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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 pump C. centrifugal pump D. centripetal pump 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 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 of D. because of 1090 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 pumps C. 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，螺杆泵属于容积式泵。 A. reciprocating pumps B. positive displacement pumps C. centrifugal pumps D. centripetal pumps 1095 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 rotor C. 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/height 1103 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 rotor C. 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。 A. throttling the pressure line B. changing the speed of the piston C. 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 level below 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 rotor C. 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 in C. suction/draw D. deliver/outlet Throttling in the _ line of a centrifugal pump involves the risk of the pump cavitation.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. discharge 1110 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. hexagon 1106 B 1107 B 1108 A 1109 A 1110 A,l111 As for a hydraulic vane pump, which of the following is in contact 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. 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 pumps C. centrifugal pumps D. centripetal pumps 1114 A _ pump is that where the volume of the pump chamber is alternately increased to draw the liquid 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 pressure C. to return liquid to suction side if discharge valve is closed D. All of the above are true. 1111 A 1112 C 1113 B 1114 B 1115 C,1116 The pump discharge pressure will be considerably higher than the pressure at the _泵的排出压力比泵进口支管的压力要高得多。 A. pump entry branch B. outlet pipe C. impeller D. None of the above is tree. 1117 Which of the following pumps belongs to centrifugal- pump? 扩压式泵属于离心式泵。 A. Piston pump B. Screw pump C. Diffuser pump D. Water-ring pump 1118 The volute pump is one in which the impeller _对于旋涡泵，叶轮将液体排至渐渐变宽的流道。 A. discharges into a gradually widening channel B. has stationary diffuser vanes C. produces no kinetic energy D. All of the above are true. In _ pumps a closed discharge valve will cause bursting discharge pressure. 柱塞泵是容积式泵，排出阀关闭将会产生具有破坏性的压力。 A. centrifugal B. plunger C. injector D. water 1120 Which of the following pumps are self-priming, and can deal with liquid from a level below the pump; ejector; screw; centrifugal. 喷射泵和螺杆泵都具有干吸能力，而离心泵没有。 A. only B. and C. and D. and 1116 A 1117 C 1118 A 1119 B. 1120 B,1121 The amount of fluid delivered by a gear 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 rotor C. either A or B D. None of the above is true 1122 Attempts are made to eliminate axial thrust in centrifugal pump by _ 消除离心泵的轴向力，可使用具有平衡孔的叶轮，也可使用对称叶轮。 A. providing the impeller with balancing holes B. the use of symmetrical impeller C. neither A nor B D. either A or B 1123 Which of the following pumps will build up a bursting pressure or stall their motors if the discharge valves are closed? gear; . centrifugal; . screw. 齿轮泵和螺杆泵都是容积式泵，排出阀关闭将会产生具有破坏性的压力，而离心泵不会。 A. and B. and C. and D. and Which of the following operating features do displacement pumps bear if they are working under no-cavitation condition? . output is almost directly proportional to speed; . they are self-priming; . they will develop a discharged pressure equal to the resistance to be overcome, irrespective of speed. 容积式泵正常工作时具有以下特性：排量几乎与转速成正比；具有自吸能力；不管速 度如何，都能产生大小等于需克服阻力的排出压力。 A. and B. and C. and D. and 1125 The _ pump discharges a nearly constant amount of liquid regardless of pressure. 不管压力如何，容积式泵的排量几乎恒定。 A. mixed-flow B. axial-flow C. centrifugal D. displacement 1121 B 1122 D 1123 C 1124 D 1125 D,1126 Which of the following pumps is used where a relatively high pressure and small capacity are required?往复泵一般用于高压头、小排量的场合。选项C应是“reciprocating pump”。 A. Volute pump B. Diffuser pump C. Regenerative pump D. All of the above 1127 Some pumps use packing as sealing gland. The gland should be _ 一些泵使用填料作为密封格兰，注意要少许松一点，让液体稍微泄漏。 A. slack enough to allow slight leakage of fluid B. slightly clocked C. brought up tight so as not to allow any leakage D. fitted with a relief valve 1128 Air chambers are usually fitted to reciprocating pumps in order to _ 往复泵中的空气室用来保持流量稳定。 A. increase discharge pressure B. increase suction vacuum C. develop pulsation flow D. keep a steady rate of flow 1129 The pipe friction and the resistance will _ as a result of an increase in the amount of fluid flowing through the system. 系统流量增加时，管路摩擦和阻力将增大。注意“rise”与“raise”之区别。 A. reduce B. rise C. raise D. fall 1126 C 1127 A 1128 D 1129 B,1130 Which of the following will be the advantage of a centrifugal pump as compared with a reciprocating pump? Its discharge is continuous; It has no internal valves; Upon accidental closing of discharge valve, excessive pressure will not build up. 离心泵与往复泵相比具有以下优点：排量连续；无内部阀件；如果排出阀关闭，不会产生过高的压力。 A. B. C. D. only 1131 Which of the following pumps are self-priming, and can deal with liquid from a level below the pump: reciprocating ; vane; gear. A. only B. and C. and D. and 往复泵、齿轮泵和叶片泵都具有干吸能力。 1132 Centrifugal pumps can be designed with a number of impellers _ to attain a high final delivery pressure.离心泵通过几个叶轮串联，可提高其排出压头。 A. in series B. in parallel C. either A or B D. None of the above is true 1133 If an operating auxiliary boiler has a water pH reading of 7, you should _ 如果辅助锅炉给水的pH值是7，则应使用氢氧化钠进行处理，使pH值在10左右； A. bottom blow the boiler B. treat the water with catstic soda C. treat the water with chemical scavengers D. reduce the water alkalinity to recommended readings 1130 C 1131D 1132 A 1133 B,1134 The internal part of the boiler, if found _ , has to be chemically washed by yard. 锅炉内侧发现水垢，应化学清洗。 A. deformed B. rusted C. cracked D. scaled 1135 The internal part of boiler should be welded by yard if found _ 锅炉内侧发现裂纹，应电焊修理。 A. scaled B. cracked C. shape changed D. deformed 1136 The tube in a boiler should be blinded if found _锅炉管子发现泄露，应封死。 A. sealed B. informed C. leaky D. deformed 1137 In a _ boiler the water flows through the inside of the tubes while the hot gases pass around the outside.对于水管锅炉，水在管子内流动，而高温气体在管子外流动。 A. water-tube B. fire-tube C. exhaust gas D. none of the above 1138 In a _ boiler the hot gases from the furnace pass through the tubes while the water is on the outside. 对于火管锅炉，高温气体在管子内流动，而水在管子外流动。 A. water-tube B. fire-tube C. exhaust gas D. None of the above is tree. 1139 _ are mounted in pairs to protect the boiler against overpressure. 锅炉安装安全阀以防锅炉超压。 A. Safety valves B. Water tube C. Steam stop valves D. Blow down valves 1140 The furnace of a oil fired boiler should be _ before the operating burner is lit. 锅炉点火前，应进行扫气。“purge”意“驱气”；而“clear of air“清除空气”。 A. filled with water B. purged C. cleared of air D. None of the above is true 1134 D 1135 B. 1136 C 1137 A 1138 B 1139 A 1140 B,1141 When steam is being raised on a boiler, the water level will normally _ 锅炉开始运行时，水位将随锅炉温度的提高而升高。 A. drop as the boiler warms up B. rise as the boiler warms up C. remain unchanged until the boiler is hot enough D. rise and fall with the steam demand 1142 The donkey boiler may be given a bottom blow _锅炉熄火后，可进行下排污。 A. to raise water level B. only while making steam C. to remove scum D. when fire are secured 1143 The water level in a steaming auxiliary boiler will always _ 辅助锅炉的水位：降随蒸汽需求量的变化而变化。 A. rise when the steam pressure is increased B. remain constant as long as the feed pump operates C. fall when the steam pressure is decreased D. vary as the steam demand changes 1144 The boiler feed water check valves are located on the _锅炉给水单向阀门位于给水管路中。 A. feed pump suction line B. hot well C. shell of the feed heater D. feed lines to the boiler 1145 If in doubt as to the tree water level when a boiler is being oil-fired, you should _ 烧油锅炉运行时，对真实水位没有把握时，应尽快熄火。 A. take no measures B. extinguish the fire as soon as possible C. feed water to the boiler D. open the blow down valve 1141 B 1142 D 1143 D 1144 D 1145 B,1146 The boiler feed pump discharge pressure is higher than the steam dnnn pressure to _ A. ensure feed water flow into the boiler B. keep the steam drum pressure high C. prevent water hammer in the feed line D. help the feed water flash to steam 锅炉给水泵排出压力比蒸汽筒压力要高，才能确保给水进人到锅炉。 1147 Safety valves on a boiler vent to the _锅炉安全阀通大气。 A. fuel tank B. bilge C. atmosphere D. auxiliary exhaust hne 1148 A donkey boiler is _辅锅炉即辅助性锅炉。 A. one to supply steam to the main propulsion turbine B. an auxiliary boiler C. A and B D. neither A nor B 1149 The safety valves should be tested and adjusted when the boiler survey is _ 当进行锅炉检验时，应对锅炉安全阀作试验和调整。 A. completed B. carried out C. cleaned D. steamed 1150 You should frequently compare dram-mounted and remote-reading water level indicators. _ between these have contributed to failures because of overheating through shortage of water, when a boiler was being oil-fired. 锅筒旁的水位指示器与遥控水位指示器的读数要经常进行比较，两者的偏差会成为锅炉运行故障(因缺水而过热)的原因。 A. Descriptions B. Discrepancies C. Different D. Deflections 1146 A 1147 C 1148 B 1149 B 1150 B,1151 Impurities from the boiler water surface can be removed through the _ 锅炉水面的杂质可通过上排污阀清除。 A. safety valve B. blow down valve C. scum valve D. feed check valve 1152 In motor ship, _ is often used to recover some of the heat carried in the exhaust gases from the main engine .在内燃机船上，装备废气锅炉用来回收主机废气携带的热量 A. an diesel oil heater B. a waste heat boiler C. a fresh water generator D. all the above 1153 _ will be used to blow away the combustion products from the tube surfaces. A. The blow down valve B. The scum valve C. The air release cock D. The soot-blower 吹灰器用来吹除管子表面的燃烧产物。 1154 Latent heat changes the _ of water.潜热能改变水的物理状态。 A. physical state B. temperature C. atmospheric pressure D. sensible pressure 1155 The amount of heat released by steam when it changes to water at the same temperature is called _在同样的温度下，蒸汽变成水时所释放的热量，称为冷凝潜热。 A. latent heat of condensation B. latent heat of vaporization C. latent heat of saturation D. sensible heat of condensation 1151 C 1152 B 1153 D 1154 A 1155 A,As for an oil-fired boiler if at a normal steaming condition and water goes out of sight in gauge glasses the action you should take is: secure oil to fires; )increase feed pump pressure. 发现锅炉水位表断水，应立即熄火，而不能盲目地增大给水泵的压力。 A. B. and C. D. neither and 1157 As for a oil-fired boiler too much air would indicated by _ 对于烧油锅炉，空气过多，火焰呈亮白色。 A. yellowish flame B. golden yellow flame C. milky flame D. brilliant white flame 1158 W.H. R stands for _ WHR代表废热回收装置。 A. Water Head Register B. Water Heater Re-circulating C. Waste Heat Recovery D. Waste Handle Reference 1159 When the boiler load returns to normal, the drum pressure will rise and steam bubble formation will reduce, causing a fall in water level. This is known as _当锅炉负荷回到正常时，锅筒压力上升，气泡减少，水位下降。这种现象被称为“收 缩”。 A. swell B. shrinkage C. flash off D. lack of water 1160 A dazzling white burner flame in the boiler furnace indicates _ A. no combustion B. deposits in the fuel见第1157题。 C. excessive air in the fuel D. cold fuel oil 1156 A 1157 D 1158 C 1159 B 1160 C,1161 The water level showing in a boiler water gauge glass is usually _ during working. A. higher than the actual drum water level B. equal to the actual drum water level C. increasing due to steam condensation in the glass D. lower than actual drum water level 锅炉运行期间，水位表显示的水位比锅筒实际水位要低。这是因为锅炉水是水和汽 泡的混合物(水位表本身上端通汽下端通水)，向锅炉供水后，等汽泡凝结，水位反而下降。 Which of the following may hardness of the boiler water cause? scale formation; tube failure; corrosion.炉水硬度会引起水垢，管子损坏以及腐蚀等问题。 A. and B. and C. and D. and 1163 The separation of impurities and water from _ is essential for good combustion of diesel engines.从燃油中去除杂质和水分，这对柴油机发火燃烧很重要。 A. lube oil B. fuel oil C. turbine oil D. grease 1164 High-speed rotation in a centrifugal purifier can produce a force _ the force of gravity.离心式分油机高速旋转时产生的离心力比重力大几千倍。 A. many thousand times larger than B. the same as C. many thousand times smaller D. none of the above 1165 _ are used to ensure that ships dont discharge oil when pumping out oily water from any oil contaminated space. 船舶上的油水分离器能保证船舶排放舱底水等污水时不排油。 A. Boiler B. Incinerator C. Oily water separator D. Sewage treatment unit 1161 D 1162 D 1163 B 1164 A 1165 C,1166 Oil water separators are used to ensure that ships don t discharge oil when pumping out _见上题。 A. ballast water B. boiler water C. bilge water D. sewage water 1167 The bilge main is mamlged to drain any watertight compartment _ ballast, oil or water tanks and to discharge the contents overboard. 舱底水总管设计用来排放除了压载舱、燃油舱和水舱之外的任何水密空间的污水到 舷外。otherthan=except。 A. rather than B. other than C. in addition that D. except for 1168 Emulsification of oil will occur when mixed with _油与水混合后会产生乳化。 A. air B. black oil C. water D. ice cream 1169 A centrifuge arranged to separate two liquids is known as _ 离心式分油机设计用来分离两种液体时，被称为分水机。 A. an oily water separator B. a purifier C. a centrifugal compressor D. a clarifier 1170 A centrifuge arranged to separate impurities and small amounts of water from oil is known as _离心式分油机设计用来分离油中的杂质和少量水时，被称为分杂机。 A. an oily water separator B. a purifier C. a centrifugal compressor D. a clarifier 1166 C 1167 B 1168 C 1169 B 1170 D,1171 When a clarifier is running the impurities and water collect at the bowl _ 分杂机运行时，由于杂质比重较大，积聚在分离筒的四周。 A. center B. periphery C. inlet D. upper parts 1172 For many years marine centrifuges were designed for _ operation, that is the machines were run for a period during which solids accumulated in the bowl. The machine was stopped when the accumulated solids began to impair its performance. 很多年以来，离心式分油机被设计成分批运行。意即，分油机运行一段时间，固体杂质积聚在分离筒内，当分油机停止运行时，才开始排渣。 A. purifying B. batch C. long period D. temporary 1173 For a purifier, changing to a gravity disc with larger hole diameter will move the interface towards the _对于分水机，使用较大直径的比重环，油水界面会向分离筒四周移动。 A. bowl periphery B. bowl center C. upper surface D. lower surface 1174 For a purifier changing to a gravity disc with smaller hole diameter will move the interface towards the _对于分水机，使用较小直径的比重环，油水界面会向分离筒中心移动。 A. bowl periphery B. bowl center C. upper surface D. lower surface 1175 In an oily water separator the oil will travel _ to the oil collecting spaces. 在油水分离器中，油是向上运动到集油室的。 A. upwards B. downwards C. outwards D. forwards 1171 B 1172 B 1173 A 1174 B 1175 A,1176 When started, a complete oily water separating unit is first filled _ . The oily water mixture is then pumped through the inlet pipe into the coarse separating compartment. 油水分离器开始工作时应首先注满清水。 A. with dirty water B. with clean water C. by oily water D. by mixed water 1177 A high rate of separation between oil and water is favored by _ 油滴尺寸大，将有助于油、水分离。 A. large size of oil globu
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