Chapter 6 Flashcards
This is a reason that driver/operators may need to determine the amount of water discharged from a solid stream nozzle?
Test the water supply when a nozzle is attached to a hydrant
Which of the following is a characteristic of master stream nozzles?
Offer ability to operate at a greater distance from the fire
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.
both up and down and side to side.
Which of the following directly affects the reach of the fog stream?
Volume of water flowing
High pressure fog nozzles are BEST suited for:
wildland fires
What happens to an automatic nozzle when the pump discharge pressure rises above the constant operating pressure?
Automatic nozzle maintains its constant operating pressure, within the limitation of its design
A solid stream nozzle is designed so that the volume of water flowing through the nozzle:
is gradually reduced until just before the orifice.
Why are most fog nozzles designed to operate at or below 100 psi (700 kPa) nozzle pressure?
Above this pressure, handlines become unwieldy for firefighters attempting fire suppression operations.
Which of the following 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
Master stream appliances should be operated at a maximum of:
80 psi
Which of the following is the customary formula for determining nozzle reaction for solid stream nozzles?
NR = 1.57 × d&squared; × NP
Which manner of producing fog streams occurs by deflecting water around an inside circular stem in the nozzle?
Periphery-deflected streams
Which of the following BEST determines the flow and reach of a solid stream?
Nozzle pressure and size of the discharge orifice
Which of the following is a type of variable flow nozzle with the ability to change patterns while maintaining the same nozzle pressure?
Automatic fog nozzle
Which nozzle is commonly used in aircraft fire fighting or to apply water to voids, attics, or other areas inaccessible to standard fire streams?
Piercing nozzle
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
Nozzle reaction occurs as water is discharged from a nozzle at a given pressure and:
a counterforce pushes back against firefighters operating the hoseline.
A solid stream nozzle produces a fire stream that has a:
tight stream and little spray or shower effect
Which of the following statements about master stream appliances is MOST accurate?
Each type of monitor has ability to change the stream direction or angle while water is being discharged.
Master stream nozzles would MOST likely be used at an incident where:
handlines would be ineffective.
Which pattern is MOST often provided by impinging stream nozzles?
Wide-angle fog pattern
Generally, the maximum flow for a handline is 350 gpm (1 400 L/min) because greater flows will:
produce a nozzle reaction that is difficult or dangerous for firefighters to handle.
Which nozzle consists of a solid piece of brass or steel with many small impinging holes that produce a very fine mist?
Chimney nozzle
Which of the following is designed to allow the firefighter operating the handline to select a flow rate to suit the fire and operating conditions?
Selectable gallonage nozzle
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)
Which of the following is the customary formula for nozzle reaction for a fog stream nozzle?
NR = 0.0505 × Q × √NP
Which of the following is designed to flow a specific volume of water on all stream patterns at a specific nozzle discharge pressure?
Constant flow fog nozzle
Which nozzle may also be referred to as a distributor?
Cellar nozzle
Which statement about high pressure fog nozzles is MOST accurate?
They have a relatively low volume of water delivery
