This fire extinguisher is to be used only in case of（）.

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• A definite advantage of using water as a fire extinguishing agent is its characteristic of（）.

  A . alternate expansion and contraction as water in a liquid state becomes a vapor B . absorption of smoke and gases as water is converted from a liquid to a vapor C . rapid contraction as water is converted from a liquid to a vapor D . rapid expansion as water absorbs heat and changes to steam

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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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• 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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• Water is a very effective fire extinguishing agent because it（）

  A . will remove all the toxic fumes from the air B . has the greatest cooling ability C . will leave no harmful residue D . completely removes combustible vapors from the air

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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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• An advantage of a dry chemical over a carbon dioxide fire extinguisher is its（）.

  A . greater range B . effectiveness on all types of fires C . cleanliness D . All of the above

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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 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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• Which of the listed extinguishing agents is NOT suitable for fighting a liquid paint fire?（）

  A . Dry chemical B . Foam C . Water D . Carbon dioxide

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• A crew member reports that the high-pressure alarm light of a low-pressure CO2 fixed fire extinguishing system is illuminated. The most probable cause of this condition would be that（）.

  A . an air leak has developed in the tank B . the tank cooling system has malfunctioned C . the pilot cylinder discharge valve is leaking D . an excessive amount of insulation has been installed on the tank and piping

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• Which characteristic is an advantage of Halon as a fire extinguishing medium?（）

  A . Electrically non-conductive B . Relatively inexpensive C . Effective against chemicals containing an oxidizer D . All of the above

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• Which portable fire extinguisher is normally recharged in a shore facility?（）

  A . Dry chemical (cartridge-operated) B . Water (cartridge-operated) C . Water (pump tank) D . Carbon dioxide

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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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• 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 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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• An advantage of a dry chemical over a carbon dioxide fire extinguish is its（）.

  A . greater range B . effective on all types of fires C . cleanliness 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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• 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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• What is NOT a characteristic of carbon dioxide fire-extinguishing agents?（）

  A . Effective even if ventilation is not shut down B . Will not deteriorate in storage C . Non-corrosive D . Effective on electrical equipment

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• The class of fire on which a blanketing effect is essential to extinguish the fire is （）.

  A . class A B . class B C . class C D . class D

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• Which of the listed fire extinguishers is recommended for use on an electrical switchboard fire？

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

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• There is an electric fire. Get the ________ extinguisher.

  A.foam B.water C.dry powder

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