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A firebox explosion in an automatically fired auxiliary boiler may be the result of ______.A.excessive purging before lighting offB.insufficient trail for ignition periodC.a faulty transformer in the ignition circuitD.insufficient purging before lighting

题目

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

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.A bypass line provided around a waste heat auxiliary boiler in a diesel engine exhaust system, may be used to avoid boiler ______.A.corrosion at low engine loadsB.erosion at high engine loadsC.overload at high engine loadsD.scaling at all exhaust temperatures

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

4.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 feed pump capacity

更多“A firebox explosion in an automatically fired auxiliary boiler may be the result of ______ ”相关问题

  • 第1题：

    单选题
    Auxiliary diesel engines can be automatically shut down as a result of （）
    A

    low lube oil temperature

    B

    low lube oil pressure

    C

    high exhaust temperature

    D

    high cooling water pressure


    正确答案： C
    解析： 暂无解析

  • 第2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3题：

    单选题
    Failure of the burner flame in an auxiliary boiler would probably be a result of（）
    A

    water in the fuel oil

    B

    broken high tension leads

    C

    incorrect electrode setting

    D

    full fuel pressure at the nozzle


    正确答案： D
    解析： 暂无解析

  • 第4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5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6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7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8题：

    单选题
    Ignition failure in an automatically controlled auxiliary boiler could be caused by（）
    A

    carbon deposits on the flame scanner

    B

    high fuel oil temperature

    C

    low fuel oil viscosity

    D

    high steam pressure


    正确答案： B
    解析： 暂无解析

  • 第9题：

    单选题
    Burner ignition failure in an automatically fired auxiliary boiler would be caused by（）
    A

    a burned out solenoid in the oil supply valve

    B

    high temperature excess air

    C

    incorrectly setting the hot-well dump valve

    D

    an incorrectly positioned burner snubber realy


    正确答案： D
    解析： 暂无解析

  • 第10题：

    单选题
    The boiler is fired （） the demand for steam exceeds that available from exhaust gas heating.
    A

    whenever

    B

    however

    C

    wherever

    D

    whether


    正确答案： A
    解析： 暂无解析

  • 第11题：

    单选题
    Flame failure in an automatically fired auxiliary boiler can from a/an （）
    A

    incorrect electrode setting

    B

    incorrect nozzle position

    C

    clogged fuel nozzle

    D

    broken high tension lead


    正确答案： D
    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：

    单选题
    The concentration of total dissolved solids in the water of an auxiliary boiler can increase as a result of （）.
    A

    seawater contamination

    B

    frequent surface blows

    C

    dissolved oxygen deaeration

    D

    frequent bottom blows


    正确答案： B
    解析： 暂无解析

  • 第14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
    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18题：

    单选题
    When there is a flame failure in an automatically fired auxiliary boiler, the （）.
    A

    air supply is shut off

    B

    fuel supply is shut off

    C

    water supply is shut off

    D

    safety valve lifts


    正确答案： A
    解析： 暂无解析

  • 第19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
    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
    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

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