Which of the following statements is t...

单项选择题Which of the following statements is true concerning Halon 1301 fire extinguishing equipment?（）

A.The agent is considered nontoxic at room temperature in low concentrations
B.The agent is less effective than carbon dioxide
C.Halon primarily extinguishes the fire by cooling
D.The agent cannot be used on electrical fires because it leaves a residue

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1.单项选择题In order to find out which lifeboat you are assigned, you should look at the （）.

A.Certificate of Inspection
B.Station Bill
C.Ships Articles
D.Fire Control Plan

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2.单项选择题You may improve a vessels stability by （）.

A.keeping the fuel tanks topped off
B.increasing the free surface effect
C.keeping the fuel tanks at least half MI
D.keeping at least one fuel tank empty for slops

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3.单项选择题When reentering an engine room that has been flooded with CO₂, the investigating team should initially（）.

A.leave the access door partially open
B.enter from the lowest level
C.enter from the highest level
D.attempt to operate machinery

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4.单项选择题If there has been a fire in a closed unventilated compartment it may be unsafe to enter because of （）.

A.unburned carbon particles
B.excess nitrogen
C.a lack of oxygen
D.excess hydrogen

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5.单项选择题After a fire has been extinguished in a closed space, personnel may safely enter the space when （）.

A.smoke density has been decreased sufficiently to see the bulkhead opposite the compartments entrance
B.a lifeline and explosion proof flash light are used
C.all smoke and toxic fumes are removed and an adequate oxygen supply is present
D.overhaul has been completed to remove any possible source of re-ignition

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6.单项选择题Which of the petroleum products listed has the lowest flash point?（）

A.Hydraulic oil
B.Lubricating oil
C.Diesel oil
D.Refrigeration oil

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7.单项选择题Which of the listed fire extinguishers is recommended for use on an electrical switchboard fire?（）

A.CO₂
B.ABC dry chemical
C.CO₂propelled foam
D.All of the above

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8.单项选择题Which of the fire extinguishing agents listed is the safest to use when combating a class C fire?（）

A.CO₂
B.Foam
C.Water fog
D.Soda acid

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9.单项选择题Which of the following represents the emergency signal for fire aboard ship?（）

A.More than six short blasts and one long blast on the whistle
B.Continuous blast of the ships whistle for a period of not less than 10 seconds supplemented by the same signal on the general alarm
C.Three short blasts of the whistle supplemented by the same signal on the general alarm
D.More than six short blasts and one long blast on the whistle supplemented by the same signal on the general alarm

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10.单项选择题To extinguish an electrical fire, you should use （）.

A.mechanical foam
B.chemical foam
C.carbon dioxide
D.soda acid

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