Name one major advantage of transporti...

单项选择题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

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1.单项选择题LFG tank and pipeline maintenance should include（）.

A.exclusion of all sand and solid matter
B.cleaning with clean fresh or sea water
C.examination for fractures and pitting
D.All of the above

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2.单项选择题It should be noted（）the use of synthetic mooring ropes able to produce sparks by their manipulation is absolutely forbidden on board petroleum tankers and LPG or LNG carriers，or any vessels carrying inflammable substances.

A.that
B.which
C.who
D.these

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3.单项选择题If you have a liquefied flammable gas barge in tow，which is NOT required of you with respect to the barge and its cargo? （）

A.Make periodic inspections of bilges
B.Keep the barge under constant surveillance
C.Have a properly certificated tankerman or at least one licensed officer on board the towing vessel
D.Verify ullage readings

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4.单项选择题Gasoline vapor tends to collect（）.

A.above the floor plates of the bilges
B.above the carburetor level
C.at the lowest point of the bilge areas
D.at no particular level

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5.单项选择题Gasoline tanks should be filled（）.

A.to the top to expel all vapors from the tanks
B.to the top so the operator is certain how much fuel he has aboard
C.with only sufficient fuel for the planned trip so excess gasoline is not carried
D.to near the top with some space allowed for gasoline expansion

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6.单项选择题Gasoline fumes tend to（）.

A.settle near the bottom of the bilge
B.settle near the top of the bilge
C.settle evenly throughout all levels of the bilge by mixing with air
D.disperse to atmosphere

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7.单项选择题Each ship having an inert gas system must have a portable instruments to measure concentrations of hydrocarbon vapor in inert atmospheres and also to measure（）.

A.nitrogen
B.oxygen
C.carbon dioxide
D.water vapor

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8.单项选择题Each inert gas system must be designed to supply the cargo tanks with a gas，or mixture of gasses，that has an oxygen content by volume of（）.

A.5% or less
B.10% or less
C.15% or less
D.20% or less

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9.单项选择题Compared to the amount of concentrated foam liquid used，the amount of low expansion mechanical foam produced is（）.

A.97 times greater
B.94 times greater
C.10 times greater
D.2 times greater

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10.单项选择题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

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