Hose Nozzles And Flow Rates

Question 1

What are the main types of fire streams available?

Answer 1

Solid stream
Fog stream
Broken stream

Question 2

When would special purpose nozzles be used?

Answer 2

To operate effectively in unusual locations, or on specific fuels.

Question 3

Why is it important to take into account nozzles pressure and reaction?

Answer 3

Excessive nozzles pressure may produce a reaction that may seriously injure firefighters and hamper fire suppression efforts.

Question 4

Which type of nozzle produces a tight stream with little spray or shower effect?

Answer 4

Solid stream nozzle

Question 5

The flow and reach of a solid stream nozzle is determined by the size of the discharge orifice and the…

Answer 5

nozzle pressure

Question 6

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

Answer 6

350 kpa

Question 7

At what maximum pressure should solid stream master stream appliances be operated?

Answer 7

550 kpa

Question 8

Periphery deflected streams are produced by deflecting water around…

Answer 8

an inside circular stem in the nozzle

Question 9

What type of fog stream breaks water into fine, evenly divided particles by driving several jets of water together at an angle?

Answer 9

Impinging stream
(also a fog nozzle)

Question 10

Impinging stream nozzles most often provide a…

Answer 10

wide angle fog pattern

Question 11

The reach of a fog stream is directly related to…

Answer 11

the wind

Question 12

The type of nozzle that is designed to flow a specific volume of water on all stream patterns at a specific nozzle discharge pressure is called…

Answer 12

Constant flow fog nozzle

Question 13

The type of nozzle that allows the firefighter operating the handline to select the flow rate to suit fire and operating conditions is called the…

Answer 13

selectable gallonage nozzle

Question 14

When properly supplied, both a selectable gallonage nozzle and a _______ will discharge predetermined gallonage.

Answer 14

constant flow nozzle

Question 15

A type of variable nozzle with the ability to change patterns while maintaining the same nozzle pressure is called the…

Answer 15

automatic fog nozzle

Question 16

If the gallonage supplied to an automatic fog nozzle changes, the automatic nozzle….

Answer 16

adjusts to maintain virtually the same pressure

Question 17

Which type of nozzle produces a stream with significant forward velocity and relatively low volume of water delivery?

Answer 17

High pressure fog nozzles

Question 18

Which of the following would high pressure fog nozzles be BEST suited for?
Vehicle fire
Wildland fire
Multiple occupancy fire
Industrial occupancy fire

Answer 18

Wildland fires

Question 19

Why is 1400 lpm generally the maximum flow for a handline?

Answer 19

Greater flows will produce a nozzle reaction that is difficult or dangerous for firefighters to handle.

Question 20

What can be said about master stream nozzles…

Answer 20

They generate considerable nozzle reaction due to their high flow rate.

Question 21

An incident where master streams are most likely to be used is…

Answer 21

when personnel are limited

Question 22

What is an advantage of master streams?

Answer 22

They offer the ability to operate at a greater distance from the fire

Question 23

Each type of master stream monitor has the ability to change the stream direction or angle…

Answer 23

while water is being discharged

Question 24

Which type of master stream appliance has flow limitations when removed from the apparatus and placed on the ground?

Answer 24

Combination monitor

Question 25

Elevated master streams that have pre-piped waterways generally feature a master stream that may be controlled remotely from the apparatus turntable and is generally able to…

Answer 25

move both up and down and side to side

Question 26

Special purpose nozzles that may be referred to as distributors are called…

Answer 26

cellar nozzles

Question 27

Special purpose nozzles that are often lowered through holes or other openings to the cellar of an occupancy are called…

Answer 27

cellar nozzles

Question 28

Special purpose nozzles that are commonly used in aircraft firefighting, car fires, or to apply water to voids, attics, or other areas inaccessible to standard fire streams are called…

Answer 28

piercing nozzles

Question 29

Special purpose nozzles that have a hardened steel point capable go being driven through a variety of material such as concrete blocks are called…

Answer 29

piercing nozzles

Question 30

Special purpose nozzles that consist of a solid piece of brass or steel with many small impinging holes that produce a very fine mist are called…

Answer 30

chimney nozzles