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单选题
What is used to test a tank for oxygen content?（）
A
Combustible gas indicator
B
Vapor indicator
C
Atmosphere analyzer kit
D
None of the above
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What is used to view status messages sent to a file named "test" as they are sent?()
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When measuring the oxygen content of the cargo tanks prior to loading cargoes requiring vapor recovery，check it ______.A.one meter from the tank bottom and one meter below the tank topB.one half the ullage of the tank and one meter below the tank topC.one half the ullage of the tank and one meter above the tank bottomD.at three meter intervals from the tank top to the bottom
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Why is gas-freeing rarely required for LPG cargo tanks?A.LPG is compatible with all cargosB.LPG's high oxygen content makes it nonvolatileC.Cargo tanks are inspected less frequently than on oil tankersD.The cargo tanks are used for one type of cargo only
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While testing a cargo tank，your oxygen indicator reads 25% oxygen in the tank. You would then ______.A.enter the tank safelyB.suspect the accuracy of the readingC.ventilate the tankD.test for nitrogen
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Which statement about entry into a space that has been sealed for a long time is TRUE ________．A.A tank that has been used to carry hazardous liquids should be tested for oxygen content，toxicity，and explosive gasesB.You can safely enter the space without a breathing apparatus if the oxygen content exceeds 14%C.The natural ventilation through the installed vents is sufficient to provide the proper oxygen contentD.The heat of the sun on upper ballast tanks，such as in a bulk carrier，may generate carbon monoxide
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What is used to test a tank for oxygen content ________．A.Combustible gas indicatorB.Vapor indicatorC.Atmosphere analyzer kitD.None of the above
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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
考题
Inerting means ______．A.The introduction of inert gas into a tank with the object of reducing the oxygen content to below 8% by volumeB.The introduction of inert gas into a gas free tank for the purpose of reducing the oxygen content to below 8% by volumeC.The introduction of inert gas into a cargo tank during cargo discharge to replace the volume of discharged cargoD.All of the above
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What best describes for how long a gas-free test is good ________．A.For as long as is indicated on the gas-free certificateB.For the instant that it is madeC.Until valves in line with the tank or compartment are reopenedD.Until changes in temperature or pressure affect the vapor content in the space
考题
What is NOT a requirement for the safe and effective use of a crude oil washing system ________．A.Strip all tanks and remove the bottom residueB.Use an inert gas system while washing tanksC.Use portable washing machines to reach areas obscured by structural members in the tanksD.Debottom the tank used as the source for the tank cleaning machines
考题
You are planning to use a crude oil washing system．What precaution must be taken with the tank as the source for the washing machines ________．A.It must be debottomed and the level lowered by at least one meterB.The oil in the source tank must be sampled for compatibilityC.The source tank must have been crude oil washed at least once in the past 150 daysD.The inert gas system must lower the oxygen content to a maximum of 12% oxygen in the tank
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You are planning to use the crude oil washing system on your tanker．What is required to prevent electrostatic buildup in the tanks ________．A.The portable machines should be set at the proper drop for the first wash before the fixed machines are usedB.The tank used as the source for the tank cleaning machines should be debottomed for at least one meterC.The inert gas system must reduce the oxygen content in the tank to at least 18%D.The fixed machines must be operated simultaneously with the portable machines to equalize the electrostatic potential
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What is a cofferdam ________．A.Tube fitted to an ullage holeB.Area the product is loaded intoC.Void or empty space separating two tanksD.Opening in the deck used for cleaning a tank
考题
Deficient oxygen content inside a chain locker can be detected with ______.A.litmus paperB.a combustible gas indicatorC.an oxygen breathing apparatusD.an oxygen indicator
考题
单选题When measuring the oxygen content of the cargo tanks prior to loading cargoes requiring vapor recovery，check it（）.A
one meter from the tank bottom and one meter below the tank topB
one half the ullage of the tank and one meter below the tank topC
one half the ullage of the tank and one meter above the tank bottomD
at three meter intervals from the tank top to the bottom
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单选题What is head tank in the closed cooling water system used for?（）A
for the release of air from the cooling waterB
providing expansion room for heated cooling waterC
a place for implementing water and water treatment agentD
all of the above
考题
单选题Why is gas-freeing rarely required for LPG cargo tanks? （）A
LPG is compatible with all cargosB
LPG's high oxygen content makes it nonvolatileC
Cargo tanks are inspected less frequently than on oil tankersD
The cargo tanks are used for one type of cargo only
考题
单选题When checking the oxygen content of the cargo tanks prior to loading cargoes requiring vapor recovery，the atmosphere must be sampled（）.A
one meter from the tank bottom and one meter below the tank topB
one half the ullage of the tank and one meter below the tank topC
one half the ullage of the tank and one meter above the tank bottomD
at three meter intervals from the tank top
考题
单选题A tank which has been sealed for a long period of time can be dangerous because （）.A
steel surfaces consume oxygen by rustingB
sealed tanks usually form a vacuumC
moisture condenses in the tank, displacing the oxygenD
most tank coatings give off poisonous vapors in the presence of moisture
考题
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
at the top of the tankC
in the vent riserD
one meter from the deck
考题
单选题Deficient oxygen content inside a chain locker can be detected with（）.A
litmus paperB
a combustible gas indicatorC
an oxygen breathing apparatusD
an oxygen indicator
考题
单选题What is a cofferdam（）.A
Tube fitted to an ullage holeB
Area the product is loaded intoC
Void or empty space separating two tanksD
Opening in the deck used for cleaning a tank
考题
单选题What is used to view status messages sent to a file named "test" as they are sent?（）A
monitor start testB
show log testC
view log testD
show test realtime
考题
单选题Inerting means（）.A
the introduction of inert gas into a tank with the object of reducing the oxygen content to below 8% by volumeB
the introduction of inert gas into a gas free tank for the purpose of reducing the oxygen content to below 8% by volumeC
the introduction of inert gas into a cargo tank during cargo discharge to replace the volume of discharged cargoD
All of the above
考题
单选题What can be used to measure the percentage of oxygen inside a chain locker?（）A
Flame safety lampB
Combustible gas indicatorC
Oxygen indicatorD
H2S meter
考题
单选题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%
考题
单选题While testing a cargo tank，your oxygen indicator reads 25% oxygen in the tank. You would then （）.A
enter the tank safelyB
suspect the accuracy of the readingC
ventilate the tankD
test for nitrogen
考题
单选题What is used to test a tank for oxygen content?（）A
Combustible gas indicatorB
Vapor indicatorC
Atmosphere analyzer kitD
None of the above
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