-
The primary way water extinguishes fire is by -
cooling
-
__ is defined as that part of the total pressure that is lost while forcing water through a pipe, fitting, fire hose, and adapters.
Friction loss
-
Parallel or siamese hoselines are used in order to -
Increase flow and reduce friction.
-
In fire fighting elevation refers to -
The position of the nozzle in relation to the pumping apparatus.
-
__ refers to the gain or loss of pressure in a hoseline due to a change in elevation.
Elevation pressure.
-
When water flowed through a hoseline or pipe is suddenly stopped, the resulting surge of pressure is referred to as -
water hammer
-
The best way to avoid causing a water hammer is to -
Close nozzles and valves slowly.
-
A fire stream that discharges less than 40 gallons per minute would be classified as a -
A) Low volume stream.
B) Handline stream.
C) Hoseline stream.
D) Master stream.
Answer: A
-
A fire stream that discharges 40 to 350 gallons per minute would be considered a -
A) Low volume stream.
B) Handline stream.
C) Hoseline stream.
D) Master stream.
Answer: B
-
A fire stream that discharges more than 350 gpm would be classified as a -
master stream
-
The fire stream produced from a fixed, smoothbore nozzle is known as a -
Solid stream.
-
Fire streams that have been formed into coarse divided drops are known as -
broken streams
-
Which fire stream is less likely to disturb the thermal layering in an interior structure fire attack?
solid stream
-
If a solid stream is used on a handline it should be operated at ____ psi.
50
-
A solid master stream device should operate at a pressure of -
80 psi
-
The point at which a fire stream begins to lose its forward velocity is known as -
the point of breakover.
-
Which would not be considered a Polar Solvent?
A) Acetone.
B) Benzene.
C) Lacquer thinner.
D) Acids.
Answer: B
-
Which of the following would not be considered a Hydrocarbon fuel:
A) Alcohols.
B) Crude oil.
C) Naphtha.
D) Gasoline.
Answer: A
-
Foam has been shown to be an effective means for extinguishing fires involving -
Flammable liquids
-
What may be the consequence, if ventilation is not provided ahead of hose teams involved in a direct or combination fire attack?
There is a high possibility that steam and even fire will roll back over and around the hose team.
-
Which type of fire fighting foam is the most commonly used at a rate of 20:1 to 200:1?
Medium expansion foam.
-
Low expansion foam has an air/solution ratio up to -
20:1
-
Class B foams are designed to extinguish -
all class B fires
-
High expansion foams have an expansion ratio between -
200 : 1 to 1,000 : 1.
-
Class A foams effectively work by -
Reducing the surface tension of the water in the foam solution, thereby providing for increased water penetration, and increased effectiveness.
-
Most foam concentrates are intended to be mixed with __ water.
A) 75% - 80%.
B) 80% - 90%.
C) 90% - 94%.
D) 94% - 99.9%.
Answer: D
-
At what concentration would you use a Class B foam when dealing with hydrocarbon fuels?
3%
-
At what concentration would you use a multipurpose Class B foam when dealing with a polar solvent fuel?
6%.
-
When using an in-line eductor, what is the maximum height the eductor can be placed above the foam concentrate liquid level?
6 feet
-
The most effective nozzle for generating low expansion foam is the -
Air-aspirating foam nozzle.
-
Which nozzle cannot be used with protein or fluoroprotein foams?
Fog nozzles.
-
Which would NOT be considered a technique for applying foam to a liquid fuel fire or spill?
A) Build-Up method.
B) Roll-On method.
C) Bank-down method.
D) Rain-down method.
Answer: A
-
Which foam application technique would you be using if you directed the foam stream on the ground near the front edge of a burning liquid pool, and allowed it to roll across the surface of the fuel.
roll on method
-
Combination nozzles are designed to operate at different pressures. The designed operating pressure for most combination nozzles is -
75 psi
-
IFSTA defines a handline nozzle as any nozzle that __ can safely handle.
3 firefighters
-
IFSTA defines a handline nozzle that flows less than -
350 gpm
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