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 pump1091 Through a _ pump, the liquid is transferred from the suction to the discharge by the mechanical variation of the volume 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 compressor1092 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. four1093 The gear and screw pumps are classified as _ 齿轮泵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 pumps1094 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 of D. because of1090 B 1091 A 1092 A 1093 C 1094 C1095 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 pumps1096 The pressure head of a pump is given in the unit of _ 泵的压头常用“米液柱”高度表示。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. screw1098 The discharge flow of a reciprocating pump is_ 往复泵的排量具有脉冲性。A. steady B. in pulsation C. continuous D. large1099 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 pump1100 A Screw pump belongs to _ according to its working principle.根据工作原理，螺杆泵属于容积式泵。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 rotorC. 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 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.1104 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。 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 rotor 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 delivered 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 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/outlet1109 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. exhaust 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 Al111 As for