Chapter 16 Fire Streams

What terminology refers to the energy required to change a liquid into a vapor?

latent heat of vaporization

Poor quality foam may result from:

mixing different types of foam concentrate in the same tank

Which type of nozzle can be used to effectively control fires in concealed spaces?

piercing

Which type of nozzle control valve seats a movable cylinder against a shaped cone in order to terminate water flow?

slide valve

When operating a handline, why should a firefighter open the control valve slowly?

to better control nozzle reaction

True or False: alcohol-resistant foams are specially developed for polar solvents and ethanol-based fuels

true

True or false: foam concentrates pose minimal health risks to firefighters

true

True or false: for maximum effectiveness, foam concentrates must be proportioned at the specific percentage for which they were designed

true

Which of following statements about foam concentrates is MOST accurate?

Class B foams are effective on hydrocarbon fuels and polar solvents

Which of the following statements about foam proportioning is MOST accurate?

Eduction uses pressure energy in the stream of water to induct foam concentrate into the fire stream

The primary way water extinguishes fire is by excluding oxygen from the fuel (smothering) (T/F)

False

Which of the following statements about fire fighting foam is MOST accurate?

Foam works by forming a blanket of foam on the surface of burning fuels

Which of the following statements about fog streams is MOST accurate?

Fog stream patterns may be used to cool the hot fire gas layer

Which of the following fire streams is supplied by 1 1/2 to 3-inch hose, and discharges from 40 to 350 gpm?

Handline stream

Which of the following statements about foam hazards is MOST accurate?

Manufacturers' safety data sheets provide environmental impact information for specific foam concentrates

Which of the following stream patterns has the ability to reach areas other streams might not reach?

Solid stream

What can be done to help overcome friction loss?

adding additional parallel hoselines

Which technique for applying Class B foam is used primarily on fires contained in diked pools around storage tanks and fires involving spills around damaged or overturned transport vehicles?

bank-down method

Which type of nozzle can be adjusted, resulting in different patterns?

fog nozzle

To prevent water hammer, valves, nozzles, and hydrants should be closed slowly (T/F)

True

Which of the following statements about fire streams is MOST accurate?

Water broken into small droplets absorbs heat more rapidly

Which nozzles pump foam solution through the nozzle in a fine spray that mixes with air to form foam?

Water-aspirating nozzles