更多"Gas masks（）."的相关试题:
[单项选择]Gas masks（）.
A. should be worn while fighting a fire
B. can be used in atmosphere deficient in oxygen
C. filter contaminants from air that is to be breathed
D. may be substituted for a self-contained breathing apparatus
[单项选择]Each inert gas system gas main must have an automatic shut down valve at the outlet of the gas production plant. This valve must close automatically upon（）.
A. cargo pump failure
B. blower failure
C. deck seal low water level
D. low inert gas temperature
[单项选择]Hot gas defrosting uses the hot gas from （） to defrost the evaporator.
A. starting air bottles
B. diesel engines
C. boilers
D. refrigeration compressors
[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]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 marine chemist issues gas free certificates and is certified by which organization? （）
A. Mine Safety Appliance Association
B. American Chemical Society
C. Marine Chemists Association
D. National Fire Protection Association
[单项选择]The refrigerant gas returning to the compressor should be （）.
A. superheated
B. saturated
C. dense
D. flooded
[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]After passing through the turbine the exhaust gas is conducted out into the（）.
A. intercooler
B. compressor
C. cylinder
D. open air
[单项选择]SOLAS regulations require that the inert gas system shall be capable of delivering inert gas with an oxygen content of not more than what percentage?（）
A. 5%
B. 8%
C. 6%
D. 3%
[单项选择]Diesel engine exhaust gas temperatures can be used to determine individual cylinder （）.
A. performance
B. horsepower output
C. fuel consumption
D. scavenge effect
[单项选择]The primary hazard of liquefied petroleum gas and liquefied natural gas is（）.
A. pressure
B. toxicity
C. temperature
D. flammability
[单项选择]Name one major advantage of transporting gas under refrigeration.（）
A. It increases its volume
B. It reduces its volume
C. It has less product per volume
D. None of the above
[单项选择]Exhaust gas pyrometers are useful for（）
A. detecting faulty combustion in individual cylinders
B. adjusting fuel racks to maintain equal loading between cylinders
C. adjusting the load limit setting of the governor at idle conditions
D. calculating engine horsepower
