单选题The centrifugal pump component responsible for converting the mechanical energy of the liquid being pumped, to that of kinetic energy is the （）.A electric motorB voluteC impellerD diffusion nozzle

题目
单选题
The centrifugal pump component responsible for converting the mechanical energy of the liquid being pumped, to that of kinetic energy is the （）.
A

electric motor

B

volute

C

impeller

D

diffusion nozzle

相似考题

1.Throttling in the _____ line of a centrifugal pump involves the risk of the pump cavitation.A.suctionB.exhaustC.pressureD.discharge

2.A centrifugal pump may fail to deliver water when first started if the ______.A.water seal pipe is pluggedB.pump is not primedC.seal ring is properly locatedD.impeller is flooded

3.All of the following steps are taken in starting a centrifugal pump，EXCEPT to ______．A.Set the relief valveB.Check the lubrication systemC.Vent the pump casingD.Open the pump suction and discharge valves

4.If a centrifugal pump is driven by a constant speed electric motor and produces a discharge pressure less than designed, the cause is probably ______.A.excessive pump speedB.excessive suction headC.worn wearing ringsD.gross pump misalignment

参考答案和解析
正确答案： B
解析： 暂无解析
更多“The centrifugal pump component responsible for converting th”相关问题

  • 第1题：

    You start a centrifugal cargo pump to discharge cargo．The pump works for a while and then loses suction．This could be caused by ______．

    A.The pump running backwards

    B.Incomplete priming

    C.The discharge head being too high

    D.All of the above


    正确答案：B

  • 第2题：

    单选题
    Which of the following statements is correct with regards to the operation of a centrifugal cargo pump?（）
    A

    Oil is discharged from the impeller through the outlet

    B

    Gravity causes the oil to flow toward the discharge

    C

    The self-priming feature of the centrifugal pump enables it to draw its own suction as it starts

    D

    The discharge capacity varies directly with the speed of the impeller


    正确答案： C
    解析： 暂无解析

  • 第3题：

    单选题
    Reduced capacity, accompanied by vibration and noise at the suction of a centrifugal pump is a result of （）.
    A

    cavitation

    B

    water hammer

    C

    fluid friction

    D

    steam knock


    正确答案： A
    解析： 暂无解析

  • 第4题：

    单选题
    Pitting in the suction areas of a centrifugal pump bronze impeller is usually caused by （）.
    A

    cavitation

    B

    electrolysis

    C

    abrasion

    D

    corrosion


    正确答案： A
    解析： 暂无解析

  • 第5题：

    单选题
    All of the following steps are taken in starting a centrifugal pump，EXCEPT to（）.
    A

    set the relief valve

    B

    check the lubrication system

    C

    vent the pump casing

    D

    open the pump suction and discharge valves


    正确答案： C
    解析： 暂无解析

  • 第6题：

    单选题
    The capacity of a centrifugal pump can be increased by the installation of a larger diameter impeller Another means of increasing the pump capacity is to （）.
    A

    increase speed

    B

    increase the size of the cardent assembly

    C

    reduce wearing ring clearances

    D

    change the pump to a close coupled arrangement


    正确答案： A
    解析： 暂无解析

  • 第7题：

    单选题
    The centrifugal pump component responsible for converting the mechanical energy of the liquid being pumped, to that of kinetic energy is the （）.
    A

    electric motor

    B

    volute

    C

    impeller

    D

    diffusion nozzle


    正确答案： D
    解析： 暂无解析

  • 第8题：

    单选题
    The purpose of the wearing rings used in a centrifugal pump is to （）.
    A

    prevent an internal explosion in the pump when it is overheated

    B

    enable a visual inspection of the pump while it is running

    C

    insure a proper alignment of the pump coupling to the driver

    D

    accommodate for friction between the impeller and the easing


    正确答案： C
    解析： 暂无解析

  • 第9题：

    单选题
    The most suitable pump for oily water separator feed duties is （）.
    A

    a reciprocating pump

    B

    a vane pump

    C

    a centrifugal pump

    D

    a triple screw pump


    正确答案： C
    解析： 暂无解析

  • 第10题：

    单选题
    Which of the following pumps belongs to centrifugal pump?（）
    A

    Piston pump

    B

    Screw pump

    C

    Diffuser pump

    D

    Water-ring pump


    正确答案： B
    解析： 暂无解析

  • 第11题：

    单选题
    To maintain design discharge pressure from a centrifugal pump, the design clearance must be maintained between the （）.
    A

    shaft and impeller

    B

    motor and pump shaft

    C

    casing and impeller wearing rings

    D

    lantern ring and impeller


    正确答案： C
    解析： 暂无解析

  • 第12题：

    单选题
    On modern ships, centrifugal pump with a self-primer has replaced reciprocating pump as bilge pump because（）
    A

    centrifugal pump is cheaper than reciprocating pump

    B

    the size of centrifugal pump with same capacity is smaller than that of reciprocating pump

    C

    centrifugal pump makes maintenance easier than reciprocating pump does

    D

    all of the above


    正确答案： B
    解析： 暂无解析

  • 第13题：

    单选题
    With respect to centrifugal pump impellers, which of the following descriptions represents the correct centrifugal pump classification? （）
    A

    Single stage or multistage

    B

    High pressure or low pressure

    C

    Open or close coupled

    D

    Horizontal or vertical


    正确答案： C
    解析： 暂无解析

  • 第14题：

    单选题
    Which one is not the component of a typical, marine pattern self-contained unit?（）
    A

    a centrifugal fan

    B

    a direct expansion cooler

    C

    a hermetic compressor

    D

    a centrifugal pump


    正确答案： D
    解析： 暂无解析

  • 第15题：

    单选题
    Most pump manufacturers recommended that the discharge piping for centrifugal pumps be （）.
    A

    one size larger than the pump discharge nozzle

    B

    the same size as the pump discharge nozzle

    C

    one size smaller than the pump discharge nozzle

    D

    installed with a short radius elbow at the pump


    正确答案： C
    解析： 暂无解析

  • 第16题：

    单选题
    Increasing the speed of a centrifugal pump will result in an increase in its capacity Another means of increasing the capacity of a centrifugal pump is to increase the （）.
    A

    diameter of the discharge piping, with all other factors remaining the same

    B

    diameter of the suction piping, with all other factors remaining the same

    C

    width of the impeller only

    D

    diameter of the impeller


    正确答案： B
    解析： 暂无解析

  • 第17题：

    单选题
    One of the main functions of wearing rings, as used in a centrifugal pump, is to （）.
    A

    maintain radial alignment between the pump impeller and casing

    B

    absorb all impeller shaft end thrust

    C

    prevent water leakage to the atmosphere

    D

    prevent wear of the pump casing and/or impeller


    正确答案： D
    解析： 暂无解析

  • 第18题：

    单选题
    If a centrifugal pump is driven by a constant speed electric motor and produces a discharge pressure less than designed, the cause is probably（）.
    A

    excessive pump speed

    B

    excessive suction head

    C

    worn wearing rings

    D

    gross pump misalignment


    正确答案： D
    解析： 暂无解析

  • 第19题：

    单选题
    It is possible to mount a double suction centrifugal pump impeller with the vanes facing in the wrong directionThis would cause the pump （）.
    A

    head capacity to improve

    B

    discharge to be reversed

    C

    efficiency to decrease

    D

    slippage to decrease


    正确答案： C
    解析： 暂无解析

  • 第20题：

    单选题
    In order to properly remove air from the casing of a centrifugal pump when starting, the pump should have a （）.
    A

    positive head

    B

    negative suction head

    C

    mechanical seal

    D

    vent valve attached to the casing at the top of the volute


    正确答案： D
    解析： 暂无解析

  • 第21题：

    单选题
    Most pump manufacturers recommend that the suction piping dimension for centrifugal pumps be （）.
    A

    one size smaller than the pump suction nozzle

    B

    the same size as the pump suction nozzle

    C

    one size larger than the pump suction nozzle

    D

    installed with a short radius elbow at the pump


    正确答案： B
    解析： 暂无解析

  • 第22题：

    单选题
    A centrifugal pump produces the required pressure energy by means of a rotating （） provided with vanes.
    A

    propeller

    B

    impeller

    C

    circumference

    D

    screw


    正确答案： A
    解析： 暂无解析

  • 第23题：

    单选题
    When starting a centrifugal pump, the discharge valve should be （）.
    A

    closed

    B

    opened fully

    C

    cracked open

    D

    partly open


    正确答案： C
    解析： 暂无解析

  • 第24题：

    单选题
    The volute of centrifugal pump also acts as a diffuser converting （）into pressure head.
    A

    mechanical energy

    B

    heat energy

    C

    potential energy

    D

    kinetic head


    正确答案： B
    解析： 暂无解析

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