Is oxygen the only gas ( ) helps fire burn?

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• On a hydrocarbon flammability chart the line which extends from 0% to 21.8% oxygen，lying tangent to the flammability range，is called the（）.

  A . minimum oxygen content line B . critical displacement line C . critical dilution line D . upper threshold limit

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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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• Carbon dioxide flooding system is used for extinguishing fires because it reduces the concentration of oxygen in the air to（）.

  A . flashing point B . combustion point C . auto-ignition point D . lower explosive limit

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• After passing through the turbine the exhaust gas is conducted out into the（）.

  A . intercooler B . compressor C . cylinder D . open air

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• The film of oil between the rings and the liner is not only essential for the lubrication but also （） achieving a gas seal.

  A . play a great part on B . run a role in C . plays an important part in D . acts as important part at

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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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• Besides heat, fuel, and oxygen, which of the following is necessary for a fire to exist?（）

  A . Chain reaction B . Thermal action C . Chemical occlusion D . Pyrotechnical reactio

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• The temperature of a refrigerant gas is the highest （）.

  A . at the compressor discharge B . at the compressor suction C . in the expansion valve D . in the receiver

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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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• Hot gas bypass is one of the methods used to （）

  A . relieve excessive compressor head pressure B . produce flash gas at the expansion valve C . reduce flooding of the receiver at low load D . defrost the evaporator coil

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• The primary hazard of liquefied petroleum gas and liquefied natural gas is（）.

  A . pressure B . toxicity C . temperature D . flammability

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• What is required in addition to the heat，fuel，and oxygen of the fire triangle to have a fire?（）

  A . Electricity B . Chain reaction C . Pressure D . Smoke

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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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• 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 only vein in the body that carries oxygenated blood is ____.

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• The two elements ,______water is made up are the gases oxygen and hydrogen.

  A．that B．which C．of which D．with which

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• The two elements______water is made are oxygen and hydrogen.

  A．that B．which C．of which D．with which

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• It is said that the gas company will raise the gas fare _____ 4%.

  A、by B、for C、 from D、 to

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• Is oxygen the only gas______helps fire burn？

  A．that B．/ C．which D．it

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• RM是每千摩气体的气体常数，对于各种气体有一个共同的数值，又称通用气体常数。RM is the gas constant per thousand moles, and there is a common value for each gas, also known as the universal gas constant.

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• 天然气的主要输送方式The main transportation mode of natural gas：管 道（陆上唯一经济方式) Pipeline （the only economic way on land).

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