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单选题
Fire extinguishing agents used on Class C fires must be（）.
A
able to absorb heat
B
water based
C
nonconducting
D
nontoxic
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Halogenated hydrocarbon， Halon in short form，is used on board ship as ________ ．A.fire-extinguishing mediumB.a standard fire testC.a non-combustible materialD.a fire main
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单选题Halon fire extinguishers are NOT effective when used on which types of fires?（）A
Fires in electrical equipmentB
Flammable oils and greasesC
Class A fires in ordinary combustiblesD
Materials containing their own oxygen
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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
oleumD
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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Each hand portable，semi-portable and fixed fire extinguishing unit on a ship must be tested and inspected at least once every（）.A
six weeksB
six monthsC
twelve monthsD
two years
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单选题Which is a disadvantage of Halon as a fire extinguishing medium?（）A
Conducts electricityB
Difficult to storeC
Large volume necessary to be effectiveD
Ineffective in powdered metal fires
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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
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单选题For which of the listed classes of fire combinations would carbon dioxide be most suitable as the extinguishing agent （）.A
Class A and class BB
Class B and class CC
Class A and class CD
Class C, class D, and class E
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单选题Carbon dioxide flooding system is used for extinguishing fires because it reduces the concentration of oxygen in the air to（）.A
flashing pointB
combustion pointC
auto-ignition pointD
lower explosive limit
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单选题Which portable fire extinguisher should be used on a class C fire on board a vessel?（）A
Carbon dioxideB
Water (stored pressure)C
FoamD
Carbon tetrachloride
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单选题Which fire extinguishing agent can NOT be used on an ethylenediamine?（）A
Water foamB
Dry chemical powderC
Water fogD
Alcohol foam
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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
smother with CO2D
smother fire with foam
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单选题Which characteristic of Halon is a disadvantage when it is used as a fire extinguishing medium?（）A
Leaves a residueB
Cost，relative to other agentsC
Breaks down while under prolonged storageD
Conducts electricity
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单选题What is the most important characteristic of the extinguishing agent in fighting a class C fire?（）A
WeightB
TemperatureC
Electrical nonconductivityD
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
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单选题Which of the fire extinguishing agents listed is the safest to use when combating a class C fire?（）A
CO2B
FoamC
Water fogD
Soda acid
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单选题What is NOT a characteristic of carbon dioxide fire-extinguishing agents?（）A
Effective even if ventilation is not shut downB
Will not deteriorate in storageC
Non-corrosiveD
Effective on electrical equipment
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单选题The best method of extinguishing a class A fire is to （）.A
remove oxygen from the areaB
smother fire with foamC
smother fire with CO2D
cool fuel below ignition temperature
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单选题Which of the listed extinguishing agents is NOT suitable for fighting a liquid paint fire?（）A
Dry chemicalB
FoamC
WaterD
Carbon dioxide
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单选题All portable fire extinguishers must be capable of being（）.A
carried by hand to a fireB
carried or rolled to a fireC
recharged in the fieldD
used on class 'B' fires
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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
单选题Halon extinguishers used on a class C fire should be directed at the（）.A
base of the equipmentB
top of the equipmentC
power sourceD
source of the fire
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单选题Due to the hazards involved with Halon extinguishers on a ship，the size II extinguisher may only be used（）.A
outsideB
on class C firesC
in an emergencyD
on class B fires
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单选题Any extinguishing agent used on a Class “C” fire must have which important property? （）A
Cooling abilityB
Leaves no residueC
Penetrating powerD
Nonconductivity
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单选题All portable fine extinguishers must be capable of being（）.A
carried by hand to a fireB
carried or rolled to a fireC
recharged in the fieldD
used on class B fires
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