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单选题
Before welding in a tank that has carried petroleum products，the tank must be certified by （）.
A
the Coast Guard
B
the ABS
C
the shipyard fire department
D
a certified marine chemist
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Before welding in a tank that has carried petroleum products，the tank must be certified by ______.A.the Coast GuardB.the ABSC.the shipyard fire departmentD.a certified marine chemist
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Which statement about entering into a tank which has been sealed for a long time is TRUE ________．A.The tank should be tested only once to ensure the oxygen content is at least 14% before entryB.The tank must be tested at frequent intervals to ensure that hazardous gasses have not regeneratedC.The tank need not be tested for oxygen content if it is ventilated for more than 24 hoursD.If the oxygen content tests at less than 12% you should wear an approved gas mask
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What refers to the depth of a petroleum product in a tank ________．A.InnageB.OutageC.ThievageD.Ullage
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When a non-volatile cargo is carried in a tank that has not been previously gas freed，then that tank shall ______．A.be purged with hydrocarbon gas prior to loadingB.be gas-freed after loading operationsC.not be maintained in an inert conditionD.be maintained in an inert condition
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单选题Petroleum cargo tanks should not be topped off at deck level when loading on a cold day because（）.A
a subsequent temperature rise will cause the cargo to overflowB
air pockets may cause the cargo to bubble out of the ullage holeC
the increased viscosity of the product requires higher loading pressure which increases the chances of a spillD
the tank valve may be stiff and a spill will occur before the valve can be closed
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单选题The designations A，B，C，D and E grades of cargo refer to the（）.A
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单选题Sometimes it is desirable to connect a member both by riveting and welding. Which statement is TRUE concerning this procedure? （）A
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单选题You are cleaning the tanks after carrying a cargo of crude oil. Which statement is TRUE? （）A
Washing water should be recirculated if possible because it has the same electric potential as the cargo tank being cleanedB
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单选题You are carrying triethylamine，methyl methacrylate and isoprene in your multiple-product tanker. Which of the following statements is true? （）A
Isoprene may be carried in a cargo tank adjacent to either of the other two cargoesB
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单选题Before welding is permitted on a fuel tank, it must be certified or declared （）A
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单选题Before a tank is to be crude oil washed，the oxygen content in the tank must be measured at a position（）.A
immediately above the level of the oilB
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单选题In order to reduce the accumulation of static electricity while loading petroleum products, you should（）.A
start to load at maximum pressureB
start to load slowlyC
increase the air flow into the tankD
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单选题If emergency welding repairs must be made to the upper area of a fuel tank, the tank and/or adjacent compartments may need to be （）A
gas freedB
inertedC
filled with waterD
all of the above as necessary
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单选题Which step is NOT generally taken when gas-freeing a tank?（）.A
Washing the tank interior with sea waterB
Application of degreasing solventsC
Removal of corrosion products and sludgeD
Fresh air ventilation
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单选题Before entering a fuel tank that has been cleaned, it should be checked with an oxygen indicator and a/an（）.A
Orsat apparatusB
flame safety lampC
Halide torchD
combustible gas indicator
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单选题A tank has been sealed and unventilated for a long period of timeWhich of the following conditions does this indicate?（）A
The tank is safe to enterB
The tank is especially dangerous to enterC
Carbon monoxide is presentD
Water vapor present when the tank was sealed has oxidized
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