niusouti.com

In a ______boiler the hot gases from the furnace pass through the tubes while the water is on the outside.A.water-tubeB.fire-tubeC.exhaust gasD.Composite

题目

In a ______boiler the hot gases from the furnace pass through the tubes while the water is on the outside.

A.water-tube

B.fire-tube

C.exhaust gas

D.Composite

相似考题

1.In a()boiler the hot gases from the furnace pass gases from the furnace pass water is on the outside.A.water-tubeB.fire-tubeC.exhaust gasD.composite

2.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 the coilD.maintain zero water hardness

3.单选题If a large difference exists between the compressor discharge pressure and the pressure corresponding to the existing condensing temperature in a refrigeration system, you should（）.A increase the flow of the cooling water through the condenserB adjust the high pressure cutout to maintain the desired pressureC open the hot gas bypass temporarily to reduce capacityD purge non-condensable gases to reduce the excess pressure

4.In the event of the cylinder starting valve leakage ______would pass into the air pipes and ignite the oil deposited.A.cooling waterB.vapor from the boilerC.starting airD.hot gases

更多“In a ______boiler the hot gases from the furnace pass through the tubes while the water is ”相关问题

  • 第1题：

    单选题
    Because of the reduced （） in the distillation system, some of the sea water boils as it flows through the tubes of the evaporator.
    A

    pressure

    B

    temperature

    C

    density

    D

    volume


    正确答案： B
    解析： 暂无解析

  • 第2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3题：

    单选题
    The rate of heat transfer between the hot and cold fluids passing through a shell-and-tube type heat exchanger will （）.
    A

    remain constant along the tubes length

    B

    be greatest in a single pass counter flow heat exchanger

    C

    remain constant throughout the heat exchanger

    D

    vary from section to section through out the heat exchanger


    正确答案： D
    解析： 暂无解析

  • 第4题：

    单选题
    In a （） boiler the hot gases from the furnace pass through the tubes while the water is on the outside.
    A

    water-tube

    B

    fire-tube

    C

    exhaust gas

    D

    None of the above is true


    正确答案： A
    解析： 暂无解析

  • 第5题：

    单选题
    Which of the following statements concerning fire-tube boilers is correct?（）
    A

    Combustion gases flow through the tubes

    B

    Flames impinge on the tubes

    C

    Combustion occurs in the tubes

    D

    Water flows through the tubes


    正确答案： D
    解析： 暂无解析

  • 第6题：

    单选题
    In （）, hot diesel engine jacket water passes over the stack and heats the sea water passing through the tubes.
    A

    a flash generator

    B

    a flash evaporator

    C

    a vacuum boiling evaporator

    D

    a boiler


    正确答案： D
    解析： 暂无解析

  • 第7题：

    单选题
    What does blowing tubes accomplish?（）
    A

    Eliminates unburned fuel oil residues from the firebox

    B

    Increases boiler efficiency

    C

    Flushes away mineral deposits inside the water tubes

    D

    Cleans soot deposits from the inside of the stack


    正确答案： D
    解析： 暂无解析

  • 第8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9题：

    单选题
    Impurities from the boiler water surface can be removed through the （）.
    A

    safety valve

    B

    blow down valve

    C

    scum valve

    D

    feed check valve


    正确答案： C
    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
    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12题：

    单选题
    In a （） boiler the water flows through the inside of the tubes while the hot gases pass around the outside.
    A

    water-tube

    B

    fire-tube

    C

    exhaust gas

    D

    none of the above


    正确答案： A
    解析： 暂无解析

  • 第13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14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15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16题：

    单选题
    The purpose of the programmed purge cycle on an automatically fired auxiliary boiler is to（）
    A

    cool the furnace to prevent pre-ignition

    B

    remove explosive vapors from the furnace

    C

    evaporate accumulated unburned fuel oil

    D

    provide sufficient air in the furnace to allow ignition of the fuel


    正确答案： B
    解析： 暂无解析

  • 第17题：

    单选题
    Why will a two stage flash type distilling plant tend to operate more efficiently when operating in cold seawater?（）
    A

    The colder seawater passing through the condenser tube bundles of the various stages increases evaporator vacuum

    B

    The amount of heated feed water discharged from the feed water heater after cndenser is increased

    C

    Fewer non-condensable gases are created by the flow of colder seawater

    D

    More seawater is allowed to pass through the flint stage overflow weir


    正确答案： B
    解析： 暂无解析

  • 第18题：

    单选题
    Fins are installed on the fireside of water-tubes used in waste boiler to（）
    A

    decrease the velocity of gases flowing past the tubes

    B

    increase the rate of heat transfer

    C

    reduce accumulations carbon deposits

    D

    direct the flow of gases


    正确答案： D
    解析： 暂无解析

  • 第19题：

    单选题
    Because of the reduced （） in the vacuum boiling evaporator, some of the sea water boils as it flows through the tubes.
    A

    temperature

    B

    water level

    C

    pressure

    D

    rate of flow


    正确答案： A
    解析： 暂无解析

  • 第20题：

    单选题
    A new water boiler was installed in our building last week, which could provide hot water to the students.
    A

    inspected carefully

    B

    placed in service

    C

    undertaken with care

    D

    undone casual


    正确答案： A
    解析：
    句意：上周我们楼里新安装了一个热水锅炉，可以给学生们提供热水。be placed in service安装投入使用。inspect carefully仔细调查。undertake with care谨慎行事。undo casually随意地解开。

  • 第21题：

    单选题
    When a vacuum boiling evaporator works, the hot jacket water will pass over the tube stack and （） the sea water passing through the tubes.
    A

    dispose

    B

    dissolve

    C

    heat

    D

    dissipates


    正确答案： A
    解析： 暂无解析

  • 第22题：

    单选题
    To avoid impingement attack, care must be taken with the water （） through the tubes of the heat exchangers.
    A

    temperature

    B

    velocity

    C

    density

    D

    viscosity


    正确答案： B
    解析： 暂无解析

  • 第23题：

    单选题
    One of the main purposes of refractories in a boiler furnace is to（）
    A

    help preheat the air for the furnaces

    B

    help preheat the feedwater

    C

    protect economizer from excessive heat

    D

    prevent excessive furnace heat losses


    正确答案： B
    解析： 暂无解析

相关内容