更多"What is an advantage of using foam "的相关试题:
[单项选择]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 line
B. It absorbs heat from materials that could cause reignition
C. Most foams can be used jointly with dry chemical extinguishing agents to attack a fire by two methods of extinguishment
D. Once the surface is blanketed with foam and the fire is extinguished，no further foam is required
[单项选择]A portable foam fire extinguisher is placed in operation by（）
A. turning it upside down
B. pressing the foam lever
C. squeezing the grip handle
D. opening the hose valve
[单项选择]Portable foam type fire extinguishers are most effective on（）.
A. mattress fires
B. oil fires
C. wood fires
D. All of the above
[单项选择]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 ignition
[单项选择]Foam extinguishes a fire mainly by（）.
A. cooling
B. chemical action
C. smothering
D. inerting the air
[单项选择]Foam-type portable fire extinguishers are more usefull in combating fires involving（）.
A. solid materials such as wood or bales of fiber
B. inflammable liquids
C. electrical equipment
D. metallic solids
[单项选择]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 solids
[单项选择]How does foam extinguish an oil fire?（）
A. By cooling the oil below the ignition temperature
B. By removing the fuel source from the fire
C. By excluding the oxygen from the fire
D. By increasing the weight of the oil
[单项选择]A foam-type portable fire extinguisher would be most useful in combating a fire in（）.
A. solid materials such as wood or bales of fiber
B. flammable liquids
C. a piece of electrical equipment
D. combustible metallic solids
[单项选择]A foam-type portable fire extinguisher is most useful in fighting a fire in（）.
A. generators
B. oil drums
C. the bridge controls
D. combustible metals
[单项选择]The BEST method of applying foam to a fire is to（）.
A. spray directly on the base of the fire
B. flow the foam down a nearby vertical surface
C. sweep the fire with the foam
D. spray directly on the surface of the fire
[单项选择]A definite advantage of using water as a fire extiguishing agent is its characteristic of（）.
A. alternate expansion and contraction as water in a liquid state becomes a vapor
B. absorption of smoke and gases as water is converted from a liquid to a vapor
C. rapid contraction as water is converted from a liquid to a vapor
D. rapid expansion as water absorbs heat and changes to steam
[单项选择]According to the regulations，what fire safety control feature is required in quick-closing shut off valves?（）
A. Electrical cut off switch
B. A fusible link
C. Manual cut off switch
D. A water spray actuator
