C02 extinguishes a fire by（）.

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• Class B fires are best extinguished by smothering, i-e（）.

  A . deprival of oxygen B . removal of heat C . spraying of water D . injecting of soda-acid

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• To determine if a C02 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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• 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 discharge a C02 portable fire extinguisher , the operator must first（）.

  A . invert the CO extinguisher B . squeeze the two trigger handles together C . remove the locking pin D . open the discharge valve

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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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• Dry chemical extinguishers extinguish class B fires to the greatest extent by（）.

  A . cooling B . smothering C . oxygen dilution D . breaking the chain reactio

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• Fire extinguishers used on ship’s are numbered by size I through V，with I being（）.

  A . used for electrical fires only B . the smallest C . the most accessible D . the most effective

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• 0n a vessel ,a C02 extinguisher is 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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• 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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• 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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• A C02 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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• 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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• CO2 extinguishes a fire by（）.

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

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• 178．Fire in electrical equipment should be extinguished by using ____

  A、 salt water B、 foam C、 low velocity fog D、 co2

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