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 extinguishers used on a class C fire should be directed at the（）.
A
base of the equipment
B
top of the equipment
C
power source
D
source of the fire
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When will the fire department come to conduct a fire prevention inspection in our company?A. Next month. I’ve checked hydrants and fire-extinguishers on each floorB.Next day. The manager will check hydrants and other equipment in the building.C.Next week. But hydrants and fire extinguishers on each floor has already been checkedD.The day before yesterday. I had already checked hydrants and fire extinguishers on each floor.
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
To determine the number of portable fire extinguishers required on an inspected vessel，you should check the ______.A.hot work permitB.Certificate of InspectionC.Safety of Life at Sea CertificateD.station bill
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
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
CO2 and Halon extinguishers are used for electrical fire, as well as （）fire.A、commonB、oilC、electricalD、chemical
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The principal personnel hazard unique to Halon extinguishers is（）.Adisplacement of oxygenBskin irritationCinhaling toxic vaporsDeye irritation
单选题The straight stream capability of an all-purpose nozzle is used in fighting a class A fire to（）.Ashield fire fighters from radiant heatBbreak up burning materialCget the most water possible on the fireDdrive heat and smoke ahead of the fire fighters
单选题Burning diesel oil should be treated as which class of fire?（）AClass ABClass BCClass CDClass D
单选题A high-velocity fog stream can be used in fire fighting situations to drive heat and smoke ahead of the fire fighters in a passageway. This technique should only be used when（）.Ausing a 2-1/2 inch hoseBthere is an outlet for the smoke and heatCthe fire is totally contained by the ship's structureDat least two fog streams can be used
单选题Before attempting to put out a class “C” fire involving an electric-driven centrifugal pump, you should FIRST （）.Ainsulate your shoesBground the fire hoseCsecure its power supplyDstart the fire pump
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 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Fire extinguishers used on ship’s are numbered by size I through V，with I being（）.Aused for electrical fires onlyBthe smallestCthe most accessibleDthe most effective
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When choosing extinguishers to fight a Class “B” fire do NOT use（）.Acarbon dioxideBdry chemicalCfoam (stored-pressure type)Dwater (cartridge-operated)
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
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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
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
单选题A carbon dioxide fire extinguisher has been partially discharged, and should be immediately （）.Atagged and restowed properly in its rackBweighed and the charge loss recordedCgiven to the chief engineer for rechargingDtagged empty and stowed separately from charged extinguishers
单选题To determine the number of portable fire extinguishers required on an inspected vessel，you should check the（）.Ahot work permitBCertificate of InspectionCSafety of Life at Sea CertificateDMuster List
单选题Portable CO2 fire extinguishers should NOT be used to inert a space containing flammable liquids due to the danger of（）.Athe CO2 being inhaled by personnelBreflash of burning liquidsCvapor condensation on the extinguisherDthe discharge causing a static spark
单选题Dry chemical fire extinguishers are effective on which type(s) of fire?（）ABurning oilBElectricalCPaintDAll of the above
单选题Any extinguishing agent used on a Class “C” fire must have which important property? （）ACooling abilityBLeaves no residueCPenetrating powerDNonconductivity