Petroleum cargo tanks should not be topped off at deck level when loading on a cold day because（）.

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• 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 nitroge

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• In setting the valves on a steam-smothering system on a tank vessel，the master control valve to cargo tanks should be（）.

  A . open and individual tank valves open B . open and the individual tank valves closed C . closed and the individual tank valves closed D . closed and the individual tank valves ope

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• Before welding can be done in a tank that has carried petroleum products，a certificate must be obtained from（）.

  A . the Customs B . the Register Bureau of Shipping C . the Shipyard Fire Department D . a certified gas chemist

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• Access to a cargo pumproom on a tank vessel carrying grades A，B，C or D liquid cargoes shall be（）.

  A . at least 13.1 feet away from the galleys，living quarters or navigation spaces B . from the open deck C . only from areas equipped with power ventilation systems D . isolated from any part of the vessel which normally contains sources of vapor ignitio

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• Regulations require that cargo tanks carrying grades D or E liquids on tank barges be vented with（）.

  A . gooseneck vents and flame screens B . pressure-vacuum relief valves C . branch vent lines and a vent header D . forced draft blower

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• Which method is used to supply inert gas from a flue gas system to the cargo tanks?（）

  A . Exhaust gas pressure from the stack B . High capacity fan C . Inert gas compressor D . Natural aspiratio

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• Air compressors are NOT permitted in which space(s) on a tank barge carrying grade A cargo?（）

  A . A cargo handling room B . A space in which cargo hose is stored C . An enclosed space containing cargo piping D . All of the above

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• The FIRST course of action in fighting a fire in a cargo or fuel oil tank is to （）.

  A . secure all openings to the tank B . discharge an initial charge of CO with a hand portable extinguisher C . direct a fire hose into the tank and energize the fire main D . spray the tank boundaries with a fire hose to promote cooling

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• Sufficient cargo tanks shall be（）prior to each ballast voyage in order that，taking into account the tanker’s trading pattern and expected weather conditions，ballast water is put only into cargo tanks which have been crude oil washed.

  A . inerted B . crude oil washed C . gas freed D . batterned dow

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• The sign used to caution persons approaching the gangway of a tank barge during cargo transfer reads（）.

  A . Warning，Keep Off，Stay Clear B . Danger，Do Not Board C . Warning，No Smoking，No Open Lights，No Visitors D . Dangerous Cargo Being Transferred

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• Which 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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• A bonding cable should be connected for cargo operations aboards a tank vessel as soon as the（）.

  A . cargo has been loaded or discharged B . cargo ghose is connected C . cargo pumps are started D . vessel is ready to handle cargo

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• Before welding in a tank that has carried petroleum products，the tank must be certified by （）.

  A . the Coast Guard B . the ABS C . the shipyard fire department D . a certified marine chemist

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• Why is gas-freeing rarely required for LPG cargo tanks? （）

  A . LPG is compatible with all cargos B . LPG's high oxygen content makes it nonvolatile C . Cargo tanks are inspected less frequently than on oil tankers D . The cargo tanks are used for one type of cargo only

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• How should cargo tank hatches be protected when the ullage opening is open and the tank NOT gas free?（）.

  A . With gooseneck vents B . With warning signs C . With flame screens D . With pressure-vacuum relief valve

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• The system of valves and cargo lines in the bottom piping network of a tank vessel that connects one section of cargo tanks to another section is called a（）.

  A . crossover B . runaround C . come-along D . manifold

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• How should cargo tank hatches be protected when the ullage opening is open and the tank not gas free?（）.

  A . With gooseneck vents B . With warning signs C . With flame screens D . With pressure-vacuum relife valve

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• By regulation，cargo tank atmosphere must be inert before and during which operation?（）

  A . Stripping B . Loading C . Cleaning D . All of the above

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• By regulation，cargo tanks must be inert before and during what operation?（）.

  A . Stripping B . Loading C . Cleaning D . Crude oil washing

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• According to the regulations，to prevent excessive pressure buildup in cargo tanks containing LFG，they are fitted with（）.

  A . pressure vacuum relief valves B . excess flow valves C . safety relief valves D . flame scree

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• （）is not an advice be observed when samples are taken in tanks containing volatile petroleum products.

  A . Filter masks with a combination filter should be brought and used whenever necessary B . Only explosion-proof equipment（marked EEx）should be used C . Avoid breathing petroleum gases，especially if they come from sour crude（smell of rotten eggs） D . so far as possible，take early and substantial action to keep well clear

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• The system of valves and cargo lines in the bottom piping network of a tanker that connects one section of cargo tanks to another section is called a（）.

  A . come-along B . crossover C . manifold D . runaround

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• When checking the oxygen content of the cargo tanks prior to loading cargoes requiring vapor recovery，the atmosphere must be sampled（）.

  A . one meter from the tank bottom and one meter below the tank top B . one half the ullage of the tank and one meter below the tank top C . one half the ullage of the tank and one meter above the tank bottom D . at three meter intervals from the tank to

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