更多"Fires involving combustible metals "的相关试题:
[单项选择]Fires occurring in combustible metals, such as sodium or magnesium, are classified as a （）.
A. class A
B. class B
C. class C
D. class D
[单项选择]Combustible gas indicators measure the presence of combustible gas as a percentage of the（）.
A. flash point
B. upper explosive limit
C. lower explosive limit
D. fire point
[单项选择]A combination combustible gas and oxygen indicator is an instrument that measures the（） of both combustible gas and oxygen; each is indicated on a separate meter.
A. purifies
B. combinations
C. concentrations
D. filters
[单项选择]Combustible material stored in a compartment adjacent to a compartment where there is a fire may be ignitedThis ignition can occur by （）.
A. heat convection through the adjacent bulkheads
B. combustion gases carried through the ventilation system
C. direct convection of the heat emitted by the adjacent fire
D. heat radiated from the dock or bulkhead by the adjacent fire
[单项选择]A combustible gas indicator meter is calibrated to read the percentage of（）.
A. vapor to oxygen
B. the flammable limit concentration
C. the autoignition concentration
D. the lower explosive limit concentration
[单项选择]Combustible gas indicators operate by drawing an air sample into the instrument（）.
A. over an electrically heated platinum filament
B. where it is mixed with nitrogen
C. where it is ignited by a sparking device
D. where its specific gravity is measured
[单项选择]A combustible gas indicator is used to determine （）.
A. if there is sufficient oxygen to support life
B. the toxicity of flammable gases or vapors
C. the amount of CO2 present in flue gas
D. the presence of flammable gases or vapors in the air
[单项选择]Fires resulting from spontaneous combustion are usually caused by the improper disposal of（）.
A. cigarette butts
B. oily rags
C. burner torches
D. lighted matches
[单项选择]Fires in escaping flammable gas are quickly brought under control by（）
A. stopping the flow of gas
B. reducing the chemical chain reaction
C. increasing the oxygen supply
D. cooling below the autoignition point
[单项选择]When fighting fires in spaces containing bottles of LPG (liquefied petroleum gas)，you should （）.
A. attempt to isolate the fire from the LPG
B. cool the bottles or remove them from the fire area
C. see that the valves on all LPG bottles are closed
D. place insulating material over the bottles
[单项选择]To avoid scavenge fires occurring the engine timing and equipment maintenance （）.
A. should be correctly carried out
B. should correctly be taken place
C. should carried with care
D. must to carry out with great care
[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]Oil fires are best extinguished by（）.
A. cutting off the supply of oxygen
B. removing the fuel
C. cooling below the ignition temperature
D. spraying with water
[单项选择]Engine room fires have been started by neglected oil leaks dripping on to hot pipes or exhaust manifolds （） insulation has not been replaced after maintenance.
A. which
B. when
C. whose
D. what
[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]Class A fires are best extinguished by quenching or cooling with （）.
A. deprival of oxygen
B. a water spray
C. soda-acid
D. foam
