Chapter 16
Water expands approximately ________ its orginal volume as it is vaporized into steam
1,700 times
The designated operating pressure for most fog nozzles is:
100 psi
Under ideal conditions, the greatest horizontal reach for a fire stream is attained at:
45 degrees from the horizontal plane
Smooth bore nozzles will require additional personnel for safe handling at nozzle pressures greater than:
65 PSi
Which statement about fire streams is most accurate?
A stream broken into small droplets absorbs heat more efficiently
What is the primary way water extinguishes fire?
Absorbing heat
A decrease in water pressure at the nozzle might be caused by:
Adding bends to the hose lay
Which of the following statements about fire streams is most accurate?
An effective fire stream must have sufficient reach to put the water where it is needed
Which of the following types of nozzle control valves provides effective control with minimum effort?
Ball valve
Which of the following types of fog nozzles is an adjustable pattern nozzle in which the rated discharge is delivered at a designated nozzle pressure and nozzle setting?
Basic
Which statement about broken streams is most accurate?
Broken streams have greater reach and penetration than fog streams
Which of the following is the best way to prevent water hammer?
Close control valves and nozzles slowly
Which of the following types of fog nozzles is an adjustable-pattern nozzle that discharges a constant dishcharge rate throughout the range of patterns at a designed nozzle pressure?
Constant gallonage
Which of the following types of fog nozzles is an adjustable-pattern nozzle which automatically varies the rate of flow to maintain constant nozzle pressure?
Constant pressure
Which of the following types of fog nozzles is a constant discharge rate fog nozzle that allows manual adjustment of the orifice to set a predeternmined discharge rate while the nozzle is flowing?
Constant/select gallonage
Which of the following statements best describes a fog stream?
Fine spray composed of tiny water droplets
Which of the following statements about fire streams is most accurate?
Fire streams are affected by velocity of the water, wind velocity, and nozzle design.
A straight stream is created by which of the following nozzles?
Fog nozzle
Which of the following fire stream patterns may be used for crew protection?
Fog stream
Which size stream discharges from 40 to 350 gpm and is supplied by 1 1/2 to 3 inch hose?
Handline stream
Which of the following statements about water pressure is most accurate?
If the nozzle is below the fire pump, nozzle pressure is increased
Which of the following statements about operating nozzles on handlines is most accurate?
Increasing discharge pressure and flow rate increases nozzle reaction
which size stream discharges less than 40gpm
LOw-volume stream
The amount of heat required to convert a unit mass of a liquid into a vapor without a temperature change is:
Latent heat of vaporization
Which of the following statements about maintaining nozzles is most accurate?
Maintenance, care and clearning should be performed according to manufacturer's instructions
Which size stream discharges more than 350 gpm and is supplied by one or more 2 1/2 or 3 inch hoselines?
Master stream
Apparatus-mounted appliances are used to create:
Master streams
Which NFPA standard established fire nozzle categories?
NFPA 1963
Which of the following nozzles is used to apply water in confined spaces that attack hoselines cannot reach?
Piercing nozle
Which of the following nozzle types is driven into place with a mallet, sledge hammer, or flatheda axe?
Piercing nozzle
Which of the following ebst describes a use of a fire stream?
Reducing temperature so fire personnel can advance handlines
Friction loss may be overcome by:
Removing bends from the hoseline
Which of the following statements about rotary control valves is mosta accurate?
Rotary control valves control both the flow of water and the discharge pattern of the fire stream
Which of the following nozzle control valves ues a moveable cylinder against a shaped cone to turn off the flow of water?
Slide valve
Which type of nozzle produces a solid stream?
Smooth bore nozzle
Which of the following statementsa bout smooth bore nozzles is most accurate?
Smooth bore nozzles are less prone to clogging with debris
Which of the followign fire stream patterns has the ability to reach areas other streams might not reach?
Solid stream
Which of the following fire stream patterns is most likely to conduct electricity?
Solid strem
Which of the following will cause the upper layer of hot smoke and fire gases to contract toward the ceiling?
Steam formed in the upper layer of hot fire gases
Which statement about steam is most accurate?
Steam produced on contact with hot surfacces causes the upper layer of hot smoke and fire gases to expand downward
Which of the following statements about inspecting nozzles is most accurate?
Technical maintenance should be performd by qualifed technicians
The specific heat of a substance is:
The aount of energy required to increase the temperature of the substance one degree
Which of the following statements about friction is most accurate?
The smaller the hose diameter, the higher the friction loss
Which of the following characteristics make water valuable for fire extinguishment?
Water absorbs large amounts of energy when changing to steam
Which of the following statements about water hammer is most accurate?
Water hammer is caused by closing a nozzle quickly and suddenly
Gravity may affect a solid fire stream by:
causing the stream to seperate and lose its compact shape
