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

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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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• 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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• The sequence of parts in a generally used fuel oil supply system for a main engine is （） (1)tanks in the double bottom (2)centrifuges (3)service tank (4)settling tank (5)viscosity regulator

  A . (1)-(2)-(4)-(3)-(5) B . (1)-(4)-(2)-(3)-(5) C . (1)-(3)-(2)-(4)-(5) D . (1)-(5)-(4)-(2)-(3)

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• According to the regulations，normally，manholes in LFG tanks are located（）.

  A . in the ends of each tank B . in the expansion trunk of each tank C . above the weather deck D . there are no requirements in the regulatio

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• By regulation，your cargo vessel must have（）.

  A . sufficient facilities for the crew to wash their clothes B . a wash basin in each room C . separate toilet facilities for engineers where their number exceeds six D . All of the above

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• Regulations concerning the stowage，lashing，and securing of timber deck cargoes aboard general cargo vessels may be found in the（）.

  A . International Cargo Bureau Regulations B . Load Line Regulations C . Rules and Regulations for Cargo and Miscellaneous Vessels D . Vessel's classification society rules and regulatio

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• You have berthed in a area with other tank vessels. What signal is displayed by a vessel to indicate it is transferring flammable or combustible liquid cargo?（）.

  A . A flashing yellow light B . A red light visible all around the horizon C . A green light visible all around the horizon D . An illuminated red and yellow caution flag

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• Prior to burning or welding on a fuel tank on a ship，regulations require that an inspection be made. An entry in the unofficial logbook is required if this inspection is made by（）.

  A . a marine chemist B . the Officer in Charge，Marine Inspection C . the Master or person in charge of the ship D . the National Fire Protection Associatio

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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 fire and boat drill on a tank vessel shall, by regulation, include （）.

  A . starting the fire pumps B . checking firemans outfits and other personnel rescue equipment C . checking relevant communications equipment D . All of the above

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• On a vessel carrying grades A，B，C or D cargoes，enclosed spaces where sources of vapor ignition are normally present shall NOT be segregated from cargo tanks by（）.

  A . cofferdams B . galleys C . pump rooms D . tanks used to carry liquids having a flash point of 150°F or above

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• A SYSTEM OF CLEANING THE TANKS BY WASHING THEM WITH THE CARGO OF CRUDE OIL WHILE IT IS BEING DISCHARGED is known as（）.

  A . COW B . LOT C . CBT D . coferdam

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• Regulations require that access to a cargo pumproom in a tanker carrying grade D liquid cargo，shall be（）.

  A . away from galleys，living quarters，or navigation spaces B . only from areas equipped with power ventilation systems C . from the open deck D . isolated from sources of vapor ignitio

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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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• Regulations require that tank vessels handling grade B liquids shall have their cargo pumps separated from all sources of vapor ignition by（）.

  A . cofferdams B . empty cargo spaces C . gas tight bulkheads D . areas equipped with power ventilatio

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• Regulations require that cargo pumprooms on tank barges (constructed in 1965) carrying grades B or C liquid cargoes have power ventilation systems which can completely change the air in （）.

  A . 1 minute B . 3 minutes C . 5 minutes D . 10 minute

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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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• 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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• 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 le

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• Regulations require that cargo pumps in tankers carrying grade D liquid cargo shall be isolated from sources of vapor ignition by ______．

  A.Cofferdams B.Gastight bulkheads C.Passageways or living quarters D.General cargo spaces

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