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

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• An inert gas system on a tanker should be used to（）.

  A . prevent the generation of flammable or combustible gas in tanks B . blow out cargo lines to prevent the build up of gas concentrations C . dilute tank atmospheres to keep gas concentrations below the lower explosive limit D . prevent fires in the pumproom by continually displacing flammable vapor

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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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• An exhaust gas bypass is installed on a waste heat boiler in order to （）.

  A . bypass exhaust gas at high loads to prevent excessive back pressure B . bypass a portion of the exhaust gas at peak loads for better efficiency C . recycle exhaust gas to the turbocharger D . minimize moisture condensation in the boiler gas passages at low load

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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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• A combination combustible gas and oxygen indicator is an instrument that measures the（） of both combustible gas and oxygen; each is indicated on a separate meter.

  A . purifies B . combinations C . concentrations D . filter

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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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• An uncontrolled flow of gas，oil，or other well fluids into the atmosphere is called a（）.

  A . Flow B . Breakout C . Kick D . Blowout

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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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• 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 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 regulatio

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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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• Gas exchange, which is a basic part of the cycle of an internal combustion engine, is（）

  A . the supply of normal air and removal of compressed air B . the supply of fuel oil and combustion of the atomized oil C . the supply of fresh air and removal of exhaust gases D . the supply of fresh air and removal of the extra heat

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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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