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When compared to a high-expansion foam，a low-expansion foam will ______．
A.Be dryer
B.Be lighter
C.Be less heat resistant
D.Not cling to vertical surfaces
参考答案
更多 “ When compared to a high-expansion foam，a low-expansion foam will ______．A.Be dryerB.Be lighterC.Be less heat resistantD.Not cling to vertical surfaces ” 相关考题
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One of the limitations of foam as an extinguishing agent is that foam ______.A.cannot be made with salt waterB.is heavier than oil and sinks below its surfaceC.is corrosive and a hazard to fire fightersD.conducts electricity
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The BEST method of applying foam to a fire is to ______.A.spray directly on the base of the fireB.flow the foam down a nearby vertical surfaceC.sweep the fire with the foamD.spray directly on the surface of the fire
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If a fixed foam firefighting system on a ship is not of the premix type，a sample of the foam liquid must be tested by ______.A.a Coast Guard inspection officerB.the safety man aboard the unitC.the designated person in charge of the unitD.the manufacturer or his authorized representative
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Firefighting foam is only effective when the foam _____.A.penetrates to the bottom of the fireB.is kept saturated with low-velocity water fogC.mixes with the burning fuel oilD.completely covers the top of the burning liquid
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Never extinguish oil and electrical fires with （）.A、waterB、foam extinguisherC、CO2 extinguisherD、portable extinguisher
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单选题A portable foam fire extinguisher is placed in operation by（）A
turning it upside downB
pressing the foam leverC
squeezing the grip handleD
opening the hose valve
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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
increases the rate of foam productionC
improves the extinguishing properties of foamD
gives the nozzleman more freedom of movement，since it can be placed anywhere in the hose line
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单选题Portable foam type fire extinguishers are most effective on（）.A
mattress firesB
oil firesC
wood firesD
All of the above
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单选题Compared to the amount of concentrated foam liquid used，the amount of low expansion mechanical foam produced is（）.A
97 times greaterB
94 times greaterC
10 times greaterD
2 times greater
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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Which of the following statements regarding low expansion foam and its application is INCORRECT?（）.A
Foam should not be used on electrical firesB
One kilo of low expansion foam solution produces much more foamC
Foam is only efficient when it covers the top of burning combustiblesD
A stream of foam should be deflected off the deck in order to best agitate the fire
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单选题Which statement about firefighting foam is TRUE?（）A
Foam conducts electricityB
To be most effective，foam should be directed at the base of the fireC
Foam is most effective on burning liquids which are flowingD
Foam can ONLY be used to extinguish class A fires
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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When there is a fire in a large electric motor, normally the very FIRST step is to （）A
secure the electric supplyB
ventilate area to remove smokeC
start the fire pump and lead out hoseD
apply foam
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单选题When entering a foam injected space （） breathing apparatus.A
put outB
put onC
take offD
take in
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单选题When an oil fire has been extinguished, the surface of the oil should be kept covered with foam to prevent （）.A
air from contacting the oil vaporsB
permitting re-ignition boiling of the heated oilC
spontaneous combustion below the oil surfaceD
toxic fumes from escaping to the surface
考题
单选题The usual method of effectively applying foam on a fire is by （）.A
spraying directly on the base of the fireB
flowing the foam down a vertical surfaceC
sweeping the fire before you with the foamD
spraying directly on the surface of the fire
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单选题The BEST method of applying foam to a fire is to（）.A
spray directly on the base of the fireB
flow the foam down a nearby vertical surfaceC
sweep the fire with the foamD
spray directly on the surface of the fire
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单选题When possible，what should be the FIRST step in combating a fire on deck resulting from a cargo overflow or a leaking cargo line?（）A
Blanket the cargo spill with foamB
Prevent the spread of fire with a foam damC
Apply CO2 on burning fuel at its sourceD
Shut off the transfer of cargo
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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单选题Deck foam systems，designed to protect cargo areas on tankers built after January 1，1975，must have a supply of foam-producing material to operate the system at its designed rate of foam production for（）.A
15 minutes without rechargingB
20 minutes without rechargingC
25 minutes without rechargingD
30 minutes without recharging
考题
单选题Firefighting foam is only effective when the foam（）.A
penetrates to the bottom of the fireB
is kept saturated with low-velocity water fogC
mixes with the burning fuel oilD
completely covers the top of the burning liquid
考题
单选题The foam extinguisher should be used （）.A
in the endB
upside downC
down sideD
on top
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