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单选题Which of the following statements concerning fire-tube boilers is correct?（）A Combustion gases flow through the tubesB Flames impinge on the tubesC Combustion occurs in the tubesD Water flows through the tubes

题目
单选题
Which of the following statements concerning fire-tube boilers is correct?（）
A

Combustion gases flow through the tubes

B

Flames impinge on the tubes

C

Combustion occurs in the tubes

D

Water flows through the tubes

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更多“Which of the following statements concerning fire-tube boile”相关问题

  • 第1题：

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

    Energy can be created or destroyed

    B

    Energy may not be transformed

    C

    The total quantity of energy in the universe is always the same

    D

    None of the above


    正确答案： D
    解析： 暂无解析

  • 第2题：

    多选题
    Which of the following statements are true? (Indicate all such statements.)
    A

    τ(5) =τ(7)

    B

    τ(5) τ(7) =τ(35)

    C

    τ(5) + τ(7) =τ(12)


    正确答案： A,B
    解析：
    5和7均只有两个正除数，因此根据题干信息，A项正确；35有四个正除数，所以B项也是正确的；12有6个正除数，因此C项错误；选择A、B两项。

  • 第3题：

    单选题
    Which of the following statements concerning butterfly valves is correct?（）
    A

    Special tools are required for lapping or grinding

    B

    It is impossible to throttle flow with a butterfly valve

    C

    To close the valve, it is only necessary to turn the handle a quarter of a turn

    D

    The butterfly valve should never be used in a freshwater system


    正确答案： C
    解析： 暂无解析

  • 第4题：

    单选题
    Which of the following statements is true concerning centrifugal pumps?（）
    A

    They are particularly suited for pumping high viscosity fluids

    B

    They are started with the discharge valve opened

    C

    The flow of liquid is developed by imparting energy due to the rotation of an impeller

    D

    They are always mounted in a horizontal position


    正确答案： C
    解析： 暂无解析

  • 第5题：

    单选题
    Which of the following statements is correct concerning a typical shipboard multi-coil refrigeration system?（）
    A

    The liquid receiver functions to collect and remove non-condensable gases

    B

    A thermostatic expansion valve is used to control refrigerated space temperature

    C

    Refrigerant temperature in an evaporator is directly related to refrigerant pressure

    D

    Dehydrators must be used continuously in a refrigeration system


    正确答案： C
    解析： 暂无解析

  • 第6题：

    单选题
    Which of the following statements is true concerning the cetane number of diesel fuel?（）
    A

    The cetane number affects the amount of injection lag

    B

    The cetane number is an indication of the fuels viscosity

    C

    Ignition lag is reduced with fuels having a high cetane number

    D

    The cetane number is of little significance in the combustion process


    正确答案： D
    解析： 暂无解析

  • 第7题：

    单选题
    Which of the following statements is true concerning an oil cooler?（）
    A

    The oil temperature is less than the cooling water temperature

    B

    The oil pressure is less than the cooling water pressure

    C

    The oil pressure is greater than the cooling water pressure

    D

    The oil flow control valve is always installed in the oil input line


    正确答案： C
    解析： 暂无解析

  • 第8题：

    单选题
    Which of the following statements is true concerning simple parallel resistance circuits?（）
    A

    The total current flow equals the sum of the individual currents

    B

    The total current flow equals the reciprocal of the sum of the individual currents

    C

    The total resistance equals the sum of the individual resistance

    D

    The total voltage equals the sum of the individual voltages across each resistance


    正确答案： A
    解析： 暂无解析

  • 第9题：

    单选题
    Which of the following statements is correct concerning the viscosity of lubricating oil?（）
    A

    Viscosity will increase as temperature increases

    B

    Viscosity is a measure of a fluid s internal resistance to flow

    C

    Viscosity will decrease as temperature decreases

    D

    Viscosity is not dependent on temperature


    正确答案： B
    解析： 暂无解析

  • 第10题：

    多选题
    Concerning the figure below, if a =b, which of the following statements must be true? (Indicate all such statements.)
    A

    c=d

    B

    l and k are parallel

    C

    m and l are perpendicular


    正确答案： C,B
    解析：
    根据题目中的已知信息无法推断出各直线的关系，因此B、C均不正确；而由图示可知，c和d分别是a和b的补角，由于a=b，所以c=d，A项正确。

  • 第11题：

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

    Cargoes are any type of goods transported by any type of ships

    B

    Cargoes are goods transported in bulk

    C

    Cargoes usually include goods transported in bulk and in containers

    D

    Cargoes are usually packaged in containers


    正确答案： D
    解析： 暂无解析

  • 第12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13题：

    单选题
    Which of the following statements is true concerning any evaporator?（）
    A

    High conductivity of the distillate indicates distillate salinity is excessive

    B

    Increasing the absolute pressure of the shell will increase the distillers capacity

    C

    Mesh separators are used in evaporators to filter the distillate

    D

    Reducing the brine density will reduce the heat lost overboard


    正确答案： D
    解析： 暂无解析

  • 第14题：

    单选题
    Which of the following statements concerning fire-tube boilers is correct?（）
    A

    Combustion gases flow through the tubes

    B

    Flames impinge on the tubes

    C

    Combustion occurs in the tubes

    D

    Water flows through the tubes


    正确答案： D
    解析： 暂无解析

  • 第15题：

    单选题
    Which of the following statements is correct concerning the “flash point ” of a liquid?（）
    A

    It is lower than the ignition temperature

    B

    It is the temperature at which a substance will spontaneously ignite

    C

    It is the temperature at which a substance, when ignited, will continue to bum

    D

    It is the temperature at which the released vapors will fall within the explosive range


    正确答案： A
    解析： 暂无解析

  • 第16题：

    单选题
    Which of the following statements concerning fuel atomization in a diesel engine cylinder is correct?（）
    A

    The greater the atomization, the greater the penetration

    B

    The greater the atomization, the less the penetration

    C

    The degree of atomization has nothing to do with the degree of penetration

    D

    Atomization and penetration are one and the same


    正确答案： D
    解析： 暂无解析

  • 第17题：

    单选题
    Which of the following statements is true concerning Halon 1301 fire extinguishing equipment?（）
    A

    The agent is considered nontoxic at room temperature in low concentrations

    B

    The agent is less effective than carbon dioxide

    C

    Halon primarily extinguishes the fire by cooling

    D

    The agent cannot be used on electrical fires because it leaves a residue


    正确答案： B
    解析： 暂无解析

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