单选题Fire extinguishing agents used on Class C fires must be（）.Aable to absorb heatBwater basedCnonconductingDnontoxic
单选题
Fire extinguishing agents used on Class C fires must be（）.
A
able to absorb heat
B
water based
C
nonconducting
D
nontoxic
参考解析
解析：
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相关考题：
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
All portable fire extinguishers must be capable of being ______.A.carried by hand to a fireB.carried or rolled to a fireC.recharged in the fieldD.used on class “B” fire
单选题Halon fire extinguishers are NOT effective when used on which types of fires?（）AFires in electrical equipmentBFlammable oils and greasesCClass A fires in ordinary combustiblesDMaterials containing their own oxygen
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（）.Aacrylic acidBbenzeneColeumDvinyl toluene
单选题A class B fire is most successfully fought by（）.Apreventing oxygen from reaching the burning materialBcooling the burning material below its ignition temperatureCusing the extinguishing agent to make the burning material fire-resistantDusing the extinguishing agent to absorb the heat
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（）.Asix weeksBsix monthsCtwelve monthsDtwo years
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What is an advantage of using foam in fire fighting?（）AIt is effective in controlling fire in flowing oil such as coming from a broken fuel lineBIt absorbs heat from materials that could cause reignitionCMost foams can be used jointly with dry chemical extinguishing agents to attack a fire by two methods of extinguishmentDOnce the surface is blanketed with foam and the fire is extinguished，no further foam is required
单选题For which of the listed classes of fire combinations would carbon dioxide be most suitable as the extinguishing agent （）.AClass A and class BBClass B and class CCClass A and class CDClass C, class D, and class E
单选题Carbon dioxide flooding system is used for extinguishing fires because it reduces the concentration of oxygen in the air to（）.Aflashing pointBcombustion pointCauto-ignition pointDlower explosive limit
单选题Which portable fire extinguisher should be used on a class C fire on board a vessel?（）ACarbon dioxideBWater (stored pressure)CFoamDCarbon tetrachloride
单选题Which fire extinguishing agent can NOT be used on an ethylenediamine?（）AWater foamBDry chemical powderCWater fogDAlcohol foam
单选题The best method of extinguishing a class A fire is to（）.Aremove oxygen from the areaBcool fuel below ignition temperatureCsmother with CO2Dsmother fire with foam
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What is the most important characteristic of the extinguishing agent in fighting a class C fire?（）AWeightBTemperatureCElectrical nonconductivityDCost
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Which of the fire extinguishing agents listed is the safest to use when combating a class C fire?（）ACO2BFoamCWater fogDSoda acid
单选题What is NOT a characteristic of carbon dioxide fire-extinguishing agents?（）AEffective even if ventilation is not shut downBWill not deteriorate in storageCNon-corrosiveDEffective on electrical equipment
单选题The best method of extinguishing a class A fire is to （）.Aremove oxygen from the areaBsmother fire with foamCsmother fire with CO2Dcool fuel below ignition temperature
单选题Which of the listed extinguishing agents is NOT suitable for fighting a liquid paint fire?（）ADry chemicalBFoamCWaterDCarbon dioxide
单选题All portable fire extinguishers must be capable of being（）.Acarried by hand to a fireBcarried or rolled to a fireCrecharged in the fieldDused on class 'B' fires
单选题Which of the following statements is true concerning carbon dioxide when used as a fire extinguishing agent?（）ACarbon dioxide is corrosive when exposed to fireBCarbon dioxide should be applied slowly to a large engine room fireCIts total cooling effect is far greater than waterDIts smothering effect is excellent for class B fires
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Due to the hazards involved with Halon extinguishers on a ship，the size II extinguisher may only be used（）.AoutsideBon class C firesCin an emergencyDon class B fires
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单选题All portable fine extinguishers must be capable of being（）.Acarried by hand to a fireBcarried or rolled to a fireCrecharged in the fieldDused on class B fires