化工总控工培训理论部分试题及答案- vcm备用

武享吧 08/06/201423:28:50赛事预告68K 次浏览2阅读模式

51.与液体相比,输送相同质量流量的气体,气体输送机械的(  B  )。文章源自武享吧-https://www.hula8.net/article/6365.html

A.体积较小    B.压头相应也更高     C.结构设计更简单    D.效率更高文章源自武享吧-https://www.hula8.net/article/6365.html

52.离心泵性能曲线中的扬程流量线是在(  C  )一定的情况下测定的。文章源自武享吧-https://www.hula8.net/article/6365.html

A.效率一定    B.功率一定    C.转速一定    D.管路布置一定文章源自武享吧-https://www.hula8.net/article/6365.html

53.离心泵在液面之下,启动后不出水的原因可能是(  A  )。文章源自武享吧-https://www.hula8.net/article/6365.html

A.吸入管阀卡    B.填料压得过紧    C.泵内发生汽蚀现象   D.轴承润滑不良文章源自武享吧-https://www.hula8.net/article/6365.html

54.一台离心泵开动不久,泵入口处的真空度正常,泵出口处的压力表也逐渐降低为零,此时离心泵完全打不出水。发生故障的原因是(  B  )。文章源自武享吧-https://www.hula8.net/article/6365.html

A.忘了灌水    B.吸入管路堵塞    C.压出管路堵塞    D.吸入管路漏气文章源自武享吧-https://www.hula8.net/article/6365.html

55.离心泵在正常运转时,其扬程与升扬高度的大小比较是(  A  )。文章源自武享吧-https://www.hula8.net/article/6365.html

A.扬程>升扬高度   B.扬程=升扬高度   C.扬程<升扬高度   D.不能确定文章源自武享吧-https://www.hula8.net/article/6365.html

56.对于压缩气体属于易燃易爆性质时,在启动往复式压缩机前,应该采用( A )将缸内、管路和附属容器内的空气或其他非工作介质置换干净,并达到合格标准,杜绝爆炸和设备事故的发生。文章源自武享吧-https://www.hula8.net/article/6365.html

A.氮气    B.氧气   C.水蒸气    D.过热蒸汽文章源自武享吧-https://www.hula8.net/article/6365.html

57.透平式压缩机属于(   B  )压缩机。文章源自武享吧-https://www.hula8.net/article/6365.html

A.往复式    B.离心式    C.轴流式    D.流体作用式文章源自武享吧-https://www.hula8.net/article/6365.html

58.通风机日常维护保养要求做到(  D  )。文章源自武享吧-https://www.hula8.net/article/6365.html

A.保持轴承润滑良好,温度不超过65℃    B.保持冷却水畅通,出水温度不超过35℃文章源自武享吧-https://www.hula8.net/article/6365.html

C.注意风机有无杂音、振动、地脚螺栓和紧固件是否松动,保持设备清洁,零部件齐全文章源自武享吧-https://www.hula8.net/article/6365.html

D.以上三种要求文章源自武享吧-https://www.hula8.net/article/6365.html

59.在使用往复泵时,发现流量不足,其产生的原因是(   D  )。文章源自武享吧-https://www.hula8.net/article/6365.html

A.进出口滑阀不严、弹簧损坏    B.过滤器堵塞或缸内有气体文章源自武享吧-https://www.hula8.net/article/6365.html

C.往复次数减少                D.以上三种原因文章源自武享吧-https://www.hula8.net/article/6365.html

60.下列几种叶轮中,(  C  )叶轮效率最高。文章源自武享吧-https://www.hula8.net/article/6365.html

A.开式    B.半开式    C.闭式    D.桨式文章源自武享吧-https://www.hula8.net/article/6365.html

61.离心泵的工作原理是利用叶轮高速运转产生的(   C  )。文章源自武享吧-https://www.hula8.net/article/6365.html

A.向心力    B.重力    C.离心力    D.拉力文章源自武享吧-https://www.hula8.net/article/6365.html

62.液体的液封高度的确定是根据(  C  )。文章源自武享吧-https://www.hula8.net/article/6365.html

A.连续性方程    B.物料衡算式    C.静力学方程    D.牛顿黏性定律文章源自武享吧-https://www.hula8.net/article/6365.html

63.离心泵送液体的黏度越大,则有(   D  )。文章源自武享吧-https://www.hula8.net/article/6365.html

A.泵的扬程越大    B.流量越大    C.效率越大    D.轴功率越大文章源自武享吧-https://www.hula8.net/article/6365.html

64.选离心泵是根据泵的(  A  )。文章源自武享吧-https://www.hula8.net/article/6365.html

A.扬程和流量选择        B.轴功率和流量选择文章源自武享吧-https://www.hula8.net/article/6365.html

C.扬程和轴功率选择      D.转速和轴功率选择文章源自武享吧-https://www.hula8.net/article/6365.html

65.齿轮泵的工作原理是(   D  )。文章源自武享吧-https://www.hula8.net/article/6365.html

A.利用离心力的作用输送流体          B.依靠重力作用输送流体文章源自武享吧-https://www.hula8.net/article/6365.html

C.依靠另外一种流体的能量输送流体    D.利用工作室容积的变化输送流体文章源自武享吧-https://www.hula8.net/article/6365.html

66.哪种泵特别适用于输送腐蚀性强、易燃、易爆、剧毒、有放射性以及极为贵重的液文章源自武享吧-https://www.hula8.net/article/6365.html

体。(   B  )文章源自武享吧-https://www.hula8.net/article/6365.html

A.离心泵    B.屏蔽泵    C.液下泵    D.耐腐蚀泵文章源自武享吧-https://www.hula8.net/article/6365.html

67.下列四种阀门,通常情况下最适合流量调节的阀门是(  A  )。文章源自武享吧-https://www.hula8.net/article/6365.html

A.截止阀    B.闸阀    C.考克阀    D.蝶阀文章源自武享吧-https://www.hula8.net/article/6365.html

68.下列四种流量计,哪种不属于差压式流量计的是(   D  )。文章源自武享吧-https://www.hula8.net/article/6365.html

A.孔板流量计    B.喷嘴流量计    C.文丘里流量计    D.转子流量计文章源自武享吧-https://www.hula8.net/article/6365.html

69.启动往复泵前其出口阀必须(  B  )。文章源自武享吧-https://www.hula8.net/article/6365.html

A.关闭    B.打开    C.微开    D.无所谓文章源自武享吧-https://www.hula8.net/article/6365.html

70.齿轮泵的流量调节可采用(  C  )。文章源自武享吧-https://www.hula8.net/article/6365.html

A.进口阀    B.出口阀    C.旁路阀    D.都可以文章源自武享吧-https://www.hula8.net/article/6365.html

71.与降尘室的生产能力无关的是(  C  )。文章源自武享吧-https://www.hula8.net/article/6365.html

A.降尘室的长    B.降尘室的宽    C.降尘室的高    D.颗粒的沉降速度文章源自武享吧-https://www.hula8.net/article/6365.html

72.下列用来分离气-固非均相物系的是(  C  )。文章源自武享吧-https://www.hula8.net/article/6365.html

A.板框压滤机    B.转筒真空过滤机    C.袋滤器    D.三足式离心机文章源自武享吧-https://www.hula8.net/article/6365.html

73.微粒在降尘室内能除去的条件为:停留时间(  B  )它的尘降时间。文章源自武享吧-https://www.hula8.net/article/6365.html

A.不等于    B.大于或等于    C.小于    D.大于或小于文章源自武享吧-https://www.hula8.net/article/6365.html

74.有一高温含尘气流,尘粒的平均直径在2~3μm,现要达到较好的除尘效果,可采用文章源自武享吧-https://www.hula8.net/article/6365.html

(  D  )。文章源自武享吧-https://www.hula8.net/article/6365.html

A.降尘室    B.旋风分离器    C.湿法除尘    D.袋滤器文章源自武享吧-https://www.hula8.net/article/6365.html

75.过滤操作中滤液流动遇到阻力是(  C  )。文章源自武享吧-https://www.hula8.net/article/6365.html

A.过滤介质阻力    B.滤饼阻力     C.过滤介质和滤饼阻力之和    D.无法确定文章源自武享吧-https://www.hula8.net/article/6365.html

76.旋风分离器主要是利用(  B  )的作用使颗粒沉降而达到分离。文章源自武享吧-https://www.hula8.net/article/6365.html

A.重力    B.惯性离心力    C.静电场    D.重力和惯性离心力文章源自武享吧-https://www.hula8.net/article/6365.html

77.旋风分离器的进气口宽度B值增大,其临界直径(  B  )。文章源自武享吧-https://www.hula8.net/article/6365.html

A.减小    B.增大    C.不变    D.不能确定文章源自武享吧-https://www.hula8.net/article/6365.html

78.过滤速率与(   B  )成反比。文章源自武享吧-https://www.hula8.net/article/6365.html

A.操作压差和滤液黏度     B.滤液黏度和滤渣厚度文章源自武享吧-https://www.hula8.net/article/6365.html

C.滤渣厚度和颗粒直径     D.颗粒直径和操作压差文章源自武享吧-https://www.hula8.net/article/6365.html

79.下列措施中不一定能有效地提高过滤速率的是(   B  )。文章源自武享吧-https://www.hula8.net/article/6365.html

A.加热滤浆   B.在过滤介质上游加压   C.在过滤介质下游抽真空   D.及时卸渣文章源自武享吧-https://www.hula8.net/article/6365.html

80.在①旋风分离器、②降尘室、③袋滤器、④静电除尘器等除尘设备中,能除去气体文章源自武享吧-https://www.hula8.net/article/6365.html

中颗粒的直径符合由大到小的顺序的是(  C  )。文章源自武享吧-https://www.hula8.net/article/6365.html

A.①②③④    B.④③①②    C.②①③④    D.②①④③文章源自武享吧-https://www.hula8.net/article/6365.html

81.以下表达式中正确的是(  A  )。文章源自武享吧-https://www.hula8.net/article/6365.html

A.过滤速率与过滤面积平方A2成正比     B.过滤速率与过滤面积A成正比文章源自武享吧-https://www.hula8.net/article/6365.html

C.过滤速率与所得滤液体积V成正比      D.过滤速率与虚拟滤液体积Ve成反比文章源自武享吧-https://www.hula8.net/article/6365.html

82.自由沉降的意思是(  D  )。文章源自武享吧-https://www.hula8.net/article/6365.html

A.颗粒在沉降过程中受到的流体阻力可忽略不计文章源自武享吧-https://www.hula8.net/article/6365.html

B.颗粒开始的降落速度为零,没有附加一个初始速度文章源自武享吧-https://www.hula8.net/article/6365.html

C.颗粒在降落的方向上只受重力作用,没有离心力等的作用文章源自武享吧-https://www.hula8.net/article/6365.html

D.颗粒间不发生碰撞或接触的情况下的沉降过程文章源自武享吧-https://www.hula8.net/article/6365.html

83.“在一般过滤操作中,实际上起到主要介质作用的是滤饼层而不是过滤介质本身”;文章源自武享吧-https://www.hula8.net/article/6365.html

“滤渣就是滤饼”,则(  C  )。文章源自武享吧-https://www.hula8.net/article/6365.html

A.这两种说法都对          B.两种说法都不对文章源自武享吧-https://www.hula8.net/article/6365.html

C.只有第一种说法正确      D.只有第二种说法正确文章源自武享吧-https://www.hula8.net/article/6365.html

84.下列哪一个分离过程不属于非均相物系的分离过程。(  B  )文章源自武享吧-https://www.hula8.net/article/6365.html

A.沉降    B.结晶    C.过滤    D.离心分离文章源自武享吧-https://www.hula8.net/article/6365.html

85.推导过滤基本方程时,一个基本的假设是(  D  )。文章源自武享吧-https://www.hula8.net/article/6365.html

A.滤液在介质中呈湍流流动     B.滤液在介质中呈层流流动文章源自武享吧-https://www.hula8.net/article/6365.html

C.滤液在滤渣中呈湍流流动     D.滤液在滤渣中呈层流流动文章源自武享吧-https://www.hula8.net/article/6365.html

86.在重力场中,微小颗粒的沉降速度与(   D  )无关。文章源自武享吧-https://www.hula8.net/article/6365.html

A.粒子的几何形状   B.粒子的尺寸大小   C.流体与粒子的密度   D.流体的速度文章源自武享吧-https://www.hula8.net/article/6365.html

87.欲提高降尘室的生产能力,主要的措施是(  C  )。文章源自武享吧-https://www.hula8.net/article/6365.html

A.提高降尘室的高度    B.延长沉降时问    C.增大沉降面积    D.都可以文章源自武享吧-https://www.hula8.net/article/6365.html

88.下列物系中,不可以用旋风分离器加以分离的是(   C  )。文章源自武享吧-https://www.hula8.net/article/6365.html

A.悬浮液    B.含尘气体    C.酒精水溶液    D.乳浊液文章源自武享吧-https://www.hula8.net/article/6365.html

89.在讨论旋风分离器分离性能时,临界直径这一术语是指(   C  )。文章源自武享吧-https://www.hula8.net/article/6365.html

A.旋风分离器效率最高时的旋风分离器的直径文章源自武享吧-https://www.hula8.net/article/6365.html

B.旋风分离器允许的最小直径文章源自武享吧-https://www.hula8.net/article/6365.html

C.旋风分离器能够全部分离出来的最小颗粒的直径文章源自武享吧-https://www.hula8.net/article/6365.html

D.能保持滞流流型时的最大颗粒直径。文章源自武享吧-https://www.hula8.net/article/6365.html

90.以下过滤机是连续式过滤机的是(  C  )。文章源自武享吧-https://www.hula8.net/article/6365.html

A.箱式叶滤机    B.真空叶滤机    C.回转真空过滤机    D.板框压滤机文章源自武享吧-https://www.hula8.net/article/6365.html

91.当其他条件不变时,提高回转真空过滤机的转速,则过滤机的生产能力(  A  )。文章源自武享吧-https://www.hula8.net/article/6365.html

A.提高    B.降低    C.不变    D.不一定文章源自武享吧-https://www.hula8.net/article/6365.html

92.下列用来分离气-固非均相物系的是(  C  )。文章源自武享吧-https://www.hula8.net/article/6365.html

A.板框压滤机    B.转筒真空过滤机     C.袋滤器    D.三足式离心机文章源自武享吧-https://www.hula8.net/article/6365.html

93.如果气体处理量较大,可以采取两个以上尺寸较小的旋风分离器(  B  )使用。文章源自武享吧-https://www.hula8.net/article/6365.html

A.串联    B.并联    C.先串联后并联    D.先并联后串联文章源自武享吧-https://www.hula8.net/article/6365.html

94.多层降尘室是根据(   B   )原理而设计的。文章源自武享吧-https://www.hula8.net/article/6365.html

A.含尘气体处理量与降尘室的层数无关    B.含尘气体处理量与降尘室的高度无关文章源自武享吧-https://www.hula8.net/article/6365.html

C.含尘气体处理量与降尘室的直径无关    D.含尘气体处理量与降尘室的大小无关文章源自武享吧-https://www.hula8.net/article/6365.html

95.现有一乳浊液要进行分离操作,可采用(  C  )。文章源自武享吧-https://www.hula8.net/article/6365.html

A.沉降器    B.三足式离心机    C.碟式离心机    D.板框过滤机文章源自武享吧-https://www.hula8.net/article/6365.html

注:一种专门用来分离乳状液或乳浊液的分离设备,立式转鼓内装有多片类似蝶形的圆盘而得名。文章源自武享吧-https://www.hula8.net/article/6365.html

96.下列不能提高对流传热膜系数的是(  B  )。文章源自武享吧-https://www.hula8.net/article/6365.html

A.利用多管程结构        B.增大管径文章源自武享吧-https://www.hula8.net/article/6365.html

C.在壳程内装折流挡板    D.冷凝时在管壁上开一些纵槽文章源自武享吧-https://www.hula8.net/article/6365.html

97.用潜热法计算流体间的传热量(  B   )。文章源自武享吧-https://www.hula8.net/article/6365.html

A.仅适用于相态不变而温度变化的情况    B.仅适用于温度不变而相态变化的情况文章源自武享吧-https://www.hula8.net/article/6365.html

C.仅适用于既有相变化,又有温度变化的情况      D.以上均错文章源自武享吧-https://www.hula8.net/article/6365.html

98.用水蒸气在列管换热器中加热某盐溶液,水蒸气走壳程。为强化传热,下列措施中最为经济有效的是(  C  )。文章源自武享吧-https://www.hula8.net/article/6365.html

A.增大换热器尺寸以增大传热面积    B.在壳程设置折流挡板文章源自武享吧-https://www.hula8.net/article/6365.html

C.改单管程为双管程                D.减少传热壁面厚度文章源自武享吧-https://www.hula8.net/article/6365.html

99.可在器内设置搅拌器的是(   C  )换热器。文章源自武享吧-https://www.hula8.net/article/6365.html

A.套管    B.釜式    C.夹套    D.热管文章源自武享吧-https://www.hula8.net/article/6365.html

100.列管换热器中下列流体宜走壳程的是(  D  )。文章源自武享吧-https://www.hula8.net/article/6365.html

A.不洁净或易结垢的流体  B.腐蚀性的流体   C.压力高的流体   D.被冷却的流体文章源自武享吧-https://www.hula8.net/article/6365.html

101.夏天电风扇之所以能解热是因为(   B  )。文章源自武享吧-https://www.hula8.net/article/6365.html

A.它降低了环境温度     B.产生强制对流带走了人体表面的热量文章源自武享吧-https://www.hula8.net/article/6365.html

C.增强了自然对流       D.产生了导热文章源自武享吧-https://www.hula8.net/article/6365.html

102.有一种30℃流体需加热到80℃,下列三种热流体的热量都能满足要求,应选(  D  )文章源自武享吧-https://www.hula8.net/article/6365.html

有利于节能。文章源自武享吧-https://www.hula8.net/article/6365.html

A.400℃的蒸汽    B.300℃的蒸汽    C.200℃的蒸汽    D.150℃的热流体文章源自武享吧-https://www.hula8.net/article/6365.html

103.在管壳式换热器中,用饱和蒸汽冷凝以加热空气,下面两项判断为(  A  )。甲:文章源自武享吧-https://www.hula8.net/article/6365.html

传热管壁温度接近加热蒸汽温度。乙:总传热系数接近于空气侧的对流传热系数。文章源自武享吧-https://www.hula8.net/article/6365.html

A.甲、乙均合理  B.甲、乙均不合理  C.甲合理、乙不合理  D.甲不合理、乙合理文章源自武享吧-https://www.hula8.net/article/6365.html

104.在稳定变温传热中,流体的流向选择(   B  )时,传热平均温差最大。文章源自武享吧-https://www.hula8.net/article/6365.html

A.并流    B.逆流    C.错流    D.折流文章源自武享吧-https://www.hula8.net/article/6365.html

105.下列哪一种不属于列管式换热器(   C  )。文章源自武享吧-https://www.hula8.net/article/6365.html

A.U形管式    B.浮头式    C.螺旋板式    D.固定管板式文章源自武享吧-https://www.hula8.net/article/6365.html

106.下列不属于强化传热的方法的是(  D   )。文章源自武享吧-https://www.hula8.net/article/6365.html

A.加大传热面积    B.加大传热温度差   C.加大流速    D.加装保温层文章源自武享吧-https://www.hula8.net/article/6365.html

107.空气、水、金属固体的热导率(导热系数)分别为λ1、λ2、λ3,其大小顺序正确的文章源自武享吧-https://www.hula8.net/article/6365.html

是(   B  )。文章源自武享吧-https://www.hula8.net/article/6365.html

A.λ1>λ2>λ3    B.λ1<λ2<λ3   C.λ2>λ3>λ1    D.λ3<λ2<λ1文章源自武享吧-https://www.hula8.net/article/6365.html

108.翅片管换热器的翅片应安装在(  A   )。文章源自武享吧-https://www.hula8.net/article/6365.html

A.a小的一侧    B.a大的一侧    C.管内    D.管外文章源自武享吧-https://www.hula8.net/article/6365.html

109.工业采用翅片状的暖气管代替圆钢管,其目的是(  D  )。文章源自武享吧-https://www.hula8.net/article/6365.html

A.增加热阻,减少热量损失      B.节约钢材文章源自武享吧-https://www.hula8.net/article/6365.html

C.增强美观                    D.增加传热面积,提高传热效果文章源自武享吧-https://www.hula8.net/article/6365.html

110.冷、热流体在换热器中进行无相变逆流传热,换热器用久后形成污垢层,在同样的操作条件下,与无垢层相比,结垢后的换热器的K(   B   )。文章源自武享吧-https://www.hula8.net/article/6365.html

A.变大    B.变小    C.不变    D.不确定文章源自武享吧-https://www.hula8.net/article/6365.html

111.管壳式换热器启动时,首先通入的流体是(  C  )。文章源自武享吧-https://www.hula8.net/article/6365.html

A.热流体    B.冷流体    C.最接近环境温度的流体    D.任意文章源自武享吧-https://www.hula8.net/article/6365.html

112.换热器中冷物料出口温度升高,可能引起的原因有多个,除了(   B  )。文章源自武享吧-https://www.hula8.net/article/6365.html

A.冷物料流量下降          B.热物料流量下降文章源自武享吧-https://www.hula8.net/article/6365.html

C.热物料进口温度升高      D.冷物料进口温度升高文章源自武享吧-https://www.hula8.net/article/6365.html

113.在一单程列管换热器中,用l00℃的热水加热一种易生垢的有机液体,这种液体超过80℃时易分解。试确定有机液体的通入空间及流向(   A   )。文章源自武享吧-https://www.hula8.net/article/6365.html

A.走管程,并流    B.走壳程,并流    C.走管程,逆流    D.走壳程,逆流文章源自武享吧-https://www.hula8.net/article/6365.html

114.为了减少室外设备的热损失,保温层外包的一层金属皮应采用(  A  )。文章源自武享吧-https://www.hula8.net/article/6365.html

A.表面光滑,色泽较浅      B.表面粗糙,色泽较深文章源自武享吧-https://www.hula8.net/article/6365.html

C.表面粗糙,色泽较浅      D.以上都不是文章源自武享吧-https://www.hula8.net/article/6365.html

115.为了在某固定空间造成充分的自然对流,有下面两种说法:①加热器应置于该空间文章源自武享吧-https://www.hula8.net/article/6365.html

的上部;②冷凝器应置于该空间的下部。正确的结论应该是(   B  )。文章源自武享吧-https://www.hula8.net/article/6365.html

A.这两种说法都对                    B.这两种说法都不对文章源自武享吧-https://www.hula8.net/article/6365.html

C.第一种说法对,第二种说法不对      D.第一种说法不对,第二种说法对文章源自武享吧-https://www.hula8.net/article/6365.html

116.利用水在逆流操作的套管换热器中冷却某物料。要求热流体的进出口温度及流量不文章源自武享吧-https://www.hula8.net/article/6365.html

变。今因冷却水进口温度升高,为保证完成生产任务,提高冷却水的流量,其结果使文章源自武享吧-https://www.hula8.net/article/6365.html

Δtm(  B  )。文章源自武享吧-https://www.hula8.net/article/6365.html

A.增大    B.下降    C.不变    D.不确定文章源自武享吧-https://www.hula8.net/article/6365.html

117.列管换热器的传热效率下降可能是由于(  A  )。文章源自武享吧-https://www.hula8.net/article/6365.html

A.壳体内不凝汽或冷凝液增多      B.壳体介质流动过快文章源自武享吧-https://www.hula8.net/article/6365.html

C.管束与折流板的结构不合        D.壳体和管束温差过大文章源自武享吧-https://www.hula8.net/article/6365.html

118.对间壁两侧流体一侧恒温、另一侧变温的传热过程,逆流和并流时Δtm。的大小为文章源自武享吧-https://www.hula8.net/article/6365.html

(  C  )。文章源自武享吧-https://www.hula8.net/article/6365.html

A.Δtm逆>Δtm并     B.Δtm逆<Δtm并     C.Δtm逆=Δtm并    D.不确定文章源自武享吧-https://www.hula8.net/article/6365.html

119.对流传热速率等于系数×推动力,其中推动力是(  B   )。文章源自武享吧-https://www.hula8.net/article/6365.html

A.两流体的温度差         B.流体温度和壁温度差文章源自武享吧-https://www.hula8.net/article/6365.html

C.同一流体的温度差       D.两流体的速度差文章源自武享吧-https://www.hula8.net/article/6365.html

120.在管壳式换热器中,不洁净和易结垢的流体宜走管内,因为管内(  A  )。文章源自武享吧-https://www.hula8.net/article/6365.html

A.清洗比较方便     B.流速较快     C.流通面积小    D.易于传热文章源自武享吧-https://www.hula8.net/article/6365.html

121.在管壳式换热器中,被冷却的流体宜走管间,可利用外壳向外的散热作用(  A  )。文章源自武享吧-https://www.hula8.net/article/6365.html

A.以增强冷却效果    B.以免流速过快   C.以免流通面积过小   D.以免传热过多文章源自武享吧-https://www.hula8.net/article/6365.html

122.在管壳式换热器中安装折流挡板的目的,是为了加大壳程流体的(  C  )使湍动程度加剧,以提高壳程对流传热系数。文章源自武享吧-https://www.hula8.net/article/6365.html

A.黏度    B.密度    C.速度    D.高度文章源自武享吧-https://www.hula8.net/article/6365.html

123.辐射和热传导、对流方式传递热量的根本区别是(   A  )。文章源自武享吧-https://www.hula8.net/article/6365.html

A.有无传递介质    B.物体是否运动     C.物体内分子是否运动    D.全部正确文章源自武享吧-https://www.hula8.net/article/6365.html

124.下列哪个选项不是列管换热器的主要构成部件。(   B  )文章源自武享吧-https://www.hula8.net/article/6365.html

A.外壳    B.蛇管    C.管束    D.封头文章源自武享吧-https://www.hula8.net/article/6365.html

125.蛇管式换热器的优点是(   A  )。文章源自武享吧-https://www.hula8.net/article/6365.html

A.传热膜系数大   B.平均传热温度差大   C.传热速率大   D.传热速率变化不大文章源自武享吧-https://www.hula8.net/article/6365.html

126.套管冷凝器的内管走空气,管间走饱和水蒸气,如果蒸汽压力一定,空气进口温度文章源自武享吧-https://www.hula8.net/article/6365.html

一定,当空气流量增加时传热系数K应(  A  )。文章源自武享吧-https://www.hula8.net/article/6365.html

A.增大    B.减小    C.基本不变    D.无法判断文章源自武享吧-https://www.hula8.net/article/6365.html

127.套管冷凝器的内管走空气,管间走饱和水蒸气,如果蒸汽压力一定,空气进口温度一定,当空气流量增加时空气出口温度(   B  )。文章源自武享吧-https://www.hula8.net/article/6365.html

A.增大    B.减小    C.基本不变    D.无法判断文章源自武享吧-https://www.hula8.net/article/6365.html

128.要求热流体从300℃降到200℃,冷流体从50℃升高到260℃,宜采用(  A   )换热。文章源自武享吧-https://www.hula8.net/article/6365.html

A.逆流    B.并流    C.并流或逆流    D.以上都不正确文章源自武享吧-https://www.hula8.net/article/6365.html

129.对于间壁式换热器,流体的流动速度增加,其热交换能力将(   C  )。文章源自武享吧-https://www.hula8.net/article/6365.html

A.减小    B.不变    C.增加    D.不能确定文章源自武享吧-https://www.hula8.net/article/6365.html

130.蒸汽中不凝性气体的存在,会使它的对流传热系数a值(  A   )。文章源自武享吧-https://www.hula8.net/article/6365.html

A.降低    B.升高    C.不变    D.都可能文章源自武享吧-https://www.hula8.net/article/6365.html

131.在卧式列管换热器中,用常压饱和蒸汽对空气进行加热(冷凝液在饱和温度下排文章源自武享吧-https://www.hula8.net/article/6365.html

出),饱和蒸汽应走(   B  ),蒸汽流动方向(  B   )。文章源自武享吧-https://www.hula8.net/article/6365.html

A.管程   从上到下       B.壳程   从下到上文章源自武享吧-https://www.hula8.net/article/6365.html

C.管程   从下到上       D.壳程   从上到下文章源自武享吧-https://www.hula8.net/article/6365.html

132.在间壁式换热器中,冷、热两流体换热的特点是(   B  )。文章源自武享吧-https://www.hula8.net/article/6365.html

A.直接接触换热     B.间接接触换热     C.间歇换热     D.连续换热文章源自武享吧-https://www.hula8.net/article/6365.html

133.会引起列管式换热器冷物料出口温度下降的事故有(  D   )。文章源自武享吧-https://www.hula8.net/article/6365.html

A.正常操作时,冷物料进口管堵    B.热物料流量太大文章源自武享吧-https://www.hula8.net/article/6365.html

C.冷物料泵坏                    D.热物料泵坏文章源自武享吧-https://www.hula8.net/article/6365.html

134.有两台同样的列管式换热器用于冷却气体,在气、液流量及进口温度一定的情况文章源自武享吧-https://www.hula8.net/article/6365.html

下,为使气体温度降到最低,拟采用(  C  )。文章源自武享吧-https://www.hula8.net/article/6365.html

A.气体走管内,串联逆流操作    B.气体走管内,并连逆流操作文章源自武享吧-https://www.hula8.net/article/6365.html

C.气体走管外,串联逆流操作    D.气体走管外,并连逆流操作文章源自武享吧-https://www.hula8.net/article/6365.html

135.总传热系数与下列哪个因素无关(  A  )。文章源自武享吧-https://www.hula8.net/article/6365.html

A.传热面积     B.流体流动状态     C.污垢热阻     D.传热间壁壁厚文章源自武享吧-https://www.hula8.net/article/6365.html

136.以下不能提高传热速率的途径是(  A   )。文章源自武享吧-https://www.hula8.net/article/6365.html

A.延长传热时间    B.增大传热面积    C.增加传热温差    D.提高传热系数K文章源自武享吧-https://www.hula8.net/article/6365.html

137.换热器经长时间使用需进行定期检查,检查内容不正确的是(   D  )。文章源自武享吧-https://www.hula8.net/article/6365.html

A.外部连接是否完好                  B.是否存在内漏文章源自武享吧-https://www.hula8.net/article/6365.html

C.对腐蚀性强的流体,要检测壁厚      D.检查传热面粗糙度文章源自武享吧-https://www.hula8.net/article/6365.html

138.列管式换热器在停车时,应先停(  A  ),后停(  A  )。文章源自武享吧-https://www.hula8.net/article/6365.html

A.热流体   冷流体    B.冷流体   热流体    C.无法确定    D.同时停止文章源自武享吧-https://www.hula8.net/article/6365.html

139.列管式换热器一般不采用多壳程结构,而采用(   D   )以强化传热效果。文章源自武享吧-https://www.hula8.net/article/6365.html

A.隔板     B.波纹板     C.翅片板    D.折流挡板文章源自武享吧-https://www.hula8.net/article/6365.html

140.管式换热器与板式换热器相比(   D   )。文章源自武享吧-https://www.hula8.net/article/6365.html

A.传热效率高    B.结构紧凑    C.材料消耗少    D.耐压性能好文章源自武享吧-https://www.hula8.net/article/6365.html

141.二次蒸汽为(  D  )。文章源自武享吧-https://www.hula8.net/article/6365.html

A.加热蒸汽                    B.第二效所用的加热蒸汽文章源自武享吧-https://www.hula8.net/article/6365.html

C.第二效溶液中蒸发的蒸汽      D.无论哪一效溶液中蒸发出来的蒸汽文章源自武享吧-https://www.hula8.net/article/6365.html

142.热敏性物料宜采用(  C  )蒸发器。文章源自武享吧-https://www.hula8.net/article/6365.html

A.自然循环式    B.强制循环式    C.膜式    D.都可以文章源自武享吧-https://www.hula8.net/article/6365.html

143.在一定的压力下,纯水的沸点比NaCl水溶液的沸点(  B   )。文章源自武享吧-https://www.hula8.net/article/6365.html

A.高    B.低    C.有可能高也有可能低    D.高20℃文章源自武享吧-https://www.hula8.net/article/6365.html

144.蒸发可适用于(  A   )。文章源自武享吧-https://www.hula8.net/article/6365.html

A.溶有不挥发性溶质的溶液                     B.溶有挥发性溶质的溶液文章源自武享吧-https://www.hula8.net/article/6365.html

C.溶有不挥发性溶质和溶有挥发性溶质的溶液     D.挥发度相同的溶液文章源自武享吧-https://www.hula8.net/article/6365.html

145.下列蒸发器不属于循环型蒸发器的是(   A  )。文章源自武享吧-https://www.hula8.net/article/6365.html

A.升膜式    B.列文式    c.外热式    D.标准型文章源自武享吧-https://www.hula8.net/article/6365.html

146.对于在蒸发过程中有晶体析出的液体的多效蒸发,最好用下列(  C  )蒸发流程。文章源自武享吧-https://www.hula8.net/article/6365.html

A.并流法    B.逆流法    C.平流法    D.都可以文章源自武享吧-https://www.hula8.net/article/6365.html

147.循环型蒸发器的传热效果比单程型的效果要(   B  )。文章源自武享吧-https://www.hula8.net/article/6365.html

A.高    B.低    C.相同    D.不确定文章源自武享吧-https://www.hula8.net/article/6365.html

148.逆流加料多效蒸发过程适用于(   C  )。文章源自武享吧-https://www.hula8.net/article/6365.html

A.黏度较小溶液的蒸发                         B.有结晶析出的蒸发文章源自武享吧-https://www.hula8.net/article/6365.html

C.黏度随温度和浓度变化较大的溶液的蒸发       D.都可以文章源自武享吧-https://www.hula8.net/article/6365.html

149.有结晶析出的蒸发过程,适宜流程是(  C   )。文章源自武享吧-https://www.hula8.net/article/6365.html

A.并流加料    B.逆流加料    C.分流(平流)加料    D.错流加料文章源自武享吧-https://www.hula8.net/article/6365.html

150.蒸发操作中所谓温度差损失,实际是指溶液的沸点(  C   )二次蒸汽的饱和温度。文章源自武享吧-https://www.hula8.net/article/6365.html

A.小于    B.等于    C.大于    D.上述三者都不是文章源自武享吧-https://www.hula8.net/article/6365.html

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