更多"Foam is a very effective smothering"的相关试题:
[单项选择]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
[单项选择]Water is a very effective fire extinguishing agent because it（）
A. will remove all the toxic fumes from the air
B. has the greatest cooling ability
C. will leave no harmful residue
D. completely removes combustible vapors from the air
[单项选择]As an extinguishing agent,foam（）.
A. couducts 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 blow ignition temperature
[单项选择]Which extinguishing agent is effective in combating an isoprene fire?（）
A. Dry chemicals
B. CO2
C. Foam
D. All the above
[单项选择]Which extinguishing agent is most effective on a mattress fire?（）
A. CO2
B. Foam
C. Dry Chemical
D. Water
[单项选择]Class B fires are best extinguished by smothering, i-e（）.
A. deprival of oxygen
B. removal of heat
C. spraying of water
D. injecting of soda-acid
[单项选择]In setting the valves on a steam-smothering system on a tanker，the master control valve to cargo tanks should be（）.
A. open and individual tank valves open
B. open and the individual tank valves closed
C. closed and the individual tank valves closed
D. closed and the individual tank valves open
[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]Where foam extinguishing systems are provided on a ship，each machinery flat in the protected space must have a(n)（）.
A. coaming
B. alarm
C. drain
D. fire sensor
[单项选择]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 recharging
B. 20 minutes without recharging
C. 25 minutes without recharging
D. 30 minutes without recharging
[单项选择]One of the limitations of foam as an extinguishing agent is that foam（）.
A. cannot be made with salt water
B. is heavier than oil and sinks below its surface
C. is corrosive and a hazard to fire fighters
D. conducts electricity
[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]Foam extinguishes a fire mainly by（）.
A. cooling
B. chemical action
C. smothering
D. inerting the air
[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]0ne of the limitations of foam as an extinguishing agent is that foam（）.
A. cannot be made with salt water
B. is heavierthan oil and sinks below its surface
C. is corrosive and to fire fighters
D. conducts electricity
