更多"Halon from extinguishers used on a "的相关试题:
[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 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]Any extinguishing agent used on a Class C fire must have which important property?（）
A. Cooling ability
B. Leaves no residue
C. Penetrating power
D. Nonconductivity
[单项选择]Any extinguishing agent used on a Class “C” fire must have which important property? （）
A. Cooling ability
B. Leaves no residue
C. Penetrating power
D. Nonconductivity
[单项选择]Fire extinguishing agents used on Class C fires must be（）.
A. able to absorb heat
B. water based
C. nonconducting
D. nontoxic
[单项选择]On a class B fire，which portable fire extinguisher would be the LEAST desirable?（）
A. Carbon dioxide
B. Water (stored pressure)
C. Dry chemical
D. Foam
[单项选择]On a class “B” fire，which portable fire extinguisher would be the LEAST desirable?（）
A. Carbon dioxide
B. Water (stored pressure)
C. Dry chemical
D. Foam
[单项选择]Dry chemical extinguishers extinguish class B fires to the greatest extent by（）.
A. cooling
B. smothering
C. oxygen dilution
D. breaking the chain reaction
[单项选择]A high-velocity fog stream can be used in fire fighting situations to drive heat and smoke ahead of the fire fighters in a passageway. This technique should only be used when（）.
A. using a 2-1/2 inch hose
B. there is an outlet for the smoke and heat
C. the fire is totally contained by the ship's structure
D. at least two fog streams can be used
[单项选择]A class C fire would be burning（）.
A. fuel oil
B. wood
C. celluloid
D. electrical insulation
[单项选择]The best method of extinguishing a class A fire is to （）.
A. remove oxygen from the area
B. smother fire with foam
C. smother fire with CO2
D. cool fuel below ignition temperature
[单项选择]The class of fire on which a blanketing effect is essential to extinguish the fire is （）.
A. class A
B. class B
C. class C
D. class D
[单项选择]A class B fire is most successfully fought by（）.
A. preventing oxygen from reaching the burning material
B. cooling the burning material below its ignition temperature
C. using the extinguishing agent to make the burning material fire-resistant
D. using the extinguishing agent to absorb the heat
[单项选择]If ignited，which material would be a class B fire?（）
A. Magnesium
B. Paper
C. Wood
D. Diesel Oil
[单项选择]A class "C" fire is burning （）.
A. diesel oil
B. magnesium
C. dunnage
D. electrical insulation
[单项选择]A class "C" fire would occur in （）
A. bedding
B. pipe insulation
C. paint
D. a generator
[单项选择]Before attempting to put out a class “C” fire involving an electric-driven centrifugal pump, you should FIRST （）.
A. insulate your shoes
B. ground the fire hose
C. secure its power supply
D. start the fire pump
