Halon fire extinguishers are NOT effective when used on which types of fires?（）

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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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• Due to the hazards involved with Halon extinguishers on a ship，the size II extinguisher may only be used（）.

  A . outside B . on class C fires C . in an emergency D . on class B fire

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• Halon fire extinguishers are NOT effective when used on which types of fires?（）

  A . Fires in electrical equipment B . Flammable oils and greases C . Class A fires in ordinary combustibles D . Materials containing their own oxyge

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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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• Halon extinguishers used on a class C fire should be directed at the（）.

  A . base of the equipment B . top of the equipment C . power source D . source of the fire

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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 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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• 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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• 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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• Halon from extinguishers used on a class B fire，should be directed（）.

  A . at the top of the flames B . at the base of the fire near the edge C . in short quick bursts D . toward the upwind side of the fire

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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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