Spontaneous combustion is caused by ______．A.An outside heat source heating a substance until it ignitesB.Conduction of heat through a wall of material to the substanceC.Chemical action within a substanceD.All of the above

题目

Spontaneous combustion is caused by ______．

A.An outside heat source heating a substance until it ignites

B.Conduction of heat through a wall of material to the substance

C.Chemical action within a substance

D.All of the above

相似考题

1.Which of the following statements represents the function of the compression rings installed at the top of a diesel Engine piston?A.Control the amount of lube oil burned in the combustion chamberB.Transmit heat from the piston to the cylinder linerC.Prevent damage to ring groove inserts by acting as a heat damD.Dissipate combustion chamber gas pressure by channeling it through the ring gap

2.Fires resulting from spontaneous(自发的) combustion are usually caused by the improper disposal of______.A.cigarette butts(烟头)B.oily ragsC.burner torchesD.lighted matches

3.The sum of the sensible heat and the latent heat of any substance is known as ______.A.total heatB.residual heatC.specific heatD.superheat

4.The three basic components of a fire are chain reaction, heat, fuel, and ____.A.carbon monoxideB.oxygenC.carbon dioxideD.any gaseous substance

更多“Spontaneous combustion is caused by ______.A.An outside heat source heating a substance un ”相关问题

  • 第1题：

    Spontaneous ignition can result from ______.

    A.an unprotected drop-light bulb

    B.careless disposal or storage of material

    C.smoking in bed

    D.worn electrical wires on power tools


    正确答案：B

  • 第2题：

    Which substance might be subject to spontaneous combustion ________．

    A.Coal

    B.Scrap rubber

    C.Leather

    D.All of the above


    正确答案：D

  • 第3题：

    What quality of a diesel fuel is most significant for efficient combustion ________．

    A.Volatility

    B.Viscosity

    C.Flash point

    D.Specific heat


    正确答案：A

  • 第4题：

    单选题
    Fires resulting from spontaneous combustion are usually caused by the improper disposal of（）.
    A

    cigarette butts

    B

    oily rags

    C

    burner torches

    D

    lighted matches


    正确答案： D
    解析： 暂无解析

  • 第5题：

    单选题
    The most likely place for a fire to start through the process of spontaneous combustion is in （）.
    A

    an electrical switchboard

    B

    the pressure tanks

    C

    the fuel oil tanks

    D

    the oily rag bin


    正确答案： D
    解析： 暂无解析

  • 第6题：

    单选题
    Incomplete combustion in a running diesel engine can cause piston rings to become stuck as a result of （）
    A

    residual carbon deposits

    B

    lube oil viscosity breakdown

    C

    uneven heat expansion of the rings

    D

    uneven heat expansion of the piston


    正确答案： B
    解析： 暂无解析

  • 第7题：

    单选题
    Which of the following modes of heat transfer does NOT require any physical contact between a warmer and a cooler substance?（）
    A

    Radiation

    B

    Conduction

    C

    Natural convection

    D

    All of the above


    正确答案： C
    解析： 暂无解析

  • 第8题：

    单选题
    Which of the following statements is correct concerning heat transfer?（）
    A

    Heat is given off from a high temperature region known as a heat sink

    B

    Heat transfer rate is affected most by the size of the heat sink involved

    C

    Heat transfer rate is affected most by the temperature difference between the heat source and the heat sink

    D

    Heat transfer by radiation will occur only by mass motion of a fluid substance


    正确答案： C
    解析： 暂无解析

  • 第9题：

    单选题
    The lowest temperature required to cause self-sustained combustion of a substance independent of any outside source of ignition is called （）.
    A

    explosive range

    B

    flash point

    C

    ignition temperature

    D

    combustion temperature


    正确答案： B
    解析： 暂无解析

  • 第10题：

    单选题
    Air circulation is caused or affected by（）.
    A

    the rotation of the earth on its axis

    B

    convection currents caused by differences in radiant heating between equatorial and polar regions

    C

    mountain ranges

    D

    All of the above


    正确答案： D
    解析： 暂无解析

  • 第11题：

    单选题
    （）is the most liable to spontaneous combustion.
    A

    Cement

    B

    Chinaware

    C

    Fish meal

    D

    Steel products


    正确答案： C
    解析： 暂无解析

  • 第12题：

    单选题
    Many cast iron pistons are designed with heat dams, which serve to （）
    A

    keep piston crown temperatures elevated for smoother combustion

    B

    reduce the possibility of overheating the top compression ring

    C

    help retain the heat of compression to prevent ignition delay

    D

    help retain the heat of compression to prevent combustion knock


    正确答案： A
    解析： 暂无解析

  • 第13题：

    ______ is the most liable to spontaneous combustion．

    A.Cement

    B.Chinaware

    C.Fish meal

    D.Steel products


    正确答案：C

  • 第14题：

    The lowest temperature required to cause self-sustained combustion of a substance independent of any outside source of ignition is called ______．

    A.Explosive range

    B.Flash point

    C.Ignition temperature

    D.Combustion temperature


    正确答案：C

  • 第15题：

    单选题
    Spontaneous combustion could occur in（）
    A

    paint thinner in an open can

    B

    fuel accumulation in the bilge

    C

    oily rags in an unvented compartment

    D

    gasoline stored in steel drums


    正确答案： C
    解析： 暂无解析

  • 第16题：

    单选题
    The Earth’s irregular heating is caused by （）.
    A

    the time of day

    B

    the seasons

    C

    geography

    D

    All of the above


    正确答案： B
    解析： 暂无解析

  • 第17题：

    单选题
    The sum of the sensible heat and the latent heat of any substance is known as （）.
    A

    total heat

    B

    residual heat

    C

    specific heat

    D

    superheat


    正确答案： D
    解析： 暂无解析

  • 第18题：

    单选题
    Which of the following statements represents the function of the compression rings installed at the top of a diesel Engine piston?（）
    A

    Control the amount of lube oil burned in the combustion chamber

    B

    Transmit heat from the piston to the cylinder liner

    C

    Prevent damage to ring groove inserts by acting as a heat dam

    D

    Dissipate combustion chamber gas pressure by channeling it through the ring gap


    正确答案： D
    解析： 暂无解析

  • 第19题：

    单选题
    The four basic components of a fire are chain reaction, heat, fuel, and （）.
    A

    carbon monoxide

    B

    oxygen

    C

    carbon dioxide

    D

    any gaseous substance


    正确答案： A
    解析： reaction：反应；carbon:碳；monoxide：一氧化碳；dioxide：二氧化物；gase-ous:气态的【译文】：产生火灾的4个基本条件为可燃物(燃油)、助燃物(氧气)、火源(热量)和链反应。

  • 第20题：

    单选题
    For a fire to begin there must be present a combustible material, oxygen or air to （）combustion, and a source of heat at a temperature high enough to start combustion.
    A

    begin

    B

    support

    C

    last

    D

    extinguish


    正确答案： B
    解析： 暂无解析

  • 第21题：

    单选题
    Which of the following is true of the heating system of the Johnstown campus?
    A

    The heat is supplied by human bodies only.

    B

    The heat is supplied by both human bodies and other heat-emitting objects.

    C

    The heat is supplied by both human bodies and conventional fuel.

    D

    The heat is supplied by human bodies, other heat-emitting objects, and conventional fuel.


    正确答案： A
    解析：

  • 第22题：

    单选题
    The heat required to change a substance from a liquid to a gas without experiencing a temperature change is defined as the latent heat of （）.
    A

    fusion

    B

    vaporization

    C

    sublimation

    D

    condensation


    正确答案： B
    解析： 暂无解析

  • 第23题：

    单选题
    For cargoes（）grain meals,coal,ventilation is needed to prevent them（）spontaneous combustion.
    A

    i.e./of

    B

    for instance/away

    C

    for example/off

    D

    such as/from


    正确答案： B
    解析： 暂无解析

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