You are testing a tank that contained gasoline by using a combustible gas indicator．Under testing，the tank sample caused the needle to move rapidly to 100 on the dial then fall to zero．What is the concentration of flammable gas ________．
A.Less than the flammable range
B.Within the flammable range
C.Over the flammable range
D.The explosimeter is defective and giving a false reading
第1题：
You are discharging cargo and the inert gas system is in operation to inert the tanks. The pressure in a tank being discharged starts to drop below the allowable limit. What action should you take?
A.Cut in another IG fan to increase gas flow
B.Open the pressure control valve until the pressure increases
C.Open the tank isolation valve to the fully open position
D.Reduce the pumping rate
第2题：
While testing a cargo tank，your oxygen indicator reads 25% oxygen in the tank. You would then ______.
A.enter the tank safely
B.suspect the accuracy of the reading
C.ventilate the tank
D.test for nitrogen
第3题：
Before entering a fuel tank that has been cleaned, it should be checked with an oxygen indicator and a/an ____.
A.Orsat apparatus
B.flame safety lamp
C.Halide torch
D.combustible gas indicator
第4题：
Gasoline fuel tank vents should terminate ______．
A.In the engine compartment
B.In the fuel tank space
C.Above or outside the hull
D.At the most convenient location
第5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
第6题：
What is the best instrument for establishing a safe working area before welding in a confined space?
A.An oxygen indicator
B.A combustible gas indicator
C.A combination combustible gas and oxygen indicator
D.A flame safety lamp
第7题：
Before starting a gasoline engine on a motorboat，you should make sure for safety that ______．
A.The gasoline tank is full
B.The bilges，cabins，etc．are thoroughly ventilated
C.You have fresh water on board
D.Each of the above is followed
第8题：
An inert gas system on a tanker should be used to ______.
A.prevent the generation of flammable or combustible gas in tanks
B.blow out cargo lines to prevent the build up of gas concentrations
C.dilute tank atmospheres to keep gas concentrations below the lower explosive limit
D.prevent fires in the pumproom by continually displacing flammable vapors
第9题：
You are in a tank wearing the self-contained breathing apparatus and you desire to return topside．How many tugs of the lifeline mean to take up the slack ________．
A.One
B.Two
C.Three
D.Four
第10题：
Inerting means ______．
A.The introduction of inert gas into a tank with the object of reducing the oxygen content to below 8% by volume
B.The introduction of inert gas into a gas free tank for the purpose of reducing the oxygen content to below 8% by volume
C.The introduction of inert gas into a cargo tank during cargo discharge to replace the volume of discharged cargo
D.All of the above