单选题With respect to centrifugal pump impellers, which of the following descriptions represents the correct centrifugal pump classification? （）A Single stage or multistageB High pressure or low pressureC Open or close coupledD Horizontal or vertical

题目
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

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.Which pump must always be primed ________．A.Centrifugal pumpB.Reciprocating pumpC.Rotary pumpD.All of the above

3.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 outletB Gravity causes the oil to flow toward the dischargeC The self-priming feature of the centrifugal pump enables it to draw its own suction as it startsD The discharge capacity varies directly with the speed of the impeller

4.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

参考答案和解析
正确答案： C
解析： 暂无解析
更多“With respect to centrifugal pump impellers, which of the fol”相关问题

  • 第1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2题：

    单选题
    Which of the following will be the advantage of a centrifugal pump as compared with a reciprocating pump?（） (1) Its discharge is continuous (2) It has no internal valves (3) Upon accidental closing of discharge valve, excessive pressure will not build up
    A

    （1），（2）

    B

    （2），（3）

    C

    （1），（2），（3）

    D

    （2）only


    正确答案： B
    解析： 暂无解析

  • 第3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4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
    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7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8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9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10题：

    单选题
    Centrifugal pumps can be designed with a number of impellers （） to attain a high final delivery pressure.
    A

    in series

    B

    in parallel

    C

    either A or B

    D

    None of the above is tree


    正确答案： B
    解析： 暂无解析

  • 第11题：

    单选题
    Which of the following actions should be taken if during a routine maintenance inspection of a centrifugal pump, localized scoring on a pump shaft sleeve is detected?（）
    A

    Correct the cause of the scoring and repair the sleeve or replace with a new one

    B

    Reassemble the unit and provide more water leak off for proper lubrication

    C

    Check for parallel alignment of the sleeve radial faces to the sleeve bores

    D

    Reassemble the unit and adjust the governor to obtain a slower speed


    正确答案： C
    解析： 暂无解析

  • 第12题：

    单选题
    Which of the following centrifugal pump components converts the liquid kinetic energy of velocity to the potential energy of pressure?（）
    A

    Impeller

    B

    Electric motor

    C

    Volute

    D

    Eye


    正确答案： C
    解析： 暂无解析

  • 第13题：

    单选题
    A multistage centrifugal pump can be BEST described as having （）.
    A

    two or more impellers housed together in one casing and mounted on a single shaft

    B

    a single stepped impeller mounted in a progressively staged casing

    C

    a large radial clearance between the impeller and casing to prevent overheating due to

    D

    an increase in the discharge velocity of the liquid with a corresponding decrease in pressure through the stages


    正确答案： D
    解析： 暂无解析

  • 第14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15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16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17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18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19题：

    单选题
    Excessive air leakage into the suction side of a centrifugal pump would be indicated by which of the following operational problems?（）
    A

    The pump delivers full capacity when started, but gradually slackens off toan abnormally low flow

    B

    The pump packing gland overheats after short operating periods

    C

    The motor over-current protective device continually shuts the pump down

    D

    Pounding noises can be heard at the pump suction chest


    正确答案： B
    解析： 暂无解析

  • 第20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21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

  • 第22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23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

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