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 temperat

题目

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 loads

B.erosion at high engine loads

C.overload at high engine loads

D.scaling at all exhaust temperatures

相似考题

1.A water jacket is placed around the exhaust manifolds of propulsion diesel enginesto( ).A.reduce heat radiation to the engine roomB.aid in preventing turbocharger overheatingC.condense and drain moisture from exhaust gasesD.dampen exhaust gas pulsations in the manifold

2.Which of the following conditions could contribute to the cracking of a diesel engine cylinder head?A.Leaking seal ringB.Insufficient heat transfer from the exhaust valvesC.Blocked cooling water passages to the headD.Excessive scavenging air provided to the engine

3.The maximum pressure developed by a waste heat boiler is determined by the main engine exhaust ______.A.gas compositionB.gas temperatureC.pressureD.timing

4.In an auxiliary diesel engine bypass type lubricating oil system, the main lube oil pump forces_______ .A.all of the oil used by the engine through a filterB.some of the oil used by the engine through a filterC.some of the oil used by the engine through a centrifugeD.all of the oil used by the engine through a centrifuge

参考答案和解析
正确答案：A
更多“A bypass line provided around a waste heat auxiliary boiler in a diesel engine exhaust sys ”相关问题

  • 第1题：

    单选题
    Before shutting off the fuel supply to stop a medium or high–speed diesel engine, why is it necessary to allow the engine to idle for a few minutes?（）
    A

    To prevent internal damage form local overheating

    B

    To ensure the fuel nozzles are flushed clean

    C

    To clear the smoke stack

    D

    To let the waste heat boiler reduce its rate of steam generation


    正确答案： D
    解析： 暂无解析

  • 第2题：

    单选题
    White smoke issuing from the exhaust of an auxiliary diesel engine valve opening （）
    A

    the engine is overloaded

    B

    the engine is cold

    C

    there is too much lube oil in the cylinders

    D

    the turbocharger is fouled


    正确答案： D
    解析： 暂无解析

  • 第3题：

    单选题
    The diesel engine exhaust gas bypass, as fitted with some waste heat boilers, is installed to （）
    A

    prevent engine back pressure at heavy loads

    B

    increase total engine efficiency at low loads

    C

    prevent boiler corrosion at low engine loads

    D

    improve engine fuel consumption at any load


    正确答案： C
    解析： 暂无解析

  • 第4题：

    单选题
    If the jacket water temperature in an auxiliary diesel engine cooling system is lower than normal, the probable cause is （）
    A

    air binding of the engine cooling system

    B

    a cracked water cooled exhaust manifold

    C

    blockage in the heat exchanger

    D

    faulty operation of the thermostat


    正确答案： B
    解析： 暂无解析

  • 第5题：

    单选题
    High exhaust temperature and black smoke exhausting from an auxiliary diesel engine can be caused by （）.
    A

    engine overload

    B

    low combustion temperature

    C

    plugged fuel nozzle holes

    D

    excessive compression pressure


    正确答案： C
    解析： 暂无解析

  • 第6题：

    单选题
    Diesel engine waste heat boiler construction is usually of the fire-tube or（）
    A

    cyclone furnace boiler type

    B

    dry back boiler type

    C

    water-tube type

    D

    critical circulation boiler type


    正确答案： A
    解析： 暂无解析

  • 第7题：

    单选题
    Exhaust pipes for separate diesel engines can be combined only when （）
    A

    space limitations prevent separately run pipes

    B

    the engines are small auxiliary units

    C

    they are arranged to prevent gas backflow to each engine

    D

    a waste heat boiler is installed


    正确答案： D
    解析： 暂无解析

  • 第8题：

    单选题
    If an auxiliary diesel engine frequently stalls, the trouble may be caused by （）
    A

    low exhaust back pressure

    B

    air in the fuel system

    C

    gasket blow-by or leakage

    D

    incorrect assembly of idler springs


    正确答案： C
    解析： 暂无解析

  • 第9题：

    单选题
    Trunk-type diesel engine pistons are most effectively cooled by heat（）
    A

    conducted through the engine block

    B

    conducted to water cooled cylinder walls

    C

    conducted through the piston crown

    D

    loss to escaping exhaust gases


    正确答案： A
    解析： 暂无解析

  • 第10题：

    单选题
    The PRIMARY function of a waste heat boiler is to （）.
    A

    reduce engine exhaust noise

    B

    reduce engine back pressure

    C

    recover heat which otherwise would be lost

    D

    increase turbocharger efficiency


    正确答案： B
    解析： 暂无解析

  • 第11题：

    单选题
    An electrically driven automatically operating auxiliary blower is provided for slow speed and （） of a low speed diesel engine.
    A

    manoeuvring operations

    B

    bad combustion

    C

    cooling

    D

    mooring trial


    正确答案： A
    解析： 暂无解析

  • 第12题：

    单选题
    A SECONDARY function of a waste heat boiler is to （）.
    A

    reduce engine exhaust noise

    B

    reduce engine back pressure

    C

    increase engine cycle efficiency

    D

    increase turbocharger efficiency


    正确答案： B
    解析： 暂无解析

  • 第13题：

    单选题
    A water jacket is placed around the exhaust manifolds of propulsion diesel engines to（）
    A

    reduce heat radiation to the engine room

    B

    aid in preventing turbocharger overheating

    C

    condense and drain moisture from exhaust gases

    D

    dampen exhaust gas pulsations in the manifold


    正确答案： A
    解析： 暂无解析

  • 第14题：

    单选题
    An exhaust gas bypass is installed on a waste heat boiler in order to （）.
    A

    bypass exhaust gas at high loads to prevent excessive back pressure

    B

    bypass a portion of the exhaust gas at peak loads for better efficiency

    C

    recycle exhaust gas to the turbocharger

    D

    minimize moisture condensation in the boiler gas passages at low loads


    正确答案： B
    解析： 暂无解析

  • 第15题：

    单选题
    Which of the following conditions could contribute to the cracking of a diesel engine cylinder head?（）
    A

    Leaking seal ring

    B

    Insufficient heat transfer from the exhaust valves

    C

    Block cooling water passages to the head

    D

    Excessive scavenging air provided to the engine


    正确答案： C
    解析： 暂无解析

  • 第16题：

    单选题
    An auxiliary diesel engine may fail to start due to（）
    A

    low exhaust back pressure

    B

    high lube oil temperature

    C

    insufficient cranking speed

    D

    excessive fuel atomization


    正确答案： A
    解析： 暂无解析

  • 第17题：

    单选题
    Trunk type diesel engine pistons are effectively cooled when heat is（）
    A

    radiated through the engine block

    B

    transferred to water cooled cylinder walls

    C

    conducted through the piston crown

    D

    transferred to escaping exhaust gases


    正确答案： B
    解析： 暂无解析

  • 第18题：

    单选题
    The maximum pressure developed by a waste heat boiler is determined by the main engine exhaust （）.
    A

    gas composition

    B

    gas temperature

    C

    pressure

    D

    timing


    正确答案： A
    解析： 暂无解析

  • 第19题：

    单选题
    In motor ship, （） is often used to recover some of the heat carried in the exhaust gases from the main engine.
    A

    an diesel oil heater

    B

    a waste heat boiler

    C

    a fresh water generator

    D

    all the above


    正确答案： C
    解析： 暂无解析

  • 第20题：

    单选题
    If the turbocharger failed on an auxiliary diesel engine, which of the following conditions would probably occur?（）
    A

    Full power cannot be developed

    B

    The exhaust will contain black smoke

    C

    Complete combustion will be impossible

    D

    All of the above


    正确答案： D
    解析： 暂无解析

  • 第21题：

    单选题
    When a diesel engine compression pressure is checked, the indicator is connected to the （）
    A

    cylinder exhaust ports

    B

    injection line

    C

    cylinder indicator cock

    D

    banjo oiler line


    正确答案： C
    解析： 暂无解析

  • 第22题：

    单选题
    If you observe smoke coming from the turbocharger of an auxiliary diesel engine, you should（）
    A

    check the air filter for obstruction

    B

    check for an exhaust leak

    C

    check the exhaust temperature

    D

    secure the engine


    正确答案： D
    解析： 暂无解析

  • 第23题：

    单选题
    A waste heat boiler is installed on some diesel propelled vessels to （）.
    A

    provide steam for emergency propulsion

    B

    provide steam for the turbo-generator

    C

    heat the waste water tanks

    D

    steam for warming engines


    正确答案： D
    解析： 暂无解析

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