.
4. High pressure fog nozzle:
   - Produce stream with significant forward velocity with relatively low volume of water delivery
   - Recommended for wildland fire but not structure fire
   - 800 psi with flow rate 8 to 15 GPM

Question 10

Solid fire stream

Answer 10

• Hose stream that stays together as a solid mass

- produced by a smooth bore with a fixed orifice

Question 11

Solid stream nozzles

Answer 11

Design so that the volume of the water flowing through the nozzle is gradually reduce until just before the orifice.

Question 12

What determine the flow and reach of a solid stream

Answer 12

• The nozzle pressure and size of the discharge orifice

Question 13

Fog stream may be produced by

Answer 13

1. Deflection at the periphery
2. By impinging Jets of water
3. combination of both these methods

Question 14

The reach of the fog stream is directly related to its

Answer 14

1. Width
2. Size of the water particles (droplets)
3. Wind
4. Volume of water flowing

Question 15

Nozzles for use on handlines are

Answer 15

1. Fog
2. Solid
3. Broken

Ranging from in size from 3/4 to 3”

Question 16

Master stream

Answer 16

• produce fog or solid streams
• Design for fixed position
• Generally change the direction of water through the device in order to reduce NR
• Water pass through one or more sharp bends that create friction in the appliance.

Question 17

The three basic types of master stream appliances are

Answer 17

1. Fixed:
   - deck gun
2. Portable:
3. Combination:
   • Flow limitation when they are removed from the Apparatus

Question 18

Special Purpose Nozzles

Answer 18

1. Cellar Nozzles:
   - also called distributors
   - lowered through holes
   - attic or void space
2. Piercing Nozzles
   
   • also called penetrating, piercing applicator, puncture nozzle.
   • 3 to 6’ x 1.5” hollow steel rod
   • 125 gpm @ 100 psi
   • Used In aircraft fire fighting, car fire, voids attics, or other areas Inaccessible to standard fire streams.
3. Chimney Nozzles:
   
   • Solid piece of brass steel with small impinging holes
   • 1.5 to 3 gpm @ 100 psi

Question 19

A simple guideline for the customary system of measurement is

Answer 19

NR=Q/3

Q= total flow of water in gpm flowing through the nozzle