网友您好， 请在下方输入框内输入要搜索的题目：
题目内容
（请给出正确答案）
Firefighting foam is only effective when the foam _____.
A.penetrates to the bottom of the fire
B.is kept saturated with low-velocity water fog
C.mixes with the burning fuel oil
D.completely covers the top of the burning liquid
参考答案
更多 “ 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 ” 相关考题
考题
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
考题
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
考题
The most effective way to apply a foam stream if the fire is on deck or is a runing fire, is to direct the stream ______.A.onto the surface of the burning liquidB.ahead of the burning liquid and bounce it on the fireC.at the base of the burning liquid in a sweeping motionD.just above the surface of the burning liquid
考题
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
考题
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
考题
Foam is a very effective smothering agent and ______.A.it provides cooling as a secondary effectB.works well on extinguishing electrical firesC.can be used to combat combustible metal firesD.All of the above
考题
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
考题
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
考题
单选题Portable foam type fire extinguishers are most effective on（）.A
mattress firesB
oil firesC
wood firesD
All of the above
考题
单选题Which firefighting method is an example of an indirect attack on a fire?（）.A
Bouncing a straight stream of water off the overhead to create spray effectB
Spraying foam on a bulkhead and letting it flow down and over a pool of burning oilC
Flooding a paint locker with CO2 and sealing the compartmentD
Cooling adjacent bulkheads with water to prevent the spread of the fire by conduction
考题
单选题What is an advantage of using foam in fire fighting?（）A
It is MOST effective on very hot oil fires where the temperatures of the liquid exceed 100°C (212°F)B
Most foams can be used with dry chemicals to attack a fire by two methodsC
Foam is effective on combustible metal firesD
Foam can be made with seawater or fresh water
考题
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
考题
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
考题
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
考题
单选题As an extinguishing agent，foam（）.A
conducts electricityB
should be directed at the base of the fireC
is most effective on burning gases which are flowingD
extinguishes by cooling oil fires below ignition temperature
考题
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
考题
单选题When entering a foam injected space （） breathing apparatus.A
put outB
put onC
take offD
take in
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
考题
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
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
考题
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
热门标签
最新试卷