第三章测试
1.Which of the following valves is an essential part of reciprocating pumps? 下列哪种阀门是容积泵的重要组成部分之一?( )
A:Gate valve 闸阀 B:Globe valve 截止阀 C:Plug cock 旋塞阀 D:Ball valve 球阀 E:Check valve 逆止阀
答案:E
2.Increasing the total power of a centrifugal pump will most likely cause the developed head to _____. 增大离心泵的总功率最有可能导致泵压头_____. ( )
A:too little information to determine 无法判断 B:none of the rest 其余都不对 C:remain constant 不变 D:decrease 下降 E:increase 上升 3.Which of the following devices needs priming? 下列哪种设备在使用前须灌泵 ( )
A:Volute pump 螺旋泵 B:Plunger pump 柱塞泵 C:Spur-gear pump 外齿轮泵 D:Diaphragm pump 隔膜泵 E:Piston pump 活塞泵 4.Which of the following correctly lists gas-moving devices in ascending order in terms of their power (in general)? 以下哪个选项是按由小到大的顺序将气体输送设备的功率范围加以排列的?( )
A:Fan < Positive-displacement Blower < Centrifugal Blower < Centrifugal Compressor < Positive-displacement Compressor风机 < 容积式鼓风机 < 离心式鼓风机 < 离心式压缩机 < 容积式压缩机 B:Fan < Centrifugal Blower < Centrifugal Compressor < Positive-displacement Blower < Positive-displacement Compressor 风机 < 离心式鼓风机 < 离心式压缩机 < 容积式鼓风机 < 容积式压缩机 C:Fan < Positive-displacement Blower < Positive-displacement Compressor < Centrifugal Blower < Centrifugal Compressor 风机 < 容积式鼓风机 < 容积式压缩机 < 离心式鼓风机 < 离心式压缩机 D:Fan < Positive-displacement Blower < Centrifugal Blower < Positive-displacement Compressor < Centrifugal Compressor 风机 < 容积式鼓风机 < 离心式鼓风机 < 容积式压缩机 < 离心式压缩机 E:none of the rest 其余均不对 5.We normally prefer gas compression to be _____, so that it can be done more easily. 从简易可操作性出发,我们通常希望希望气体压缩过程是_____。( )
A:isochoric 恒容的 B:polytropic 多方的 C:isobaric 恒压的 D:adiabatic 绝热的 E:isothermal 恒温的 6.Which of the following statements about flow meters is FALSE? 以下关于流量计的哪种说法是错误的? ( )
A:The Venturi meter cannot measure velocity distribution in a flow. 文丘里管无法测量流体的速度分布。 B:The Pitot tube cannot measure the overall rate of a flow. 皮托管无法测量流体的总流量。 C:In a rotameter, the float reaches equilibrium when drag force balances its gravity. 在转子流量计中,当转子达到平衡态时,它所受的曳力与重力相平衡。 D:The Venturi meter has fixed cross section areas, but varying pressure drop; while rotameter is the opposite 文丘里管利用恒定的横截面积和变动的压降来测量流量;转子流量计则相反。 E:The rotameter measures the overall flow rate. 转子流量计可以测量流体总流量。

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