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
Foam is a very effective smothering agent and ______.
A.it provides cooling as a secondary effect
B.works well on extinguishing electrical fires
C.can be used to combat combustible metal fires
D.All of the above
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
Carbon dioxide as a fire fighting agent has which advantage over other agents?A.It causes minimal damageB.It is safer for personnelC.It is cheaperD.It is most effective on a per unit basis
______, 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
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
Firefighting foam is only effective when the foam _____.A.penetrates to the bottom of the fireB.is kept saturated with low-velocity water fogC.mixes with the burning fuel oilD.completely covers the top of the burning liquid
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
Halon extinguishes a fire by ______.A.breaking the chain reactionB.smothering the fireC.cooling the fireD.coating the fuel with a nonflammable surface
How does foam extinguish an oil fire ?______.A.By cooling the oil below the ignition temperatureB.By removing the fuel souce from the fireC.By excluding the oxygen from the fireD.By increasing the weight of the oil
Which of the following components provides for the BEST hardware cooling features？（）A、 Epoxy pasteB、 Chip fanC、 Heat sinkD、 Virtualization
船舶物料商通常给船上供应物料和食品。（）A、The agent usually provides stores and provisions to the ship.B、The shipyard usually provides stores and provisions to the ship.C、The ship chandler usually provides stores and provisions to the ship.D、The captain usually provides stores and provisions to the ship
单选题Which extinguishing agent is effective in combating an isoprene fire?（）ADry chemicalsBCO2CFoamDAll the above
单选题Portable foam type fire extinguishers are most effective on（）.Amattress firesBoil firesCwood firesDAll of the above
单选题What is an advantage of using foam in fire fighting?（）AIt is MOST effective on very hot oil fires where the temperatures of the liquid exceed 100°C (212°F)BMost foams can be used with dry chemicals to attack a fire by two methodsCFoam is effective on combustible metal firesDFoam can be made with seawater or fresh water
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The blocking or absence of fire dampers can cause（）.Athe accumulation of explosive gasesBfaster cooling of the fireCthe fire to spread through the ventilation systemDfixed foam systems to be ineffective
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 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As to the piston cooling, of the following, which statement is not true?（）ABecause the piston is exposed to very high temperature, it must be cooledBThe lower the piston cooling temperature is, the better it isCBoth water and lube oil can be used as coolantDOne of the piston cooling methods is vibration cooling, with better effect
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 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Blocking open or removing fire dampers can cause（）.Afixed foam systems to be ineffectiveBfaster cooling of the fireCthe accumulation of explosive gasesDthe fire to spread through the ventilation system
单选题Which extinguishing agent is most effective on a mattress fire?（）ACO2BFoamCDry ChemicalDWater
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
单选题Firefighting foam is only effective when the foam（）.Apenetrates to the bottom of the fireBis kept saturated with low-velocity water fogCmixes with the burning fuel oilDcompletely covers the top of the burning liquid