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
CO2 extinguishes a fire by __________.
A.a blanket of bubbles formed on the surface of the fire
B.smothering
C.isolating the heat from the fuel
D.cooling
相关考题：
According to the passage, which is true about the ocean?A. The waters of the ocean came from rain water.B. The ocean was formed from the, lighter rock materials.C. The vast single ocean formed about 200 million years ago.D. The ocean covered the whole surface of the earth at very beginning.
The BEST method of applying foam to a fire is to ______.A.spray directly on the base of the fireB.flow the foam down a nearby vertical surfaceC.sweep the fire with the foamD.spray directly on the surface of the fire
The most effective way to apply a foam stream if the fire is on deck or is a runing fire, is to direct the stream ______.A.onto the surface of the burning liquidB.ahead of the burning liquid and bounce it on the fireC.at the base of the burning liquid in a sweeping motionD.just above the surface of the burning liquid
CO2 extinguishes a fire byA.a blanket of bubbles formed on theB.smotheringC.coolingD.isolating the heat from the fuel
Sludge may be formed in the oil in the crankcase of a reciprocating air conditioning compressor as a result of ______.A.refrigerant bubbles in the lube oilB.refrigerant reducing the lube oil viscosityC.oxidation(氧化) of the lube oil from overheatingD.reducing the floc or cloud point of the oil
An ABC dry chemical fire extinguisher would be LEAST effective against a fire in ______.A.a mattressB.spilled liquids such as oil or paintC.high voltage electrical gearD.a trash can
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
CO2 and Halon extinguishers are used for electrical fire, as well as （）fire.A、commonB、oilC、electricalD、chemical
单选题What is meant by the term overhaul in firefighting?（）ASlow down the spread of fire by cooling adjacent structuresBCover the fire with foamCSmother the fire with a blanket or similar objectDBreak up solid objects to ensure that any deep seated fires are extinguished
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If a CO2 fire extinguisher is not readily available, which of the listed fire extinguishers would be best suited to combat a small electrical fire in a switchboard?（）ADry chemicalBHalonCLow velocity fogDSteam
单选题The FIRST course of action in fighting a fire in a cargo or fuel oil tank is to （）.Asecure all openings to the tankBdischarge an initial charge of CO2 with a hand portable extinguisherCdirect a fire hose into the tank and energize the fire mainDspray the tank boundaries with a fire hose to promote cooling
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When an oil fire has been extinguished, the surface of the oil should be kept covered with foam to prevent （）.Aair from contacting the oil vaporsBpermitting re-ignition boiling of the heated oilCspontaneous combustion below the oil surfaceDtoxic fumes from escaping to the surface
单选题The usual method of effectively applying foam on a fire is by （）.Aspraying directly on the base of the fireBflowing the foam down a vertical surfaceCsweeping the fire before you with the foamDspraying directly on the surface of the fire
单选题The BEST method of applying foam to a fire is to（）.Aspray directly on the base of the fireBflow the foam down a nearby vertical surfaceCsweep the fire with the foamDspray directly on the surface of the fire
单选题When fighting an electrical fire, you should first （）.Astop ventilation to the areaBstop the vesselCsecure electricity to the circuitDapply CO2 to the fire
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Sludge may be formed in the oil in the crankcase of a reciprocating air conditioning compressor as a result of （）Arefrigerant bubbles in the lube oilBrefrigerant reducing the lube oil viscosityCoxidation of the lube oil from overheatingDreducing the floc or cloud point of the oil
单选题Halon extinguishes fire primarily by（）.AcoolingBsmotheringCshielding of radiant heatDbreaking the chain reaction
单选题CO2 extinguishes a fire by （）.Aa blanket of bubbles formed on the surface of the fireBsmotheringCcoolingDisolating the heat from the fuel
单选题Your vessel is equipped with a fixed CO2 system and a fire main system. In the event of an electrical fire in the engine room what is the correct procedure for fighting the fire?（）AUse the CO2 system and evacuate the engine roomBUse the fire main system and evacuate the engine roomCEvacuate the engine room and use the CO2 systemDEvacuate the engine room and use the fire main system