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 boilerB.abnormally high feed-water temperatureC.abnormally high boiler water temperatureD.steam demand exceeding f

题目

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

相似考题

1.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

2.辅助给水系统/应急给水系统 auxiliary feed water system/emergency feed water system

3.单选题Which of the following items is necessary for all waste heat boiler installations, regardless of design or manufacturer? （）A Control of evaporationB A separate means to prevent feed-water contaminationC Power circulating pumpD Super-heater

4.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

更多“If the feed pump for an auxiliary boiler fails to deliver the feed water to the boiler, th ”相关问题

  • 第1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2题：

    单选题
    What is NOT a function of the steam drum of a marine water-tube boiler（）.
    A

    Receives saturated steam from the generating tubes

    B

    Serves as a reservoir of boiler feed water

    C

    Holds internal fittings for separation of moisture from steam

    D

    Collects steam exhausted from the turbines


    正确答案： C
    解析： 暂无解析

  • 第3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4题：

    单选题
    The boiler feed water check valves are located on the （）
    A

    feed pump suction line

    B

    hot well

    C

    shell of the feed heater

    D

    feed lines to the boiler


    正确答案： C
    解析： 暂无解析

  • 第5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6题：

    单选题
    Excessive vibration of an automatically fired auxiliary boiler can be caused by （）
    A

    air or water in the furnace

    B

    combustion pulses

    C

    fuel oil pump failure

    D

    flame failure


    正确答案： D
    解析： 暂无解析

  • 第7题：

    单选题
    For proper operation, auxiliary boiler feed water must have which of the following characteristics?（）
    A

    High oxygen concentration

    B

    Low pH

    C

    Proper alkalinity

    D

    All of the above


    正确答案： C
    解析： 暂无解析

  • 第8题：

    单选题
    The water level in a steaming auxiliary boiler will always （）
    A

    rise when the steam pressure is increased

    B

    remain constant as long as the feed pump operates

    C

    fall when the steam pressure is decreased

    D

    vary as the steam demand changes


    正确答案： D
    解析： 暂无解析

  • 第9题：

    单选题
    Improper maintenance of the fuel oil burners in an automatically fired auxiliary boiler, could result in （）
    A

    increased fuel consumption

    B

    increased feed water consumption

    C

    fuel pump failure

    D

    combustion control system failure


    正确答案： A
    解析： 暂无解析

  • 第10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11题：

    单选题
    The feed water to the boiler will comprise （）.
    A

    condensate

    B

    a small amount of make-up feed

    C

    A and B

    D

    None of the above


    正确答案： D
    解析： 暂无解析

  • 第12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13题：

    单选题
    The purpose of a temperature sensing device installed in the stack of a small automatically fired auxiliary steam boiler is to secure the oil burner（）
    A

    in the event of a flame failure

    B

    in the event of a stack fire

    C

    when the water level reach the crown sheet

    D

    when the feed pump discharge pressure drops to a preset minimum


    正确答案： D
    解析： 暂无解析

  • 第14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15题：

    单选题
    Improper maintenance of an automatic auxiliary boiler oil burner could result in （）.
    A

    fuel pump failure

    B

    fan motor failure

    C

    increased feedwater consumption

    D

    decreased boiler efficiency


    正确答案： B
    解析： 暂无解析

  • 第16题：

    单选题
    Oxygen corrosion in auxiliary boilers is prevented by treating the boiler feed tank with either sodium （）
    A

    sulfite or hydrazine

    B

    sulfite or hygroscopic sulfite

    C

    bromide or hydrazine

    D

    bromide or hygroscopic sulfite


    正确答案： D
    解析： 暂无解析

  • 第17题：

    单选题
    The valve that prevents water from backing out of the boiler into the feed line is the（）.
    A

    bottom-blow valve

    B

    skin valve

    C

    feed-check valve

    D

    feed-stop valve


    正确答案： B
    解析： 暂无解析

  • 第18题：

    单选题
    A feed pump for an auxiliary boiler might lose suction if the （）.
    A

    boiler water level is low

    B

    feedwater is too hot

    C

    boiler steam demand is low

    D

    feedwater is too cold


    正确答案： A
    解析： 暂无解析

  • 第19题：

    单选题
    The boiler feed pump discharge pressure is higher than the steam drum pressure to （）.
    A

    ensure feed water flow into the boiler

    B

    keep the steam drum pressure high

    C

    prevent water hammer in the feed line

    D

    help the feed water flash to steam


    正确答案： A
    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
    Which of the following conditions could cause the feed pump for an auxiliary boiler to lose suction?（）
    A

    Increased suction head pressure

    B

    Decreased feedwater temperature

    C

    Pump recirculating line being open too much

    D

    Excessive feedwater temperature


    正确答案： B
    解析： 暂无解析

  • 第22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23题：

    单选题
    As for an oil-fired boiler if at a normal steaming condition and water goes out of sight in gauge glasses the action you should take is: （） (1) secure oil to fires (2) increase feed pump pressure
    A

    （1）

    B

    （1）and（2）

    C

    （2）

    D

    neither（1）nor（2）


    正确答案： B
    解析： 暂无解析

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