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Halon extinguishes a fire by ______.
A.breaking the chain reaction
B.smothering the fire
C.cooling the fire
D.coating the fuel with a nonflammable surface
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更多 “ Halon extinguishes a fire by ______.A.breaking the chain reactionB.smothering the fireC.cooling the fireD.coating the fuel with a nonflammable surface ” 相关考题
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Except in rare cases, it is impossible to extinguish a shipboard fire by ______.A.removing the heatB.removing the oxygenC.removing the fuelD.interrupting the chain reaction
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Foam extinguishes a fire by ______.A.shutting off the air supplyB.cooling the fuel to below ignition temperatureC.dispersing the fuelD.removing the source of ignition
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Which of the following is a class A fire?下列哪一项是A类火灾（）A、Halon 卤化烃(二氟二氯甲烷)B、electrical 电气类C、liquid 液体类
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In anchor orders, “Up and down” means “（）”.A、The chain is not uprightB、The chain is uprightC、The chain is slackD、The chain is not slack
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CO2 and Halon extinguishers are used for electrical fire, as well as （）fire.A、commonB、oilC、electricalD、chemical
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单选题Which characteristic is an advantage of Halon as a fire extinguishing medium?（）A
Electrically non-conductiveB
Relatively inexpensiveC
Effective against chemicals containing an oxidizerD
All of the above
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单选题A fire of escaping liquefied flammable gas is best extinguished by（）.A
cooling the gas below the ignition pointB
cutting off the supply of oxygenC
stopping the flow of gasD
interrupting the chain reaction
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单选题Which is a disadvantage of Halon as a fire extinguishing medium?（）A
Conducts electricityB
Difficult to storeC
Large volume necessary to be effectiveD
Ineffective in powdered metal fires
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单选题The four basic components of a fire are fuel, heat, oxygen and a chain reactionWhich of the following statements best describes what must be eliminated to extinguish a fire?（）A
Any one component can be eliminated to extinguish a fireB
Any two components must be eliminated to properly extinguish a fireC
Any three components must be eliminated to properly extinguish a fireD
Ali four components must be eliminated to extinguish any fire
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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Halon extinguishes a fire by（）.A
breaking the chain reactionB
smothering the fireC
cooling the fireD
coating the fuel with a nonflammable surface
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单选题Foam extinguishes a fire by（）.A
shutting off the air supplyB
cooling the fuel to below ignition temperatureC
dispersing the fuelD
removing the source of ignition
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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The fire extinguishing action of CO2 comes mostly from （）.A
breaking the fire chemical chain reactionB
smotheringC
coolingD
isolating the heat from the fuel
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单选题Except in rare cases，it is impossible to extinguish a shipboard fire by（）.A
removing the heatB
removing the oxygenC
removing the fuelD
interrupting the chain reaction
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单选题Foam extinguishes a fire mainly by（）.A
coolingB
chemical actionC
smotheringD
inerting the air
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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Halon extinguishes fire primarily by（）.A
coolingB
smotheringC
shielding of radiant heatD
breaking the chain reaction
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单选题Halon from extinguishers used on a class B fire，should be directed（）.A
at the top of the flamesB
at the base of the fire near the edgeC
in short quick burstsD
toward the upwind side of the fire
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