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
相似题目
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When two fire hose teams are attacking a fire they should（）.
A . use different fire hose pressures
B . use fire hoses of different sizes
C . not attack the fire from opposite sides
D . not wear protective clothing
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Fire and lifeboat stations are required to be listed on the （）.
A . ships articles
B . muster list
C . bunk card
D . forecastle card
-
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
-
Fusible-link fire dampers are operated by（）.
A . 8the heat of a fire melting the link
B . a break-glass and pull-cable system
C . electrical controls on the bridge
D . a mechanical arm outside the vent duct
-
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
-
Portable foam type fire extinguishers are most effective on（）.
A . mattress fires
B . oil fires
C . wood fires
D . All of the above
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All of the following are part of the fire triangle EXCEPT（）.
A . electricity
B . fuel
C . oxygen
D . heat
-
Dry chemical fire extinguishers are effective on which type(s) of fire?（）
A . Burning oil
B . Electrical
C . Paint
D . All of the above
-
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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Foam-type portable fire extinguishers are more usefull in combating fires involving（）.
A . solid materials such as wood or bales of fiber
B . inflammable liquids
C . electrical equipment
D . metallic solid
-
A large oil fire is best extinguished with（）
A . soda acid
B . foam
C . CO
D . sand
-
Fires involving combustible metals are classified as （）.
A . class "A" fires
B . class "B" fires
C . class "C" fires
D . class "D" fire
-
Fire alarm system thermostats are actuated by（）.
A . smoke sensors
B . the difference in thermal expansion of two dissimilar metals
C . pressure loss due to air being heated
D . an electric eye which actuates when smoke interferes with the beam
-
Class C fires are best extinguished by （）.
A . foam extinguishers
B . water spray equipment
C . dry powder extinguishers
D . soda-acid extinguisher
-
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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Fusible plugs are installed in fire-tube boilers to （）.
A . provide a means of draining the boiler
B . warn the engineer of low water level
C . cool the crown sheet at high firing rates
D . open the burners electrical firing circuit
-
Automatic fire dampers in ventilation systems are operated by a（）.
A . remote operated valve
B . fusible link
C . CO
system pressure switch
D . heat or smoke detector
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The three basic elements necessary for any fire are （）.
A . heat, gas, and flames
B . fuel, heat, and oxygen
C . heat, nitrogen, and fuel
D . fuel oil, nitrogen, and oxyge
-
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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they are looking（） that fire case.
A．into
B．at
C．for
D．up
