prevents the flue gas from falling below 3% content of oxygen
allows the inert gas piping to be used for gas freeing the tanks
opens when there is excessive vacuum on the deck water seal
enables outside air to mix with and cool hot flue gasses
第1题：
Which of the listed functions is the purpose of a gas scrubber in an inert gas generation system ________．
A.Cools the inert gas
B.Maintains the oxygen content at 5% by volume
C.Drains off static electricity in the inert gas
D.Maintains the water seal on the gas main
第2题：
The blowers of an inert gas generation system aboard a tanker，will be automatically secured if ______．
A.Normal water supply at the water seal is lost
B.The temperature of the inert gas being delivered to the cargo tanks is more than 150℉
C.The cooling water supply to the scrubbers is lost
D.All of the above
第3题：
How does an inert gas system on a tanker function to prevent explosions in cargo tanks?
A.De-energizes the "charged mist" effect
B.Maintains a positive pressure on the vent header to cool the flammable vapors
C.Inert gas filters out the flammable vapors from the cargo tank spaces
D.Inert gas dilutes the flammable vapor and air concentrations to keep them below the lower explosive limit
第4题：
What is the major function of the deck water seal in an inert gas system ________．
A.Relieve excessive overpressures in the system
B.Isolate hazardous from nonhazardous areas
C.Prevent the flow of inert gas into closed tanks
D.Remove any leftover water or soot after the gas has been scrubbed
第5题：
The fresh air intake of the inert gas system ______，
A.Prevents the flue gas from falling below 3% content of oxygen
B.Allows the inert gas piping to be used for gas freeing the tanks
C.Opens when there is excessive vacuum on the deck water seal
D.Enables outside air to mix with and cool hot flue gasses
第6题：
After the initial cleaning of flue gas in an inert gas system the gas is passed through what device for final cleaning ________．
A.Scrubber
B.Demister
C.Deck water seal
D.Final filter
第7题：
The deck water seal of the inert gas system ______．
A.Cools the inert gas and prevents soot from entering the cargo tanks
B.Acts as an emergency shutdown when inlet pressures exceed the safe working pressure
C.Prevents the backflow of hydrocarbon gasses into nonhazardous areas
D.Relieves sudden large overpressures in the system
第8题：
Which method is used to supply inert gas from a flue gas system to the cargo tanks?
A.Exhaust gas pressure from the stack
B.High capacity fan
C.Inert gas compressor
D.Natural aspiration
第9题：
What is NOT a function of the scrubber of an inert gas system ________．
A.Cool the inert gas
B.Remove particulate matter like soot
C.Maintain pressure in the tanks
D.Remove chemical impurities
第10题：
The venting system shall be provided with devices to prevent the passage of ______ into the cargo tanks．
A.flame
B.inert gas
C.air
D.oil gas