【单选题】【消耗次数:1】
不属于离心泵的操作步骤的是()。
盘车
开车
灌泵
停车
参考答案:
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相关题目
【单选题】 离心泵扬程的意义 。
①  A、泵的实际升扬高度
②  B、泵的吸液高度
③  C、液体出泵和进泵的压差换算成的液注高度
④  D、单位重量液体出泵和进泵的机械能差值
【单选题】 离心泵的工作点决定于 。
①  A、管路特性曲线
②  B、离心泵特性曲线
③  C、管路特性曲线和离心泵特性曲线
④  D、与管路特性曲线和离心泵特性曲线无关
【单选题】 启动离心泵前关闭泵出口阀的目的是( )。
①  提高泵出口压力
②  防止吸入管线突然抽空
③  防止系统压力突变
④  减小启动功率
【单选题】 倘若开大离心泵出口阀门,提高泵的输液量,会引起 。
①  A、泵的效率提高
②  B、泵的效率降低
③  C、泵的效率可能提高也可能降低
④  D、泵的效率只决定于泵的结构及泵的转速,与流量变化无关
【单选题】 离心泵过滤网安装在( )。
①  进口阀与泵之间
②  泵出口
③  进口阀之前
【单选题】 离心泵产生气缚的原因是( )。?
①  电机坏
②  叶轮损坏
③  流体在泵入口处气化
④  泵内有气体
【判断题】 化工生产中常见的几种离心泵是水泵、杂质泵、气泵。
①  正确
②  错误
【单选题】 离心泵的效率与流量的关系为——。
①  流量增加,效率增大。
②  流量增加,效率减小。
③  流量增加,效率先增大后减小。
④  流量增加,效率先减小后增大。
【单选题】 离心泵的轴功率与流量的关系——。
①  流量增大,轴功率增大。
②  流量增大,轴功率减小。
③  流量增大,轴功率先减小后增大。
④  流量增大,轴功率先增大后减小。
【单选题】 在某单泵输液的管路中,并联一台同一型号的离心泵,单泵与并联双泵的输液效果为————。
①  并联的输液量将是单泵的两倍
②  并联的扬程将是单泵的两倍
③  并联的能耗将是单泵的两倍
④  并联的输液量、扬程或能耗都不会是单泵的两倍
随机题目
【单选题】 Little ___ that we were watching his every move, so he seemed to be going his own way in this business.
①  he realized
②  ?he didn’t realize
③  ?didn’t he realize
④  ?did he realize
【单选题】 It is what you do rather than what you say ___ matters.
①  that
②  what
③  which
④  this
【单选题】 After dinner the minister made a short ___ to the guests.
①  delivery
②  pronunciation
③  conversation
④  speech
【单选题】 It was for this reason ___ her uncle moved out of New York and settled down in a small village.
①  which
②  why
③  that
④  how
【单选题】 The car salesman took the customer for a driver in the new model in order to ___ its improved features.
①  advocate
②  demonstrate
③  exhibit
④  reveal
【单选题】 I caught a___ of the car before it disappeared around the bend.
①  glance
②  glimpse
③  glare
④  stare
【单选题】 Alice ___her father that both she and her husband would be happy if he would live with them.
①  convinced
②  reinforced
③  pledged
④  required
【单选题】 Never in my wildest dreams ___ these people are living in such poor conditions.
①  I could imagine
②  ?could I imagine
③  ?I couldn’t imagine
④  ?couldn’t I imagine
【单选题】 It was ___ back home after the experiments.
①  not until midnight did he go
②  until midnight that he didn’t go
③  not until midnight that he went
④  until midnight when he didn’t go
【判断题】 Mark often attempts to excape to be fined whenever he breaks traffic regulations.
①  正确
②  错误