Halon extinguishes a fire by ______.A.breaking the chain reactionB.smothering the fireC.cooling the fireD.coating the fuel with a nonflammable surface
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
相关考题：
CO2 extinguishes a fire byA.a blanket of bubbles formed on theB.smotheringC.coolingD.isolating the heat from the fuel
The three basic components of a fire are chain reaction, heat, fuel, and ____.A.carbon monoxideB.oxygenC.carbon dioxideD.any gaseous substance
CO2 extinguishes a fire by __________.A.a blanket of bubbles formed on the surface of the fireB.smotheringC.isolating the heat from the fuelD.cooling
Halogenated hydrocarbon， Halon in short form，is used on board ship as ________ ．A.fire-extinguishing mediumB.a standard fire testC.a non-combustible materialD.a fire main
The fire extinguishing action of CO 2 comes mostly from ______.A.breaking the fire chemical chain reactionB.smotheringC.coolingD.isolating the heat from the fuel
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
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
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
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
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
CO2 and Halon extinguishers are used for electrical fire, as well as （）fire.A、commonB、oilC、electricalD、chemical
单选题Which characteristic is an advantage of Halon as a fire extinguishing medium?（）AElectrically non-conductiveBRelatively inexpensiveCEffective against chemicals containing an oxidizerDAll of the above
单选题A fire of escaping liquefied flammable gas is best extinguished by（）.Acooling the gas below the ignition pointBcutting off the supply of oxygenCstopping the flow of gasDinterrupting the chain reaction
单选题Which is a disadvantage of Halon as a fire extinguishing medium?（）AConducts electricityBDifficult to storeCLarge volume necessary to be effectiveDIneffective in powdered metal fires
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?（）AAny one component can be eliminated to extinguish a fireBAny two components must be eliminated to properly extinguish a fireCAny three components must be eliminated to properly extinguish a fireDAli four components must be eliminated to extinguish any fire
单选题Which characteristic of Halon is a disadvantage when it is used as a fire extinguishing medium?（）ALeaves a residueBCost，relative to other agentsCBreaks down while under prolonged storageDConducts electricity
单选题Halon extinguishes a fire by（）.Abreaking the chain reactionBsmothering the fireCcooling the fireDcoating the fuel with a nonflammable surface
单选题Foam extinguishes a fire by（）.Ashutting off the air supplyBcooling the fuel to below ignition temperatureCdispersing the fuelDremoving the source of ignition
单选题Which of the following statements is true concerning Halon 1301 fire extinguishing equipment?（）AThe agent is considered nontoxic at room temperature in low concentrationsBThe agent is less effective than carbon dioxideCHalon primarily extinguishes the fire by coolingDThe agent cannot be used on electrical fires because it leaves a residue
单选题The fire extinguishing action of CO2 comes mostly from （）.Abreaking the fire chemical chain reactionBsmotheringCcoolingDisolating the heat from the fuel
单选题Except in rare cases，it is impossible to extinguish a shipboard fire by（）.Aremoving the heatBremoving the oxygenCremoving the fuelDinterrupting the chain reaction
单选题Halon extinguishers used on a class C fire should be directed at the（）.Abase of the equipmentBtop of the equipmentCpower sourceDsource of the fire
单选题Halon extinguishes fire primarily by（）.AcoolingBsmotheringCshielding of radiant heatDbreaking the chain reaction
单选题Halon from extinguishers used on a class B fire，should be directed（）.Aat the top of the flamesBat the base of the fire near the edgeCin short quick burstsDtoward the upwind side of the fire