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Which statement is TRUE concerning combustible gas indicators ________．A.One sample of air is adequate to test a tankB.They do not work properly where there is a lack of oxygenC.They will detect a lack of oxygenD.They are calibrated to read the percentage

题目

Which statement is TRUE concerning combustible gas indicators ________．

A.One sample of air is adequate to test a tank

B.They do not work properly where there is a lack of oxygen

C.They will detect a lack of oxygen

D.They are calibrated to read the percentage chance of explosion

相似考题

1.Concerning baby-sitting and managing a paper route, which of the following statement is true?A． Both call for daily service.B． Both call for a sense of responsibility.C． Neither is affected by bad weather.D． Neither is helpful to character development.

2.Combustible gas indicators operate by drawing an air sample into the instrument ______．A.Over an electrically heated platinum filamentB.Where it is mixed with nitrogenC.Where it is ignited by a sparking deviceD.Where its specific gravity is measured

3.You are testing a tank that contained gasoline by using a combustible gas indicator．Under testing，the tank sample caused the needle to move rapidly to 100 on the dial then fall to zero．What is the concentration of flammable gas ________．A.Less than the flammable rangeB.Within the flammable rangeC.Over the flammable rangeD.The explosimeter is defective and giving a false reading

4.Which statement is TRUE concerning the flash point of a substance ________．A.It is lower than the ignition temperatureB.It is the temperature at which a substance will spontaneously igniteC.It is the temperature at which a substance，when ignited，will continue to burnD.It is the temperature at which the released vapors will fall within the explosive range

参考答案和解析
正确答案：B
更多“Which statement is TRUE concerning combustible gas indicators ________.A.One sample of air ”相关问题

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    Which statement is TRUE concerning the placard entitled Discharge of Oil Prohibited ________．

    A.It is required on all vessels

    B.It may be located in a conspicuous place in the wheelhouse

    C.It may be located at the bilge and ballast pump control station

    D.All of the above


    正确答案：C

  • 第2题：

    Which statement about the inert gas system is TRUE ________．

    A.Boiler soot blowers should never be used when the IG system is operating

    B.The boiler will produce the best quality of flue gas for the IG system when the boiler load is very light

    C.The boiler will produce the most quantity of flue gas for the IG system when the boiler load is very light

    D.Flue gas with excessive oxygen content is de-oxygenated in the scrubber


    正确答案：A

  • 第3题：

    Which statement concerning GPS is TRUE ________．

    A.It cannot be used in all parts of the world

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    C.It may be suspended without warning

    D.Two position lines are used to give a 2D fix


    正确答案：C

  • 第4题：


    Which of the following concerning natural gas is NOT true？( )

    A.It was not favored in the past.
    B.It is easily affected by the change of the climate.
    C.People are beginning to realize its value.
    D.It is increasingly cheaper to be liquefied.

    答案：B
    解析：

  • 第5题：

    单选题
    A combustible gas indicator is used to determine （）.
    A

    if there is sufficient oxygen to support life

    B

    the toxicity of flammable gases or vapors

    C

    the amount of CO2 present in flue gas

    D

    the presence of flammable gases or vapors in the air


    正确答案： D
    解析： 暂无解析

  • 第6题：

    单选题
    Which statement is TRUE concerning the gooseneck（）.
    A

    It is a sailing maneuver which brings the vessel's head through the wind

    B

    It connects the boom to the mast and allows the boom to swing freely

    C

    It is a sailing condition where there is a loss of air flow over the sails

    D

    None of the above


    正确答案： A
    解析： 暂无解析

  • 第7题：

    单选题
    Which statement concerning teams is true?
    A

    Nowadays teamwork is a popular concept.

    B

    All the companies put great emphasis on teams.

    C

    A good team involves close supervision of the team leader.

    D

    There’s nothing in common between a team and a group.


    正确答案： B
    解析：
    根据本文的第一句话“Teams are all the rage in the workplace today, and every organization speaks of the importance of teams.”，可以判断选项A与本句的意思相符合，此句中的固定短语all the rage的意思是“非常流行，风靡一时”，所以本题答案为A。

  • 第8题：

    单选题
    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

    filters


    正确答案： C
    解析： 暂无解析

  • 第9题：

    单选题
    Combustible gas indicators operate by drawing an air sample into the instrument（）.
    A

    over an electrically heated platinum filament

    B

    where it is mixed with nitrogen

    C

    where it is ignited by a sparking device

    D

    where its specific gravity is measured


    正确答案： D
    解析： 暂无解析

  • 第10题：

    单选题
    Which statement is TRUE concerning gasoline vapors on board a vessel（）.
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    They are heavier than air and will settle in the lowest part of the vessel

    B

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    C

    They should be vented into the engine to improve combustion

    D

    They should be vented into the wheelhouse


    正确答案： A
    解析： 暂无解析

  • 第11题：

    单选题
    Which of the following best expresses the purpose of this passage?
    A

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    B

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    单选题
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    It cannot be used in all parts of the world

    B

    There are 12 functioning GPS satellites at present

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    Cargo handlers must be outfitted with adequate protection from personal injury

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    D

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    A flammable gas detection system must be installed in each cargo pump room

    B

    Tanks may not be located on deck

    C

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    D

    Aluminum and copper alloys are prohibited from being in valve parts in contact with the cargo


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    解析： 暂无解析

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    单选题
    Combustible gas indicators measure the presence of combustible gas as a percentage of the（）.
    A

    flash point

    B

    upper explosive limit

    C

    lower explosive limit

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    fire point


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    解析： 暂无解析

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    There is an emergency light if the main light is extinguished

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