單項選擇題Accumulations of oily rags should be（）.

A.kept in nonmetal containers
B.discarded as soon as possible
C.cleaned thoroughly for reuse
D.kept in the paint locker


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1.單項選擇題Fire extinguishing agents used on Class C fires must be（）.

A.able to absorb heat
B.water based
C.nonconducting
D.nontoxic

2.單項選擇題Fire in an engine compartment is best extinguished with carbon dioxide gas (CO2) and by（）.

A.closing the compartment except for the ventilators
B.completely closing the compartment
C.leaving the compartment open to the air
D.increasing the air flow to the compartment by blowers

3.單項選擇題High-velocity fog（）.

A.is a finer，more diffuse water spray than low-velocity fog
B.requires that the water pressure be no greater than 60 psi
C.produces an effective fog pattern no more than 6 feet beyond the nozzle
D.extinguishes a fire by absorbing heat and reducing the supply of oxygen

4.單項選擇題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

5.單項選擇題Except in rare cases，it is impossible to extinguish a shipboard fire by（）.

A.removing the heat
B.removing the oxygen
C.removing the fuel
D.interrupting the chain reaction

6.單項選擇題CO2 cylinders，which protect the small space in which they are stored must（）.

A.NOT contain more than 200 pounds of CO2
B.be automatically operated by a heat actuator
C.have an audible alarm
D.All of the above

7.單項選擇題Generally，the first action in extinguishing an LFG fire caused by escaping gas is to（）.

A.sweep flames away with water spray
B.shut off the leak
C.use a chemical foam fire extinguisher
D.call the local fire department

8.單項選擇題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

9.單項選擇題How do you operate a portable CO2 fire extinguisher?（）.

A.Point the horn down
B.Turn cylinder upside-down
C.Break the rupture disc
D.Pull pin，squeeze grip

10.單項選擇題Gas masks（）.

A.should be worn while fighting a fire
B.can be used in atmospheres deficient in oxygen
C.filter contaminants from air that is to be breathed
D.may be substituted for a self-contained breathing apparatus