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
