As an extinguishing agent, foam ______.A.conducts electricityB.should be directed at the base of the fireC.is most efffective on buring gases which are flowingD.extinguishes by cooling oil fires below ignition temperature
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
相关考题：
One of the limitations of foam as an extinguishing agent is that foam ______.A.cannot be made with salt waterB.is heavier than oil and sinks below its surfaceC.is corrosive and a hazard to fire fightersD.conducts electricity
______, as the chemical extinguisher agent, should be used for an electric fire.A.dry chemical or foamB.foam or soda acidC.carbon dioxide or foamD.carbon dioxide or dry chemical
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
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
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
单选题Production of mechanical foam by a portable in-line foam proportioner（）.Aincreases the size of foam bubbles formedBincreases the rate of foam productionCimproves the extinguishing properties of foamDgives the nozzleman more freedom of movement，since it can be placed anywhere in the hose line
单选题Which extinguishing agent is recommended in the Chemical Data Guide for use on a carbon disulfide fire?（）AAlcohol foamBDry chemicalCChemical foamDWater fog
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Which statement about firefighting foam is TRUE?（）AFoam conducts electricityBTo be most effective，foam should be directed at the base of the fireCFoam is most effective on burning liquids which are flowingDFoam can ONLY be used to extinguish class A fires
单选题Generally, the first action in extinguishing an LFG fire caused by escaping gas is to（）.Asweep flames away with water sprayBshut off the leakCuse a chemical foam fire extinguisherDcall t e local fire department
单选题Water is a very effective fire extinguishing agent because it（）Awill remove all the toxic fumes from the airBhas the greatest cooling abilityCwill leave no harmful residueDcompletely removes combustible vapors from the air
单选题Which extinguishing agent is the best for use on electrical fires?（）AFoamBCO2CDry chemicalDWater fog
单选题Which fire extinguishing agent can NOT be used on an ethylenediamine?（）AWater foamBDry chemical powderCWater fogDAlcohol foam
单选题As an extinguishing agent，foam（）.Aconducts electricityBshould be directed at the base of the fireCis most effective on burning gases which are flowingDextinguishes by cooling oil fires below ignition temperature
单选题Which extinguishing agent will cool down a heated bulkhead in the least amount of time?（）AWater streamBWater fog or aprayCSteamDDry chemical
单选题Which extinguishing agent is NOT recommended in the Chemical Data Guide for use on a cyclohexane fire?（）AFoamBCarbon dioxideCDry chemicalDWater fog
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An extinguishing agent which effectively cools，dilutes combustible vapors，removes oxygen，and provides a heat and smoke screen is（）.Acarbon dioxideBHalon 1301Cdry chemicalDwater fog
单选题0ne of the limitations of foam as an extinguishing agent is that foam（）.Acannot be made with salt waterBis heavierthan oil and sinks below its surfaceCis corrosive and to fire fightersDconducts electricity
单选题Generally，the first action in extinguishing an LFG fire caused by escaping gas is to（）.Asweep flames away with water sprayBshut off the leakCuse a chemical foam fire extinguisherDcall the local fire department
单选题Where foam extinguishing systems are provided on a ship，each machinery flat in the protected space must have a(n)（）.AcoamingBalarmCdrainDfire sensor
单选题Foam is a very effective smothering agent and（）.Ait provides cooling as a secondary effectBworks well on extinguishing electrical firesCcan be used to combat combustible metal firesDAll of the above