CO2 extinguishes a fire by（）.

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• How do you operate a portable CO2 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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• 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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• In order to release CO2 to the machinery spaces from a fixed fire extinguishing system, you must（）.

  A . actuate an alarm and open the engine room control valve B . actuate an alarm and open the engine room CO releasing valve C . open the engine room control valve and shut off engine room ventilation fans D . open the engine room control valve and then the CO releasing valve

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

  A . use all CO available to cool the surrounding area B . stand by with water or other agents C . thoroughly ventilate the space of CO D . jettison all burning material

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• Portable CO2 fire extinguishers should NOT be used to inert a space containing flammable liquids due to the danger of（）.

  A . the CO being inhaled by personnel B . reflash of burning liquids C . vapor condensation on the extinguisher D . the discharge causing a static spark

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• Which is the proper method of determining whether a portable CO2 fire extinguisher needs recharging?（）

  A . Check the tag to see when the extinguisher was last charged B . Release a small amount of CO ; if the CO discharges，the extinguisher is acceptable C . Weigh the extinguisher and compare the weight against that stamped on the valve D . Recharge the extinguisher at least once each year

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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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• Class C fires are best extinguished by （）.

  A . foam extinguishers B . water spray equipment C . dry powder extinguishers D . soda-acid extinguisher

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• 0il fires are best extinguish by（）.

  A . cutting off supply of oxygen B . removing the fuel C . cooling below the ignition temperature D . spraying with water

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• A fire of escaping liquefied flammable gas is best extinguished by（）.

  A . cooling the gas below the ignition point B . cutting off the supply of oxygen C . stopping the flow of gas D . interrupting the chain reactio

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• A CO2 portable extinguisher is annually checked by（）.

  A . reading the gage pressure B . weighing the extinguisher C . discharging a small amount of CO D . seeing if the seal has been broke

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• Except in rare cases,it is impossible to extinguish a shipboard fire by（）.

  A . removing the heal B . removing the oxygen C . removing the fuel D . interrupting the chain reactio

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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 portable foam fire extinguisher is placed in operation by（）

  A . turning it upside down B . pressing the foam lever C . squeezing the grip handle D . opening the hose valve

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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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• To determine if a CO2 fire extinguisher is fully charged，you would（）.

  A . Operate the trigger valve B . Weigh the extinguisher C . Test with a pressure gauge D . Read the date of last test

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• Except in rare cases, it is impossible to extinguish a shipboard fire by （）.

  A . removing the heat B . removing the oxygen C . removing the fuel D . interrupting the chain reactio

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• You can determine that a C02 fire extinguisher is fully charged by（）.

  A . looking at the gage B . checking the nameplate data C . weighing by hand D . weighing on a properly calibrated scale

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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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• Fire in an engine compartment is best extinguished with carbon dioxide gas (CO2) and by（）.

  A . completely closing the compartment B . closing the compartment except for the ventilators C . leaving the compartment open to the air D . increasing the air flow to the compartment by blower

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• Halon extinguishes fire primarily by（）.

  A . cooling B . smothering C . shielding of radiant heat D . breaking the chain reactio

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