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1、第二章船舶辅助机械 1090 A vane pump belongs to _ according to its working principle.根据工作原理，叶片泵属于容积式泵。A. reciprocating pump B. positive displacement pumpC. centrifugal pump D. centripetal pump Through a _ pump, the liquid is transferred from the suction to the discharge by the mechanical variation of the volu
2、me of a chamber or chambers.对于容积式泵，液体通过泵腔室体积的改变从吸入口排至排出口。A. positive displacement B. ejector C. centrifugal D. air compressor 1092 A mono-pump is a single-screw pump. That means it consists of _ rotor(s).单螺杆泵只有一个转子。 A. one B. two C. three D. four 1093 The gear and screw pumps are classified as _ 齿轮泵
3、和螺杆泵都属于容积式泵。A. variable stroke pumps B. multistage pumps C. positive displacement pumps D. triple-ported pumps 1094 Gear pumps are of positive displacement type pumps because they discharge a near constant amount of liquid _ pressure.不管压力如何，齿轮泵的排量几乎恒定。A. depending on B. in relative to C. regardless
4、of D. because of1090 B 1091 A 1092 A 1093 C 1094 C,1095 A gear pump belongs to _ according to its working principle.根据工作原理，齿轮泵属于容积式泵。A. reciprocating pumps B. positive displacement pumpsC. centrifugal pumps D. centripetal pumps 1096 The pressure head of a pump is given in the unit of _ 泵的压头常用“米液柱”高度
5、表示。A. kg B. MPa C. meter fluid colunm D. None of the above is true. 1097 A centrifugal pump produces the required pressure energy by means of a rotating _ provided with vanes.离心泵通过旋转带有叶片的叶轮来产生压力能。A. propeller B. impeller C. circumference D. screw 1098 The discharge flow of a reciprocating pump is_ 往
6、复泵的排量具有脉冲性。A. steady B. in pulsation C. continuous D. large 1099 In a _ the center screw is driven and the outer screws idle.A. single screw pump B. double-screw pump在三螺杆泵中，只有中间螺杆被驱动。C. triple screw pump D. centripetal pump A Screw pump belongs to _ according to its working principle.根据工作原理，螺杆泵属于容积式
7、泵。A. reciprocating pumps B. positive displacement pumpsC. centrifugal pumps D. centripetal pumps1095 B 1096 C 1097 B 1098 B 1099 C 1100 B,1101 The amount of fluid delivered by a screw pump can be regulated by _ 齿轮泵属于容积式泵，排量只能通过改变转子的速度来调节。A. throttling the pressure line B. changing the speed of the r
8、otorC. either A or B D. None of the above is true. 1102 While flowing through the volute in a centrifugal pump, part of the _ energy of the liquid is converted to _ energy.当液体经过离心泵的涡壳时，部分动能转换成压力能。A. kinetic/pressure B. kinetic/essential C. pressure/kinetic D. pressure/height1103 The amount of fluid
9、delivered by a centrifugal pump can be regulated by _ 离心泵的排队量可通过改变压力来调节，出可通过改变转子的速度调节。A. throttling the pressure line B. changing the speed of the rotorC. either A or B D. None of the above is true. The amount of fluid delivered by a reciprocating pump can be regulated by _ 往复泵属于容积式泵，排量通过改变柱塞的速度来调节。
10、 A. throttling the pressure line B. changing the speed of the pistonC. either A or B D. None of the above is tree. 1105 The amount of fluid delivered by a positive displacement pump can be regulated by _对于容积式泵，排量只能通过改变转子的速度来调节。A. throttling the pressure line B. changing the speed of the driving roto
11、r C. either A or B D. None of the above is true.1101 B 1102 A 1103 C 1104 B 1105 B,1106 Which of the following pumps are seE-priming, and can deal with hquid from a levelbelow the pump? reciprocating; rotary; centrifugal.往复泵和旋涡泵都具有干吸能力，而离心泵没有。 A. only B. and C. and D. and 1107 The amount of fluid de
12、livered by a helical pump can be regulated by _ 螺旋泵属于容积式泵，排量只能通过改变转子的速度来调节。A. throttling the pressure line B. changing the speed of the rotorC. either A or B D. None of the above is true.1108 A positive displacement pump is that where the volume of the pump chamber is alternately increased to _ and
13、then decreased to对于容积式泵，泵腔室体积增大时吸人液体，体积减少时则排出液体。 A. draw the liquid in/force the liquid out B. force the liquid out / draw the liquid inC. suction/draw D. deliver/outlet Throttling in the _ line of a centrifugal pump involves the risk of the pumpcavitation.对于离心式泵，节流吸人管路，会产生气蚀危险。 A. suction B. exhaus
14、t C. pressure D. discharge1110 As for a hydraulic single action vane pump, the inner wall of the stator is usually of_ shape.对于液压单作用叶片泵，静子的内壁通常是圆形。 A. circular B. elliptical C. rectangular D. hexagon1106 B 1107 B 1108 A 1109 A 1110 A,l111 As for a hydraulic vane pump, which of the following is in co
15、ntact with the vanes during working: the rotor; the pump shaft; the external surface of the housing.对于液压叶片泵，工作时，转子与叶片接触。A. only B. only C. and D. and l l 12 Shaft sealing in a centrifugal pump can be effected by _ 离心泵的轴封可用机械密封，也可用填料箱。A. the mechanical seal B. packed stuffing boxes C. either A or B D
16、. neither A nor B l 113 A reciprocating pump belongs to _ according to its working principle.根据工作原理，往复泵属于容积式泵。 A. injector pumps B. positive displacement pumpsC. centrifugal pumps D. centripetal pumps 1114 A _ pump is that where the volume of the pump chamber is alternately increasedto draw the liqu
17、id in and then decreased to force the liquid out.对于容积式泵，泵腔室体积增大时吸人液体，体积减少时则排出液体。 A. injector B. positive displacement C. centrifugal D. centripetal 1115 What is the purpose of a relief valve? 释放阀可用来当排出阀关闭时将液体回流到吸人侧。A. to fill 2 tanks at the same time B. to use pump at a higher pressureC. to return liquid to suction side if discharge valve is closedD. All of the above are true.1111 A 1112 C 1113 B 1114 B 1115 C,
