Which of the following modes of heat transfer does NOT require any physical contact between a warmer and a cooler substance?A.RadiationB.ConductionC.Natural convectionD.contact directly

题目

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.contact directly

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4.第二组The only attention that heat exchanger should require is to ensure that the heat transfer surfaces remain substantially clean and the flow passages generally clear of obstruction. Indication that undue fouling is occurring is given by a progressive increase in the temperature difference between the two fluids, over a period of time, usually accompanied by a noticeable rise in pressure loss at a given flow.Fouling on the sea-water side is the most usual cause of deterioration in performance. The method of cleaning the sea water-side surfaces depends on the type of heat exchanger. With shell-and-tube heat exchangers, the removal of the header covers or, m the case of the smaller heat exchangers, the headers themselves, will provide access to the tubes. Obstructions, dirt, scale etc., can then be removed, using the tools provided by the heat exchanger manufacturer. Flushing through with fresh water is recommended before a heat exchanger is returned to service. In some applications, such as piston oil cooling, progressive fouling may take place on the outside of the tubes. Most manufactures recommend a chemical flushing pr6cess to remove this in situ~ without dismantling the heat exchanger.Plate heat exchangers may be cleaned by unclamping the stack of plates and mechanically cleaning the surface of each plate as recommended by the manufacturers. The plate seals may require replacement from time to time and here the manufacturers&39; instructions should be closely followedBy which of the following indication, can we conclude that the lube oil-sea water heat exchanger is unduly fouled?A.the heat exchanger lube oil inlet temperature loweringB.the heat exchanger sea-water outlet pressure riseC.the heat exchanger temperature difference between lube oil and sea water increasingD.the heat exchanger pressure difference between sea water inlet and outlet decreasing

更多“Which of the following modes of heat transfer does NOT require any physical contact between a warmer and a cooler substance?A.RadiationB.ConductionC.Natural convectionD.contact directly”相关问题

  • 第1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：A

  • 第2题：

     What level of control does a subflow have on the overall contact?（）

    • A、The subflow cannot call additional or "nested" subflows. 
    • B、The subflow cannot transfer the contact to another resource. 
    • C、The subflow has full contact control and can perform any action that the parent flow can perform.

    正确答案:C

  • 第3题：

    In the context of Advanced Power Virtualization， the shared pool refers to which of the following？（）

    • A、A pool of physical memory that can be used by any partition
    • B、A pool of physical processors that can be used by any virtual or dedicated partition
    • C、A pool of physical memory that can be used by multiple Micro-Partitions
    • D、A pool of physical processors that can be used by multiple Micro-Partitions

    正确答案:D

  • 第4题：

    Company.com would like to have the processor resources on their system efficiently shared between logical partitions， but does not require management of memory or I/O resources. Which of the following would accomplish this requirement？（）

    • A、HMC command line
    • B、Uncapped processors
    • C、Partition Load Manager
    • D、Enterprise Workload Manager

    正确答案:B

  • 第5题：

    单选题
    The rate of heat transfer from a hot region to a cold region is affected most by the （）.
    A

    size of the heat sink

    B

    temperature difference between the regions

    C

    size of the heat source

    D

    total heat of the system


    正确答案： C
    解析： 暂无解析

  • 第6题：

    单选题
    Which of the lists forms of heat transfer, if any, is illustrated by the flow of combustion gases through a boiler?（）
    A

    Natural convection only

    B

    Forced convection only

    C

    Both natural convection and forced convection

    D

    None


    正确答案： B
    解析： 暂无解析

  • 第7题：

    单选题
    In the context of Advanced Power Virtualization， the shared pool refers to which of the following？（）
    A

    A pool of physical memory that can be used by any partition

    B

    A pool of physical processors that can be used by any virtual or dedicated partition

    C

    A pool of physical memory that can be used by multiple Micro-Partitions

    D

    A pool of physical processors that can be used by multiple Micro-Partitions


    正确答案： A
    解析： 暂无解析

  • 第8题：

    单选题
    An after-cooler installed between the turbocharger and the cylinder air inlet （）
    A

    increases the density of the air

    B

    decrease the density of the air

    C

    increases the specific heat of the air

    D

    decreases the specific heat of the exhaust


    正确答案： C
    解析： 暂无解析

  • 第9题：

    单选题
    If you observe any situation which presents a safety or pollution hazard during fuel transfer operations, which of the following actions should be taken FIRST?（）
    A

    Close the valves at the transfer manifold

    B

    Notify the person in charge of the shore facility

    C

    Shut down the transfer operation

    D

    Sound the fire alarm


    正确答案： D
    解析： 暂无解析

  • 第10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： D
    解析： 暂无解析

  • 第11题：

    单选题
    Cylinder linings constructed as an integral part of the block, are characterized by which of the following disadvantages?（）
    A

    They conduct heat poorly

    B

    They are expensive

    C

    They cannot be replaced

    D

    They require special tools for removal


    正确答案： A
    解析： 暂无解析

  • 第12题：

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

    Heat is always transferred at a constant rate

    B

    Heat transfer rate increases as temperature difference increases

    C

    The rate of heat transfer is not affected by temperature difference

    D

    The high temperature region is known as a heat sink


    正确答案： A
    解析： 暂无解析

  • 第13题：

    Which of the following multicast mode does Auto-RP require？（）

    • A、Link-mode
    • B、Dense mode
    • C、Sparse mode
    • D、Sparse-dense mode

    正确答案:B

  • 第14题：

    Which of the following is a software layer that interacts between the virtualized operating system and the physical hardware？（）

    • A、 System Resource Manager
    • B、 Server BIOS
    • C、 Guest Operating System
    • D、 Hypervisor

    正确答案:D

  • 第15题：

    Which of the following operations does not require Oracle to store information in an UNDO segments as part of the transaction?（）

    • A、INSERT 
    • B、SELECT 
    • C、UPDATE 
    • D、DELETE

    正确答案:B

  • 第16题：

    Which of the following does a star ring topology use for data transfer?（）

    • A、CSMA/CD
    • B、CSMA/CA
    • C、CHAP
    • D、Token passing

    正确答案:D

  • 第17题：

    单选题
    Which of the following statements describes the relationship between viscosity and specific gravity?（）
    A

    Liquids with different viscosities will always have the same specific gravity

    B

    Liquids with different viscosities will never have the same specific gravity

    C

    Viscosity and specific gravity are directly proportional

    D

    Viscosity and specific gravity are not related in that one does not define or limit the other


    正确答案： D
    解析： 暂无解析

  • 第18题：

    单选题
    As a watch officer when bunkering, which of the following does require his individual attention?（）
    A

    draft of the vessel

    B

    rate of delivery

    C

    communication with terminal personnel

    D

    observation of manifold valves


    正确答案： A
    解析： 暂无解析

  • 第19题：

    单选题
    Which of the listed methods of heat transfer takes place when two substances of different temperatures are in physical contact with each other?（）
    A

    Radiation

    B

    Conduction

    C

    Convection

    D

    Each of the above


    正确答案： A
    解析： 暂无解析

  • 第20题：

    单选题
    What level of control does a subflow have on the overall contact?（）
    A

    The subflow cannot call additional or nested subflows. 

    B

    The subflow cannot transfer the contact to another resource. 

    C

    The subflow has full contact control and can perform any action that the parent flow can perform.


    正确答案： C
    解析： 暂无解析

  • 第21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22题：

    多选题
    Which of the following require physical CD/DVD media to be ordered and received prior to patching and/or upgrading IPCC Express 4.0?（）
    A

    Major Release

    B

    Minor Release

    C

    Maintenance Release

    D

    Service Release

    E

    Engineering Special


    正确答案： D,E
    解析： 暂无解析

  • 第23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： D
    解析： 暂无解析

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