Chapter 6 - Hose Nozzles and Flow Rates Flashcards
An automatic fog nozzle is designed to change patterns while:
maintaining the same nozzle pressure.
page 198
Impinging stream nozzles most often provide a _________ pattern
wide-angle fog
page 196
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:
piercing nozzle.
page 201
The nozzle pressure and size of the _________ determine the flow and reach of a solid stream
discharge orifice
page 194
A high pressure fog nozzle is designed to:
provide a relatively low volume of water delivery.
page 199
A constant flow fog nozzle is designed to flow ___________________ water on all stream patterns at a specific nozzle discharge pressure.
a specific volume of
page 197
Which is the customary formula for determining nozzle reaction for solid stream nozzles?
NR = 1.57 × d2 × NP
page 203
A solid stream nozzle is designed so that the volume of water flowing through the nozzle is:
gradually reduced until just before the orifice.
page 194
Which of the following is the customary formula for discharge rate?
GPM = 29.7 × d2 × √NP
page 195
What is a constant in the metric formula for discharge rate?
0.067
page 195
What directly affects the reach of the fog stream?
Volume of water flowing
page 197
A driver/operator may need to determine the amount of water discharged from a solid stream to _______________ when a nozzle is attached to a hydrant
Test the water supply
page 194-195
What is the customary formula for nozzle reaction for a fog stream nozzle?
NR = 0.0505 x Q x ?NP
page 204
High pressure fog nozzles are best suited for:
wildland fires.
page 199
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?
NR = Q/3
page 203
Each type of monitor has the ability to change the ________________ while water is being discharged
stream direction or angle
page 200
Which manner of producing fog streams occurs by deflecting water around an inside circular stem in the nozzle?
Periphery-deflected streams
page 196
Which nozzle consists of a solid piece of brass or steel with many small impinging holes that produce a very fine mist?
Chimney nozzle
page 201
Master stream appliances should be operated at a maximum of:
150 psi (1050 kPa).
page 194
Which nozzle may also be referred to as a distributor?
Select one:
Cellar nozzle
page 200
In the metric formula for nozzle reaction for a fog stream nozzle, what does Q stand for?
Total flow through the nozzle in liters per minute (L/min)
page 204
Solid stream nozzles on handlines should generally be operated at a maximum of:
50 psi (350 kPa) nozzle pressure.
page 194
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?
Cellar nozzle
page 201
