After extinguishing a fire with CO2，it is advisable to（）.

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• After extinguishing a paint locker fire using the fixed CO2 system，the next action is to have the space（）.

  A . opened and burned material removed B . left closed with vents off until all boundaries are cool C . checked for oxygen content D . doused with water to prevent reflash

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• 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?（）

  A . Dry chemical B . Halon C . Low velocity fog D . Steam

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• CO2 extinguishes a fire by （）.

  A . a blanket of bubbles formed on the surface of the fire B . smothering C . cooling D . isolating the heat from the fuel

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• Removing which will extinguish a fire?（）.

  A . Nitrogen B . Carbon dioxide C . Sodium D . Oxyge

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• When must a dry chemical fire extinguisher be recharged?（）

  A . After each use B . When the air temperature exceeds 90°F C . Every 6 months D . Every 12 month

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• A portable foam (stored-pressure type) fire extinguisher would be most useful in combating a fire in（）.

  A . generators B . oil drums C . the bridge controls D . combustible metal

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• Halon extinguishes a fire by（）.

  A . breaking the chain reaction B . smothering the fire C . cooling the fire D . coating the fuel with a nonflammable surface

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• Foam extinguishes a fire by（）.

  A . shutting off the air supply B . cooling the fuel to below ignition temperature C . dispersing the fuel D . removing the source of ignitio

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• A large oil fire is best extinguished with（）

  A . soda acid B . foam C . CO D . sand

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• A carbon dioxide fire extinguisher should be recharged（）.

  A . at least annually B . whenever it is below its required weight C . only if the extinguisher has been used D . before every safety inspectio

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• 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-ignitio

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• Which is a disadvantage of Halon as a fire extinguishing medium?（）

  A . Conducts electricity B . Difficult to store C . Large volume necessary to be effective D . Ineffective in powdered metal fire

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• A fire can be extinguished by removing （）.

  A . the heat B . the fuel C . the oxygen D . any of the above

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• A foam-type portable fire extinguisher would be most useful in combating a fire in（）.

  A . soild materials such as wood or bales of fiber B . flammable liquids C . a piece of electrical equipment D . combustible metallic solid

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• C02 extinguishes a fire by（）.

  A . cooling B . smothering C . chemical action D . All of the above

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• How do you operate a portable C02 fire extinguisher?（）.

  A . Point the horn down B . Turn cylinder upside-down C . Break the rupture disc D . Pull pin, squeeze gri

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• Foam extinguishes a fire mainly by（）.

  A . cooling B . chemical action C . smothering D . inerting the air

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• A foam-type portable fire extinguisher is most useful in fighting a fire in（）.

  A . generators B . oil drums C . the bridge controls D . combustible metal

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• An “ABC” dry chemical fire extinguisher would be LEAST effective against a fire in（）.

  A . a mattress B . spilled liquids such as oil or paint C . high voltage electrical gear D . a trash ca

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• CO2 extinguishes a fire by（）.

  A . cooling B . smothering C . chemical action D . All of the above

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• An ABC dry chemical fire extinguisher would be least effective against a fire in（）.

  A . a mattress B . spilled liquids such as oil or paint C . high voltage electrical gear D . a trash ca

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• Which portable fire extinguisher should be used on a class C fire on board a vessel?（）

  A . Carbon dioxide B . Water (stored pressure) C . Foam D . Carbon tetrachloride

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