航海英语液化气体与IGC规则章节练习(2018.01.10)

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
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
单项选择题
A relief valve for a cargo pump is generally installed（）.
A.after the discharge valve
B.between the pump and discharge valve
C.after the suction valve
D.between the pump and suction valve
单项选择题
Before entering a tank，always check the vapor content（）a combustible gas indicator.
A.with
B.by
C.of
D.for
单项选择题
Which is NOT a safety precaution to be observed during the loading of LFG?（）
A.Report any leakage of cargo
B.Make sure the rake ends of the barge are completely dry and mopped
C.Ascertain that the hoses to be used are in good order
D.Be on the lookout for work being accomplished ashore in the vicinity of the barges
单项选择题
The tops of vents from gasoline tanks should terminate（）.
A.in open air
B.inside cabins
C.in machinery space
D.underwater
单项选择题
The airborne concentrations of substances (such as H2S) under which nearly all workers may be repeatedly exposed without adverse effects are called（）.
A.exposure limits
B.concentration limits
C.threshold limit values
D.substance limit values
单项选择题
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
单项选择题
A fire of escaping liquefied flammable gas is best extinguished by（）.
A.cooling the gas below the ignition point
B.cutting off the supply of oxygen
C.stopping the flow of gas
D.interrupting the chain reaction
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