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 solutionB.reduce corrosion in the heating coilC.prevent clogging and erosion in t

题目

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

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.The water in an auxiliary boiler should be tested for chloride content to determine ( ).A.total dissolved solidsB.salt contaminationC.water harcnessD.chlorine contamination

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 fuel supply system to an automatic auxiliary boiler, will be automatically shutdown if the boiler()A.salinity is abnormallyB.high steam demand is tooC.feed-water flow is lowD.water level is abnormally low

参考答案和解析
正确答案：B
更多“The boiler water alkalinity in a coil－type auxiliary boiler should be maintained at the pH ”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：

    单选题
    The water level of an exhaust gas boiler which is independent of the auxiliary boiler and just as the extra heating surface of it （）
    A

    will be modulated in proportion

    B

    will be modulated in proportion and integral

    C

    will be modulated in proportion and differential

    D

    will not be modulated at all


    正确答案： C
    解析： 暂无解析

  • 第3题：

    单选题
    In readying an auxiliary water-tube boiler for a routine hydrostatic test, which of the following procedures should be undertaken prior to filling the boiler with fresh water?（）
    A

    The safety valve escape piping should be disconnected from the valve body and a blank inserted

    B

    The boiler vent valves should be opened

    C

    All hand-hole/manhole covers should be tightened up as much as possible to preclude any leaks

    D

    All of the above


    正确答案： D
    解析： 暂无解析

  • 第4题：

    单选题
    In readying an auxiliary water-tube boiler for a routine hydrostatic test, which of the following procedures should be undertaken prior to filling the boiler with fresh water?（）
    A

    The safety valve escape piping should be disconnected from the valve body and a blank inserted

    B

    The boiler vent valves should be opened

    C

    All handhole/manhole covers should be tightened up as much as possible to preclude any leaks

    D

    All of the above


    正确答案： B
    解析： 暂无解析

  • 第5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6题：

    单选题
    A distorted furnace in a fire-tube auxiliary boiler may be the result of （）
    A

    firing for extended periods in the low fire mode

    B

    overheating, due to waterside deposits

    C

    varying the water level above the crown sheet

    D

    carrying excessive alkalinity in the boiler water


    正确答案： C
    解析： 暂无解析

  • 第7题：

    单选题
    The water in an auxiliary boiler should be chemically tested daily for alkalinity and（）
    A

    soap hardness

    B

    nitrog encontent

    C

    chloride content

    D

    dissolved CO2


    正确答案： B
    解析： 暂无解析

  • 第8题：

    单选题
    The water in an auxiliary boiler should be tested for chloride content to determine （）.
    A

    total dissolved solids

    B

    salt contamination

    C

    water hardness

    D

    chlorine contamination


    正确答案： B
    解析： 暂无解析

  • 第9题：

    单选题
    Bottom blow valves are installed on auxiliary water-tube boilers to （）
    A

    completely drain the boiler in an emergency

    B

    prevent sludge from forming in the drum

    C

    remove floating impurities from the boiler water surface

    D

    remove settled solids from the water drum


    正确答案： B
    解析： 暂无解析

  • 第10题：

    单选题
    Prior to lighting off a cold automatically fired auxiliary boiler, you should （）.
    A

    check and regulate the water level

    B

    close the air cock once fires are lit

    C

    blowdown the gage glass

    D

    crack the steam stop to assure protective steam flow


    正确答案： A
    解析： 暂无解析

  • 第11题：

    单选题
    The water in an operating auxiliary boiler should be tested for alkalinity and chloride content each（）.
    A

    hour

    B

    day

    C

    week

    D

    month


    正确答案： A
    解析： 暂无解析

  • 第12题：

    单选题
    Which action should be taken when an auxiliary boiler in is operation?（）
    A

    Clean all electrical connections

    B

    Lift the relief valves by hand

    C

    Inspect and clean all solenoid valves

    D

    Inspect for oil and water leaks


    正确答案： B
    解析： 暂无解析

  • 第13题：

    单选题
    The most common cause of scale formation in an auxiliary boiler is （）
    A

    concentrations of calcium sulfate in the boiler water

    B

    fuel oil in the feed water

    C

    improper treatment of the feed water with calcium sulfate

    D

    excessive feed water alkalinity


    正确答案： C
    解析： 暂无解析

  • 第14题：

    单选题
    The purpose of the safety relief valves installed on an auxiliary boiler is to （）.
    A

    relieve excess fuel oil pressure during the “off” fire cycle

    B

    admit water to the dry pipe

    C

    throttle the forced draft fan output for proper combustion

    D

    reduce excess steam pressure in the boiler


    正确答案： C
    解析： 暂无解析

  • 第15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16题：

    单选题
    In an auxiliary boiler steam and water system, the highest pressure will be in the （）.
    A

    steam stop valve

    B

    dry pipe

    C

    feedwater system

    D

    generating tubes


    正确答案： B
    解析： 暂无解析

  • 第17题：

    单选题
    Bottom blow valves are installed on auxiliary water-tube boilers to （）
    A

    remove suspended and precipitated solids from the boiler water

    B

    completely drain the boiler in an emergency situation

    C

    prevent hardened scale deposits in the water drum

    D

    remove floating impurities from the oily water surface


    正确答案： B
    解析： 暂无解析

  • 第18题：

    单选题
    The water in an auxiliary boiler should be tested daily for （）.
    A

    dissolved oxygen

    B

    chlorides

    C

    sludge

    D

    dissolved nitrogen


    正确答案： C
    解析： 暂无解析

  • 第19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20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21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22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

  • 第23题：

    单选题
    If an operating auxiliary boiler has a water pH reading of 7, you should （）.
    A

    bottom blow the boiler

    B

    treat the water with caustic soda

    C

    treat the water with chemical scavengers

    D

    reduce the water alkalinity to recommended readings


    正确答案： C
    解析： 暂无解析

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