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单选题
Before welding is permitted on a fuel tank, it must be certified or declared （）
A
safe for becoming rounded
B
safe for hot work
C
not safe for personnel
D
not safe for hot work
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单选题If the overflow tank high-level alarm sounds while the fuel oil tanks are being topped off, the engineer should （）.A
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考题
单选题Before welding is permitted on a fuel tank, it must be certified or declared （）A
safe for becoming roundedB
safe for hot workC
not safe for personnelD
not safe for hot work
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The fuel from the bunker tanks must be treated by before entering the service tanks（）, from where the fuel enters（）A
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考题
单选题By regulation，cargo tank atmosphere must be inert before and during which operation?（）A
StrippingB
LoadingC
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考题
单选题What action must be taken when an individual cargo tank is closed off from the inert gas system by the tank isolation valve?（）A
The tank must be gas freedB
The tank must be ballastedC
The tank must be vented to the atmosphereD
The bypass valve must also be closed
考题
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
考题
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
考题
单选题Following a grounding, you can best determine that a SLACK fuel oil tank has been holed by （）.A
sounding the tankB
waiting for the vessel to listC
examining tank boundariesD
checking fuel oil strainers
考题
单选题Gasoline fuel tank vents should terminate（）.A
in the engine compartmentB
in the fuel tank spaceC
above or outside the hullD
at the most convenient location
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