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As an extinguishing agent, foam ______.
A.conducts electricity
B.should be directed at the base of the fire
C.is most efffective on buring gases which are flowing
D.extinguishes by cooling oil fires below ignition temperature
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单选题Production of mechanical foam by a portable in-line foam proportioner（）.A
increases the size of foam bubbles formedB
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benzeneC
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单选题A class B fire is most successfully fought by（）.A
preventing oxygen from reaching the burning materialB
cooling the burning material below its ignition temperatureC
using the extinguishing agent to make the burning material fire-resistantD
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单选题What is an advantage of using foam in fire fighting?（）A
It is effective in controlling fire in flowing oil such as coming from a broken fuel lineB
It absorbs heat from materials that could cause reignitionC
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单选题For which of the listed classes of fire combinations would carbon dioxide be most suitable as the extinguishing agent （）.A
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Class B and class CC
Class A and class CD
Class C, class D, and class E
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单选题Which statement about firefighting foam is TRUE?（）A
Foam conducts electricityB
To be most effective，foam should be directed at the base of the fireC
Foam is most effective on burning liquids which are flowingD
Foam can ONLY be used to extinguish class A fires
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sweep flames away with water sprayB
shut off the leakC
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call t e local fire department
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单选题Water is a very effective fire extinguishing agent because it（）A
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has the greatest cooling abilityC
will leave no harmful residueD
completely removes combustible vapors from the air
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单选题Which extinguishing agent is the best for use on electrical fires?（）A
FoamB
CO2C
Dry chemicalD
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Water foamB
Dry chemical powderC
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单选题As an extinguishing agent，foam（）.A
conducts electricityB
should be directed at the base of the fireC
is most effective on burning gases which are flowingD
extinguishes by cooling oil fires below ignition temperature
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单选题Which extinguishing agent will cool down a heated bulkhead in the least amount of time?（）A
Water streamB
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单选题Which extinguishing agent is NOT recommended in the Chemical Data Guide for use on a cyclohexane fire?（）A
FoamB
Carbon dioxideC
Dry chemicalD
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单选题The best method of extinguishing a class A fire is to（）.A
remove oxygen from the areaB
cool fuel below ignition temperatureC
smother with CO2D
smother fire with foam
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单选题What is the most important characteristic of the extinguishing agent in fighting a class C fire?（）A
WeightB
TemperatureC
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Cost
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单选题Which of the following statements is true concerning Halon 1301 fire extinguishing equipment?（）A
The agent is considered nontoxic at room temperature in low concentrationsB
The agent is less effective than carbon dioxideC
Halon primarily extinguishes the fire by coolingD
The agent cannot be used on electrical fires because it leaves a residue
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单选题An extinguishing agent which effectively cools，dilutes combustible vapors，removes oxygen，and provides a heat and smoke screen is（）.A
carbon dioxideB
Halon 1301C
dry chemicalD
water fog
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单选题0ne of the limitations of foam as an extinguishing agent is that foam（）.A
cannot be made with salt waterB
is heavierthan oil and sinks below its surfaceC
is corrosive and to fire fightersD
conducts electricity
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单选题Generally，the first action in extinguishing an LFG fire caused by escaping gas is to（）.A
sweep flames away with water sprayB
shut off the leakC
use a chemical foam fire extinguisherD
call the local fire department
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单选题Where foam extinguishing systems are provided on a ship，each machinery flat in the protected space must have a(n)（）.A
coamingB
alarmC
drainD
fire sensor
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单选题Foam is a very effective smothering agent and（）.A
it provides cooling as a secondary effectB
works well on extinguishing electrical firesC
can be used to combat combustible metal firesD
All of the above
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