单项选择题

A.The tank must be gas freedB.The tank must be ballaste……

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 freed
B.The tank must be ballasted
C.The tank must be vented to the atmosphere
D.The bypass valve must also be closed

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单项选择题Using an inert gas system on a tanker has which advantage(s)? （）

A.Provides for faster loading
B.Lowers oxygen content in the tank
C.Provides better fuel economy
D.All of the above

单项选择题Upon arrival at the discharging port，the inert gas system is（）.

A.turned on
B.turning on
C.turn on
D.to turn on

单项选择题Unless such oil tanker carries crude oil which is not suitable for crude oil washing，the oil tanker shall（）the system in accordance with the requirements of that Regulation.

A.operate
B.check
C.install
D.overhaul

单项选择题The purpose of the deck seal in an inert gas system is to prevent（）.

A.flammable vapors from entering machinery space
B.flue gas escaping to atmosphere
C.inert gas escaping to atmosphere
D.air entering inert gas system

单项选择题The purpose of inert gas systems aboard tankers is to（）.

A.allow sufficient oxygen in the tank to sustain life
B.prevent outside air from entering the tank
C.provide more discharge pressure
D.comply with pollution regulations