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The brickwork surrounding the firebox of a boiler is known as ______．A.RefractoryB.The screen wallC.The water wallD.Fire plate

题目

The brickwork surrounding the firebox of a boiler is known as ______．

A.Refractory

B.The screen wall

C.The water wall

D.Fire plate

相似考题

1.The correct procedure for giving an auxiliary boiler a bottom blow, is to begin .A.when the boiler has been secured long enough for most solids to settleB.when the boiler has been cooled to ambient temperatureC.only after raising the water level to within 0.5 inch of the high water cutout onlyD.after bypassing the low pressure

2.How to operate boiler?

3.what chemicals did you use to treat the boiler water ?when you test alkalinity and acidity of water in boiler by pH test paper ? the result shows the boiler water is in acidiity . please describe what the possible cause is .

4.The water level in the gauge glass when a boiler is operating is _____ when the boiler is shut down.A.lower thanB.higher thanC.belowD.equal to

参考答案和解析
正确答案：A
更多“The brickwork surrounding the firebox of a boiler is known as ______.A.RefractoryB.The scr ”相关问题

  • 第1题：

    If the feed pump for an auxiliary boiler fails to deliver the feed water to the boiler, the cause may be ______.

    A.high steam pressure in the boiler

    B.abnormally high feed-water temperature

    C.abnormally high boiler water temperature

    D.steam demand exceeding feed pump capacity


    正确答案：B

  • 第2题：

    A firebox explosion in an automatically fired auxiliary boiler may be the result of ______.

    A.excessive purging before lighting off

    B.insufficient trail for ignition period

    C.a faulty transformer in the ignition circuit

    D.insufficient purging before lighting off


    正确答案：D

  • 第3题：

    单选题
    Which of the following statements concerning the water tube and fire tube boilers is not true?（）
    A

    natural circulation of the water in the water tube boiler is better than that in the fire tube boiler

    B

    for the same output the water tube boiler will carry less mass of water compared with the fire tube boiler

    C

    the water tube boiler will cost shorter time for steam raising

    D

    the water tube boiler require lower skill in operating and maintaining


    正确答案： D
    解析： 暂无解析

  • 第4题：

    单选题
    The rate of heat transfer in a water-tube auxiliary boiler can be increased by （）.
    A

    operating the boiler at less than normal water level

    B

    installing fins on the firesides of water-tubes

    C

    increasing the amount of excess air to the burners

    D

    treating the boiler water with chemical oxygen scavengers


    正确答案： B
    解析： 暂无解析

  • 第5题：

    单选题
    When the boiler load returns to normal, the drum pressure will rise and steam bubble formation will reduce, causing a fall in water level This is known as （）.
    A

    swell

    B

    shrinkage

    C

    flash off

    D

    lack of water


    正确答案： B
    解析： 暂无解析

  • 第6题：

    单选题
    The fuel oil supply system to an automatic auxiliary boiler, will automatically shutdown if the boiler （）
    A

    steam demand is high

    B

    salinity is high

    C

    safety valve simmers

    D

    burner flame is extinguished


    正确答案： C
    解析： 暂无解析

  • 第7题：

    单选题
    The moisture equilibrium chart can be used to determine the（）.
    A

    Absolute moisture content of the air surrounding a hygroscopic cargo when moisture equilibrium exists

    B

    Dew point temperature that the air surrounding a hygroscopic commodity will have when in moisture equilibrium with that commodity

    C

    Enthalpy of the air surrounding a hydroscopic cargo which is in moisture equilibrium with the cargo

    D

    Temperature at which moisture equilibrium will occur in a cargo hold containing a hygroscopic cargo


    正确答案： C
    解析： 暂无解析

  • 第8题：

    单选题
    A stream of water immediately surrounding a moving vessel’s hull，flowing in the same direction as the vessel is known as（）.
    A

    directional current

    B

    forward current

    C

    propeller current

    D

    wake current


    正确答案： B
    解析： 暂无解析

  • 第9题：

    单选题
    （） should be tested and adjusted when the boiler survey is carried out.
    A

    The boiler oil tank

    B

    The steam pipe

    C

    The fire side

    D

    The safety valves


    正确答案： D
    解析： 暂无解析

  • 第10题：

    单选题
    When steam is being raised on a boiler, the water level will normally （）.
    A

    drop as the boiler warms up

    B

    rise as the boiler warms up

    C

    remain unchanged until the boiler is hot enough

    D

    rise and fall with the steam demand


    正确答案： B
    解析： 暂无解析

  • 第11题：

    单选题
    If the feed pump for an auxiliary boiler fails to deliver the feed water to the boiler, the cause maybe （）.
    A

    high steam pressure in the boiler

    B

    abnormally high feed water temperature

    C

    abnormally high boiler water temperature

    D

    steam demand exceeding feed pump capacity


    正确答案： C
    解析： 暂无解析

  • 第12题：

    单选题
    The brickwork surrounding the firebox of a boiler is known as（）.
    A

    refractory

    B

    the screen wall

    C

    the water wall

    D

    fire plate


    正确答案： C
    解析： 暂无解析

  • 第13题：

    The boiler water alkalinity in a coil-type auxiliary boiler should be maintained at the pH recommended by the boiler manufacturer to______.

    A.precipitate(使沉淀) silica （硅石）from solution

    B.reduce corrosion in the heating coil

    C.prevent clogging and erosion in the coil

    D.maintain zero water hardness


    正确答案：B

  • 第14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15题：

    单选题
    In the event of a flame failure in an auxiliary water-tube boiler, you must（）
    A

    relight the boiler immediately to prevent loss of steam pressure

    B

    relight the fire off the brickwork as the bricks are cherry red

    C

    purge the furnace of any combustible gases before attempting to relight the fire

    D

    speed up the feed pump to prevent dry firing when the burner flame is reestablished


    正确答案： C
    解析： 暂无解析

  • 第16题：

    单选题
    The correct procedure for giving an auxiliary boiler a bottom blow, is to begin（）
    A

    when the boiler has been secured long enough for most solids to settle

    B

    when the boiler has been cooled to ambient temperature

    C

    only after raising the water level to within 0~5 inch of the high water cutout only

    D

    after bypassing the low pressure


    正确答案： A
    解析： 暂无解析

  • 第17题：

    单选题
    The fuel supply system to an automatic auxiliary boiler, will be automatically shutdown if the boiler （）
    A

    salinity is abnormally high

    B

    steam demand is too high

    C

    water level is abnormally low

    D

    feedwater flow is low


    正确答案： C
    解析： 暂无解析

  • 第18题：

    单选题
    A firebox explosion in an automatically fired auxiliary boiler may be the result of （）
    A

    excessive purging before lighting off

    B

    insufficient trail for ignition period

    C

    a faulty transformer in the ignition circuit

    D

    insufficient purging before lighting off


    正确答案： C
    解析： 暂无解析

  • 第19题：

    单选题
    A （） boiler is an auxiliary boiler sometimes included in a steamships installation for supplying steam to auxiliaries in port.
    A

    monkey

    B

    donkey

    C

    waste heat

    D

    main


    正确答案： D
    解析： 暂无解析

  • 第20题：

    单选题
    The boiler water alkalinity in a coil-type auxiliary boiler should be maintained at the pH recommended by the boiler manufacturer to（）
    A

    precipitate silica from solution

    B

    reduce corrosion in the heating coil

    C

    prevent clogging and erosion in the coil

    D

    maintain zero water hardness


    正确答案： C
    解析： 暂无解析

  • 第21题：

    单选题
    Foaming in the steam drum may be caused by （） in a boiler.
    A

    oxygen in the water

    B

    poor boiler design

    C

    density too high

    D

    excessive steam demand


    正确答案： C
    解析： 暂无解析

  • 第22题：

    单选题
    Excessive alkalinity of the water in an auxiliary boiler can cause （）.
    A

    caustic embrittlement of the boiler metal

    B

    acidic corrosion of the boiler metal

    C

    hard scale deposits on the boiler tubes

    D

    etching of the heat exchange surfaces


    正确答案： A
    解析： 暂无解析

  • 第23题：

    单选题
    Before an auxiliary boiler is shutdown for an extended period of time, the water in the boiler should have a pH value of （）.
    A

    10

    B

    7

    C

    4

    D

    1


    正确答案： D
    解析： 暂无解析

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