What is the function of wearing rings found on some centrifugal pumps ________．A.Absorb erosion of high velocity discharge streamB.Seal pump shaft against entry of airC.Isolate the outlet side from the inlet sideD.Dampen the turbulent discharge flow

题目

What is the function of wearing rings found on some centrifugal pumps ________．

A.Absorb erosion of high velocity discharge stream

B.Seal pump shaft against entry of air

C.Isolate the outlet side from the inlet side

D.Dampen the turbulent discharge flow

相似考题

1.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

2.What causes cavitation in a centrifugal pump ________．A.Vapor pockets in the flow streamB.Rough impeller surfacesC.Worn wearing ringsD.Heavy fluid in the flow stream

3.单选题If a centrifugal pump vibrates and is noisy when operating, the cause could be （）.A worn gland sealing shaftB worn wearing ringsC a bent shaftD reversed pump coupling

4.Centrifugal pumps have what advantage（s）over reciprocating pumps ________．A.They are less expensiveB.They are smaller for equivalent pumping abilityC.They pump more cargo in less timeD.All of the above

更多“What is the function of wearing rings found on some centrifugal pumps ________.A.Absorb er ”相关问题

  • 第1题：

    单选题
    What is the function of wearing rings found on some centrifugal pumps? （）
    A

    Absorb erosion of high velocity discharge stream

    B

    Seal pump shaft against entry of air

    C

    Isolate the outlet side from the inlet side

    D

    Dampen the turbulent discharge flow


    正确答案： B
    解析： 暂无解析

  • 第2题：

    单选题
    Scuffed cylinder liner wearing surfaces in a diesel engines can result from （）
    A

    starting the engine while hot

    B

    knurling the piston skirt

    C

    operating the engine overheated

    D

    scuff resistant piston rings


    正确答案： D
    解析： 暂无解析

  • 第3题：

    单选题
    What is a characteristic of all centrifugal cargo pumps? （）
    A

    They are self-priming

    B

    Decreasing the speed of rotation will decrease the discharge pressure

    C

    Opening the discharge valve wider will increase the discharge pressure

    D

    All of the above


    正确答案： C
    解析： 暂无解析

  • 第4题：

    单选题
    Centrifugal pumps have what advantage(s) over reciprocating pumps?（）.
    A

    They are less expensive

    B

    They are smaller for equivalent pumping ability

    C

    They pump more cargo in less time

    D

    All of the above


    正确答案： D
    解析： 暂无解析

  • 第5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6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7题：

    单选题
    Lube oil pumps taking suction from the sump of most small marine engines are usually （）.
    A

    of the diaphragm type

    B

    of the centrifugal type

    C

    of the positive displacement type

    D

    independently driven by electric motors


    正确答案： D
    解析： 暂无解析

  • 第8题：

    单选题
    The piston rings if found worn out （） and supplied by shipchandler.
    A

    must replace

    B

    must to be equipped

    C

    has to be repaired

    D

    have to be renewed


    正确答案： A
    解析： 暂无解析

  • 第9题：

    单选题
    When installed for bilge pumping or ballast duty, centrifugal pumps require a （） to remove air from the suction pipe.
    A

    air chamber

    B

    head lank

    C

    primer

    D

    prime mover


    正确答案： D
    解析： 暂无解析

  • 第10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11题：

    单选题
    Which features of a centrifugal pump reduce the need for renewing worn impellers and pump casings?（）
    A

    Close radial clearance between impeller hub and casing

    B

    Low rotational speed of impeller

    C

    Removable end plate

    D

    Replaceable impeller and casing wearing rings


    正确答案： C
    解析： 暂无解析

  • 第12题：

    单选题
    Which of the listed conditions can lead to cavitation气穴in a centrifugal pump?（）
    A

    Vapor pockets formed in the suction flow stream

    B

    Rough easing volute surfaces

    C

    Worn wearing rings

    D

    Heavy fluid in the flow stream


    正确答案： D
    解析： 暂无解析

  • 第13题：

    单选题
    What is a function of the wearing rings used in most centrifugal pumps?（）
    A

    Absorb erosion of high velocity discharge stream

    B

    Seal pump shaft against entry of air

    C

    Isolate the discharge side from the suction side

    D

    Dampen the turbulent discharge flow


    正确答案： C
    解析： 暂无解析

  • 第14题：

    单选题
    The pumps employed on board ship can be divided into two main categories ie（） pumps and centrifugal pumps.
    A

    gear

    B

    nonpositive displacement

    C

    positive displacement

    D

    rotary


    正确答案： A
    解析： 暂无解析

  • 第15题：

    单选题
    What function is provided by the crankcase ventilation system on some diesel engines?（）
    A

    Increases the sludge forming tendency of lube oil

    B

    Prevents the accumulation of combustible gases

    C

    Improves lube oil cooling

    D

    Improves cold weather starting


    正确答案： A
    解析： 暂无解析

  • 第16题：

    单选题
    Under centrifugal pumps are the volute, diffuser, mixed-flow, axial flow and （） or regenerative types.
    A

    reciprocating

    B

    hydraulic

    C

    turbine

    D

    vane


    正确答案： D
    解析： 暂无解析

  • 第17题：

    单选题
    If you were operating a centrifugal water service pump with worn wearing rings, the （）.
    A

    pump would be very noisy

    B

    pump would vibrate excessively

    C

    pump would develop insufficient flow

    D

    stuffing box would leak excessively


    正确答案： A
    解析： 暂无解析

  • 第18题：

    单选题
    To absorb the wear resulting from impeller rotation and abrasives in the liquid, a centrifugal pump is usually fitted with （）.
    A

    lantern rings

    B

    bearings

    C

    easing volutes

    D

    wearing rings


    正确答案： D
    解析： 暂无解析

  • 第19题：

    单选题
    If the capacity of a centrifugal pump decreases gradually over a long period of time, you should replace the （）.
    A

    packing gland

    B

    mechanical seals

    C

    lantern rings

    D

    wearing rings


    正确答案： A
    解析： 暂无解析

  • 第20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21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22题：

    单选题
    Which of the materials listed is used as the dynamic seal material on mechanical seals installed on most centrifugal pumps used in water service?（）
    A

    Copper

    B

    Copper and carbon

    C

    Carbon

    D

    Bronze


    正确答案： A
    解析： 暂无解析

  • 第23题：

    单选题
    Centrifugal pumps, however, can be designed with a number of impellers （） to attain a large amount of liquid.
    A

    in series

    B

    in parallel

    C

    assembled

    D

    together


    正确答案： C
    解析： 暂无解析

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