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A、Foam fire extinguishers

B、CO₂ fire extinguishers

C、NO₂ fire extinguishers

D、Liquid fire extinguishers

A.mechanical foam

B.chemical foam

C.carbon dioxide

D.soda acid

The longer an oil fire is permitted to burn, the _____.

A.harder it is to extinguish

B.easier it is to extinguish

C.less chance there is of re-ignition

D.easier it is to control

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

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

A.Any one component can be eliminated to extinguish a fire

B.Any two components must be eliminated to properly extinguish a fire

C.Any three components must be eliminated to properly extinguish a fire

D.Ali four components must be eliminated to extinguish any fire

A.air from contacting the oil vapors

B.permitting re-ignition boiling of the heated oil

C.spontaneous combustion below the oil surface

D.toxic fumes from escaping to the surface

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

The usual method of effectively applying foam on a fire is by ______.

A.spraying directly on the base of the fire

B.flowing the foam down a vertical surface

C.sweeping the fire before you with the foam

D.spraying directly on the surface of the fire