The purpose of inert gas systems aboard tankers is to（）.

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• An inert gas system is designed to reduce the possibility of tank explosions by（）.

  A . eliminating sparks and fire in the vicinity of cargo tanks B . removing all hydrocarbon gases from the cargo tanks C . blanketing cargo tanks with inert foam D . reducing the oxygen concentration below levels necessary for combustio

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• During loading and discharging operations，in addition to when the cargo tanks have been properly filled，each inert gas system must be capable of maintaining a minimum gas pressure of（）.

  A . 150 millimeters of water pressure B . 125 millimeters of water pressure C . 100 millimeters of water pressure D . 75 millimeters of water pressure

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• Each ship having an inert gas system must have a portable instruments to measure concentrations of hydrocarbon vapor in inert atmospheres and also to measure（）.

  A . nitrogen B . oxygen C . carbon dioxide D . water vapor

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• 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

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• 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

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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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• The purpose of a devil’s claw is to（）.

  A . act as a chain stopper B . prevent the windlass from engaging C . prevent the chain from fouling on deck D . control the wildcat

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• Which of the following teacher＇s instruction could serve the purpose of eliciting ideas?

  A . Shall we move on? B . Read after me, everyone C . What can you see in this picture D . What does the world “quickly” mean?

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• What’s the purpose of the program?

  A . To keep all the members in the group work together． B . To make the people there understand the meaning of work． C . To find a way to solve the generation gap． D . To help people enjoy their work．

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• After the initial cleaning of fule gas in an inert gas system is passed through what devoce for final cleaning?（）.

  A . Scrubber B . Demister C . Deck water seal D . Final filter

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• The deck water seal of the inert gas system（）.

  A . cools the inert gas and prevents soot from entering the cargo tanks B . acts as an emergency shutdown when inlet pressures exceed the safe working pressure C . prevents the backflow of hydrocarbon gasses into nonhazardous areas D . relieves sudden large overpressures in the system

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• SOLAS regulations require that the inert gas system shall be capable of delivering inert gas with an oxygen content of not more than what percentage?（）

  A . 5% B . 8% C . 6% D . 3%

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• The combined fan discharge rate in an inert gas system is related to the（）.

  A . shoreside loading rate B . maximum cargo pump discharge rate C . boiler forced draft fan rate D . size of the largest cargo tank

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• The fresh air intake of the inert gas system（）.

  A . prevents the flue gas from falling below 3% content of oxygen B . allows the inert gas piping to be used for gas freeing the tanks C . opens when there is excessive vacuum on the deck water seal D . enables outside air to mix with and cool hot flue gasse

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• The component in an inert gas system used for cleaning the gas of solid and sulphur combustion products，while simultaneously cooling the inert gas，is called the（）.

  A . filter B . cooler C . scrubber D . purifier

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• After the initial cleaning of flue gas in an inert gas system the gas is passed through what device for final cleaning?（）

  A . Scrubber B . Demister C . Deck water seal D . Final filter

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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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• The purpose of inert gas systems aboard tank vessels is to（）.

  A . allow sufficient oxygen in the tank to sustain life B . prevent outside air from entering the tank C . provide increase in cargo discharge pressure D . comply with double hull pollution prevention regulatio

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• Upon arrival at the discharging port，the inert gas system is（）.

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

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• The blowers of an inert gas generation system aboard a tanker，will be automatically secured if（）.

  A . normal water supply at the water seal is lost B . the temperature of the inert gas being delivered to the cargo tanks is more than 150°F C . the cooling water supply to the scrubbers is lost D . all of the above

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• 2.What’s the main purpose of the BCC field?

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• The 1982 Oil and Gas Act gives power to permit the disposal of assets held by the Corporation, and the Corporation's statutory monopoly in the supply of gas for fuel purposes so as to permit private companies to compete in this supply.

  A．defers B．curtails C．triggers D．sparks

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• What’s the main purpose of the passage？

  A．To inform. people the severity of the millennium bug. B．To accuse some comes for being inactive. C．To advise people to abandon the computers. D．To tell the readers the way to solve the millennium bug problem.

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• What' s the purposes of the team experts to set sail？

  A．Their goal is only to prove the huge wave' s existence. B．They went to study the waves. C．They wanted to ride one as well as to prove its existence. D．They get sail just out of fun.

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