Fires involving combustible metals are classified as （）.

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

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  A . allowing better access in an emergency B . eliminating potential fuel sources C . eliminating trip hazards D . improving personnel qualificatio

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• To avoid scavenge fires occurring the engine timing and equipment maintenance （）.

  A . should be correctly carried out B . should correctly be taken place C . should carded with care D . must to carry out with great care

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• Foam-type portable fire extinguishers are most useful in combating fires involving（）.

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

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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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  A . removing the oxygen B . cooling the fire below the ignition temperature C . removing combustible material D . diluting combustible vapor

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• The emergency signal for fires is sounded on the ship’s whistle and general alarm as（）.

  A . a continuous ringing for 10 seconds B . one short ring followed by one long ring C . two long rings of at least 20 seconds D . a continuous ringing until the fire is extinguished

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• Fires resulting from spontaneous combustion are usually caused by the improper disposal of（）.

  A . cigarette butts B . oily rags C . burner torches D . lighted matche

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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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• What are the most important reasons for using water fog to fight fires?（）

  A . Smothers burning surfaces，organically destroys fuel B . Cools fire and adjacent surfaces，provides protective barrier C . Reaches areas not protected by steam or CO smothering systems D . Allows fire to be attacked from leeward，saturates liquid surface

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

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  A . occurred B . occurring C . not happening D . occur

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  A . attempt to isolate the fire from the LPG B . cool the bottles or remove them from the fire area C . see that the valves on all LPG bottles are closed D . place insulating material over the bottle

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