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

题目

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

相似考题

1.A diesel engine experiences a sudden loss in speed, accompanied by black exhaust smoke, with the fuel rack at maximum, and speed remaining below normal .the probable ___.A.engine overloadB.leaky valvesC.stuck or broken piston ringsD.low air injection pressure

2.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 overheatingB To ensure the fuel nozzles are flushed cleanC To clear the smoke stackD To let the waste heat boiler reduce its rate of steam generation

3.单选题For a diesel engine, individual cylinder performance is commonly determined by exhaust gas（）A chemical analysisB back pressure readingsC pyrometer readingsD infrared analysis

4.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

更多“The maximum pressure developed by a waste heat boiler is determined by the main engine exh ”相关问题

  • 第1题：

    单选题
    Which of the following items is necessary for all waste heat boiler installations, regardless of design or manufacturer? （）
    A

    Control of evaporation

    B

    A separate means to prevent feed-water contamination

    C

    Power circulating pump

    D

    Super-heater


    正确答案： A
    解析： 暂无解析

  • 第2题：

    单选题
    Due to the large amount of heat picked up by the air in boiler and engine rooms, it would be （） to maintain ambient conditions within the comfort zone by air conditioning.
    A

    possible

    B

    necessary

    C

    practicable

    D

    impracticable


    正确答案： C
    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
    In a trunk type diesel engine piston, the thickness of the head or crown is determined by the（） Ⅰ.statically balanced Ⅱ.heat dissipation requirement
    A

    Ⅰ only

    B

    Ⅱ only

    C

    both Ⅰ and Ⅱ

    D

    neither Ⅰ nor Ⅱ


    正确答案： D
    解析： 暂无解析

  • 第5题：

    单选题
    Proper lubrication of the main bearing is more easily obtained in a single acting four-stroke/cycle diesel engine than in a single acting two-stroke/cycle diesel engine because （）
    A

    bearing pressure in a four-stroke/cycle acting single diesel engine is continually reversed

    B

    bearing pressure in a two-stroke/cycle single acting diesel engine is continually reversed

    C

    the maximum bearing pressure is higher in a single acting two-stroke/cycle diesel engine

    D

    two-stoke/cycle diesel engines require more complicated lubrication piping


    正确答案： B
    解析： 暂无解析

  • 第6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7题：

    单选题
    If the action of the engine indicates that some of the cylinders are not firing, the ones affected may be determined by watching （）.
    A

    the bad smoke

    B

    the smoky exhaust

    C

    the exhaust temperature

    D

    the peak pressure


    正确答案： B
    解析： 暂无解析

  • 第8题：

    单选题
    In a closed diesel engine freshwater cooling system, the amount of coolant flowing through the heat exchanger is controlled by the （）.
    A

    suction pressure regulator

    B

    thermostatic bypass valve

    C

    sea water temperature

    D

    water level in the expansion tank


    正确答案： B
    解析： 暂无解析

  • 第9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10题：

    单选题
    An increase in the air inlet manifold pressure of a diesel engine will result in a/an （）.
    A

    decrease in maximum cylinder pressure

    B

    increase in ignition lag

    C

    decrease in fuel consumption per horsepower-hour

    D

    decrease in exhaust manifold pressure


    正确答案： C
    解析： 暂无解析

  • 第11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

  • 第12题：

    单选题
    The starting air bottle should be pumped up to maximum pressure by the （） before start of the engine.
    A

    air compressor

    B

    refrigeration compressor

    C

    vacuum pump

    D

    purifier


    正确答案： D
    解析： 暂无解析

  • 第13题：

    单选题
    The main purpose of warming the parts of the main engine is （）
    A

    to reduce heat stress

    B

    to reduce low temperature corrosion

    C

    to improve firing and starting performance

    D

    fuel saving


    正确答案： C
    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
    The main purpose of inspection for a running diesel engine is（）
    A

    testing for the mechanical load and the thermal load

    B

    inspecting thermal and mechanical condition of the engine

    C

    inspecting each system and exhaust temperature

    D

    testing for compress pressure and explosion pressure


    正确答案： D
    解析： 暂无解析

  • 第16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17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
    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
    Which statement about diesel engine combustion is true?（）
    A

    Combustion does not begin until the piston starts down on the power stroke

    B

    Maximum combustion pressure is reached before TDC

    C

    Turbulence in the cylinder causes a delay in ignition

    D

    Maximum cylinder firing pressure is not developed until the piston passes TDC


    正确答案： A
    解析： 暂无解析

  • 第21题：

    单选题
    While inspecting the main bearings on a diesel engine you find impregnated dirt and scratches in the bearing surface you would, therefore, suspect that （）
    A

    the bearing had been overheated

    B

    water was present in the oil

    C

    the lube oil was not being properly filtered

    D

    the maximum allowable bearing pressure had been exceeded


    正确答案： D
    解析： 暂无解析

  • 第22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

  • 第23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

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