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单选题
Any extinguishing agent used on a Class “C” fire must have which important property? （）
A
Cooling ability
B
Leaves no residue
C
Penetrating power
D
Nonconductivity
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单选题On a bulk chemical carrier，water should NOT be used as an extinguishing agent to fight a fire if the water may come into contact with the chemical called（）.A
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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Each hand portable，semi-portable and fixed fire extinguishing unit on a ship must be tested and inspected at least once every（）.A
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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
Class A and class BB
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 portable fire extinguisher should be used on a class C fire on board a vessel?（）A
Carbon dioxideB
Water (stored pressure)C
FoamD
Carbon tetrachloride
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单选题Water is a very effective fire extinguishing agent because it（）A
will remove all the toxic fumes from the airB
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 best for use on a magnesium fire?（）A
WaterB
SandC
CO2D
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单选题Which fire extinguishing agent can NOT be used on an ethylenediamine?（）A
Water foamB
Dry chemical powderC
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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
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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Which characteristic of Halon is a disadvantage when it is used as a fire extinguishing medium?（）A
Leaves a residueB
Cost，relative to other agentsC
Breaks down while under prolonged storageD
Conducts electricity
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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
Electrical nonconductivityD
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Which of the fire extinguishing agents listed is the safest to use when combating a class C fire?（）A
CO2B
FoamC
Water fogD
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单选题The best method of extinguishing a class A fire is to （）.A
remove oxygen from the areaB
smother fire with foamC
smother fire with CO2D
cool fuel below ignition temperature
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单选题Which of the following statements is true concerning carbon dioxide when used as a fire extinguishing agent?（）A
Carbon dioxide is corrosive when exposed to fireB
Carbon dioxide should be applied slowly to a large engine room fireC
Its total cooling effect is far greater than waterD
Its smothering effect is excellent for class B fires
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单选题Fire extinguishing agents used on Class C fires must be（）.A
able to absorb heatB
water basedC
nonconductingD
nontoxic
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单选题Halon extinguishers used on a class C fire should be directed at the（）.A
base of the equipmentB
top of the equipmentC
power sourceD
source of the fire
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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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单选题The preferred agent used in fighting a helicopter crash fire is（）.A
CO2B
dry chemicalC
waterD
foam
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