更多"Halon fire extinguishers are NOT ef"的相关试题:
[单项选择]Halon fire extinguishers are NOT effective when used on which types of fires?（）
A. Fires in electrical equipment
B. Flammable oils and greases
C. Class "A" fires in ordinary combustibles
D. Materials containing their own oxygen
[单项选择]Dry chemical fire extinguishers are effective on which type(s) of fire?（）
A. Burning oil
B. Electrical
C. Paint
D. All of the above
[单项选择]Halon extinguishes fire primarily by（）.
A. cooling
B. smothering
C. shielding of radiant heat
D. breaking the chain reaction
[单项选择]Halon extinguishes a fire by（）.
A. breaking the chain reaction
B. smothering the fire
C. cooling the fire
D. coating the fule with a nonflammable surface
[单项选择]Which is a disadvantage of Halon as a fire extinguishing medium?（）
A. Conducts electricity
B. Difficult to store
C. Large volume necessary to be effective
D. Ineffective in powdered metal fires
[单项选择]You will extinguish a fire when you remove（）.
A. nitrogen
B. oxygen
C. sodium
D. carbon dioxide
[单项选择]Halon extinguishers used on a class C fire should be directed at the（）.
A. base of the equipment
B. top of the equipment
C. power source
D. source of the fire
[单项选择]Halon from extinguishers used on a class B fire，should be directed（）.
A. at the top of the flames
B. at the base of the fire near the edge
C. in short quick bursts
D. toward the upwind side of the fire
[单项选择]A fire starts when the following （） factors come together.
A. combustible material
B. ignition source
C. oxygen
D. A and B and C
[单项选择]When two fire hose teams are attacking a fire they should（）.
A. use different fire hose pressures
B. use fire hoses of different sizes
C. not attack the fire from opposite sides
D. not wear protective clothing
[单项选择]When fire pumps are used for other than firefighting service，each pipe connecting the other service (except for branch lines used for deck washing) must have a（）.
A. check valve installed in the line
B. shut off valve at a manifold near the pump
C. quick disconnect union within ten feet of the pump
D. regulator in the line set at 125 psi
[单项选择]When should a fire be ventilated?（）
A. When attacking the fire directly
B. When using a steam smothering system
C. When using the fixed CO2 system
D. All of the above
[单项选择]When fighting a fire with a portable dry chemical fire extinguisher，the stream should be directed（）.
A. over the top of the flames
B. off a bulkhead into the fire
C. in front of the fire
D. at the base of the fire
[单项选择]When fighting a spreading fire resulting from a broken fuel line, you should FIRST （）.
A. look for a CO2 extinguisher
B. use a soda acid extinguisher
C. shut off the fuel supply
D. smother the fire with rags
[单项选择]When fighting an electrical fire, you should first （）.
A. stop ventilation to the area
B. stop the vessel
C. secure electricity to the circuit
D. apply CO2 to the fire
[单项选择]When must a dry chemical fire extinguisher be recharged?（）
A. After each use
B. When the air temperature exceeds 90°F
C. Every 6 months
D. Every 12 months
[单项选择]When joining the female coupling of the fire hose to the male outlet of the hydrant，you should make sure that the（）.
A. threads are lubricated
B. nozzle is attached to the hose
C. female coupling has a gasket
D. hose is led out
