默认题库 - 消防演习与作业

单选题

Halon extinguishes fire primarily by（）.

A. cooling
B. smothering
C. shielding of radiant heat
D. breaking the chain reactio

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单选题

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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单选题

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

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

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单选题

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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单选题

Flames from small leaks of LFG may be extinguished by（）.

A. utilizing carbon dioxide or dry chemical fire extinguishers
B. utilizing soda and acid fire extinguishers
C. blowing the flames out
D. letting it burn itself out

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单选题

Flame screens are used to（）.

A. contain flammable fumes
B. protect firefighters from flames
C. prevent flames from entering tanks
D. keep flames and sparks from getting out of an engine's exhaust system

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单选题

Fire extinguishers of sizes III，IV，and V are designated as（）.

A. portable
B. semi-portable
C. fixed
D. disposable

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