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单选题
As an extinguishing agent，foam（）.
A
conducts electricity
B
should be directed at the base of the fire
C
is most effective on burning gases which are flowing
D
extinguishes by cooling oil fires below ignition temperature
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单选题A portable foam fire extinguisher is placed in operation by（）A
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单选题Production of mechanical foam by a portable in-line foam proportioner（）.A
increases the size of foam bubbles formedB
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单选题Which extinguishing agent is recommended in the Chemical Data Guide for use on a carbon disulfide fire?（）A
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单选题On a bulk chemical carrier，water should NOT be used as an extinguishing agent to fight a fire if the water may come into contact with the chemical called（）.A
acrylic acidB
benzeneC
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单选题A class B fire is most successfully fought by（）.A
preventing oxygen from reaching the burning materialB
cooling the burning material below its ignition temperatureC
using the extinguishing agent to make the burning material fire-resistantD
using the extinguishing agent to absorb the heat
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单选题What is an advantage of using foam in fire fighting?（）A
It is effective in controlling fire in flowing oil such as coming from a broken fuel lineB
It absorbs heat from materials that could cause reignitionC
Most foams can be used jointly with dry chemical extinguishing agents to attack a fire by two methods of extinguishmentD
Once the surface is blanketed with foam and the fire is extinguished，no further foam is required
考题
单选题Generally, the first action in extinguishing an LFG fire caused by escaping gas is to（）.A
sweep flames away with water sprayB
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单选题Water is a very effective fire extinguishing agent because it（）A
will remove all the toxic fumes from the airB
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单选题Which extinguishing agent is the best for use on electrical fires?（）A
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单选题Which fire extinguishing agent can NOT be used on an ethylenediamine?（）A
Water foamB
Dry chemical powderC
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单选题Which extinguishing agent will cool down a heated bulkhead in the least amount of time?（）A
Water streamB
Water fog or aprayC
SteamD
Dry chemical
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单选题Which extinguishing agent is NOT recommended in the Chemical Data Guide for use on a cyclohexane fire?（）A
FoamB
Carbon dioxideC
Dry chemicalD
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单选题The best method of extinguishing a class A fire is to（）.A
remove oxygen from the areaB
cool fuel below ignition temperatureC
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smother fire with foam
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单选题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 vaporB
absorption of smoke and gases as water is converted from a liquid to a vaporC
rapid contraction as water is converted from a liquid to a vaporD
rapid expansion as water absorbs heat and changes to steam
考题
单选题What is the most important characteristic of the extinguishing agent in fighting a class C fire?（）A
WeightB
TemperatureC
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Cost
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单选题Which of the following statements is true concerning Halon 1301 fire extinguishing equipment?（）A
The agent is considered nontoxic at room temperature in low concentrationsB
The agent is less effective than carbon dioxideC
Halon primarily extinguishes the fire by coolingD
The agent cannot be used on electrical fires because it leaves a residue
考题
单选题Which of the following statements is true concerning carbon dioxide when used as a fire extinguishing agent?（）A
Carbon dioxide is corrosive when exposed to fireB
Carbon dioxide should be applied slowly to a large engine room fireC
Its total cooling effect is far greater than waterD
Its smothering effect is excellent for class B fires
考题
多选题On what conditions may an exemption certificate，exempting from the requirement to install a fixed fire extinguishing system in a cargo space，be issued？（）AThe ship is constructed and solely intended for carriage of ore， coal， grain， unseasoned timber， non-combustible cargoes or cargoes which according to the Administration constitute a low fire riskBSteel hatch covers and effective means of closing all ventilators and other openings to the cargo space are fittedCA fixed deck foam system is be fitted in lieu of the cargo space extinguishing systemDThe vessel is less than 10 000 gross tonnage
考题
单选题An extinguishing agent which effectively cools，dilutes combustible vapors，removes oxygen，and provides a heat and smoke screen is（）.A
carbon dioxideB
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dry chemicalD
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考题
单选题0ne of the limitations of foam as an extinguishing agent is that foam（）.A
cannot be made with salt waterB
is heavierthan oil and sinks below its surfaceC
is corrosive and to fire fightersD
conducts electricity
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sweep flames away with water sprayB
shut off the leakC
use a chemical foam fire extinguisherD
call the local fire department
考题
单选题Where foam extinguishing systems are provided on a ship，each machinery flat in the protected space must have a(n)（）.A
coamingB
alarmC
drainD
fire sensor
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