A. wash B. be mixed C. loosen D. be purified 【解析】脏油在再次使用前必须【被净化】。 D
12.Oil separation is achieved in a clarifier bowl where the impurities and water collected at the bowl ______.
A. bottom B. center C. top D. periphery
【解析】在分杂机进行分离时，杂质和水聚集在分离筒的【外围】。 D
13A _______ is arranged for cleaning the lubricating oil in the system and clean oil can be provided from a storage tank. A. filter B. distiller C. centrifuge D. generator 【解析】【离心分油机】用来清洁从储存柜提供润滑油系统的润滑油。C
14.The position of the interface between oil and water within a centrifuge is achieved by the use of _______.
A. gravity disc B. a stack of discs C. centrifugal bowl D. main sealing ring 【解析】离心式分油机中，油水之间的界面是通过比重环来实现的。A 15.Which ring dam arrangement should be used for centrifugal purification? A. The largest inside diameter ring without loss of oil B. The largest outside diameter ring without loss of oil C. The smallest inside diameter ring without loss of oil D. The smallest outside diameter ring without loss of oil 【翻译】对于离心分油机，比重环的尺寸应该是【不会损失油最大内径的环】。 A 【分析】比重环内径越大，油水分界面越向外，那么能净化的油越多 ，净化速率越高。
16.In a purifier, the interface between the liquid seal and the oil should be positioned as close as possible to ________.
A. the outlet of oil B. the bowl periphery C. the outlet of water D. the center of bowl
【解析】在分水机中，油水界面应尽可能地靠近分离筒的四周。 B
17. The interface between the liquid(water) seal and the oil should be positioned _____ possible to the bowl periphery.
A. as far as B. as close as C. as soon as D. as closer as
【解析】在分水机中，油水界面应尽可能地靠近分离筒的四周。 B
18.The position of the interface between oil and water within a centrifuge is achieved by the use of _______.
A. gravity disc B. a stack of discs C. centrifugal bowl D. main sealing ring 【解析】离心式分油机中，油水之间的界面是通过比重环来实现的。A 19. Which of the following is not true about the gravity disc?
A. The location of the interface can be changed by exchanging the diameter of the gravity disc.
B. A larger diameter of gravity can cause the interface far away from bowl center. C. The diameter of the gravity should not break the water seal. D. In practice, the use of monograms is the best operation.
【解析】实际上，使用有图案刻纹的比重环是最恰当的是错误的。D
20.High speed rotation in a centrifugal purifier can produce a force ______ the force of gravity.
A. many thousand times larger than B. many thousand times smaller C. the same as D. none of the other alternatives
【解析】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 21.Oil separation is speeded up by the use of _______. A. oily water separator B. strainer and fine filter C. drain cock D. centrifuge
【解析】分油可以通过离心分离来加速。 D
22.The setting or positioning of the interface between oil and water is achieved by the use of ______ at the outlet of the centrifuge.
A. dam ring B. flushing water C. operating water D. neck ring
【解析】油水分界面的设置以及定位是通过比重环的使用来实现的。 A 23.Both fuel oils and lubricating oils require _____ before passing to the engine. A. treatment B. heating C. cooling D. boiling
【解析】燃油和滑油进入发动机前都需要进行处理。A
24.The treatment of the fuel oils involves storage, heating, filtering and ______. A. centrifuging B. pressurizing C. atomization D. igniting 燃油处理包括储存、加热、过滤和离心分离。 A
25. Why is it necessary to remove impurities from fuel oil and lube oil before being used?
A. To ensure good combustion B. To reduce wear
C. To reduce corrosion D. Any one of the other alternatives 【解析】对于燃油和滑油在使用之前移除杂质是必要的，因为可以确保完全燃烧，减少磨损和腐蚀。 D
26.Which method of removing impurities is the most widely used? A. Coarse filtering B. Fine filtering
C. Centrifuging D. None of the other alternatives 【解析】最广泛使用移除杂质的方法是离心分离。C
27.How does the gravity disc affect the location of the interface?
A. Changing to a gravity disc with larger hole diameter will move the interface towards the bowl periphery.
B. Changing to a gravity disc with smaller hole diameter will move the interface towards the bowl periphery.
C. Changing to a gravity disc with larger hole diameter will move the interface towards the bowl center.
D. None of the other alternatives.
【解析】比重环换成大直径，将会使分界面向分离筒周围移动。 A 28.What are the factors influencing the interface position?
A. Oil viscosity and density B. Throughput and back pressure C. Gravity disc D. Any one of the other alternatives 【解析】影响油水分界面的位置有油粘度及密度，流量背压以及比重环直径大小等因素。 D
29.Which one is right about the interface position?
A. The interface will be located closer to the bowl periphery when the throughput is low.
B. The interface will be located closer to the bowl periphery when the back pressure is low
C. The feed rate will have an effect on the interface. D. None of the other alternatives.
【解析】供给的流速对分界面有一定的影响。 C
30.Factor influencing the position of the interface between the liquid seal and the oil in a purifier is ________.
A. throughput B. back pressure C. gravity disc D. any one of the other alternatives 【解析】影响油水分界面的位置有流量，背压以及比重环直径大小等因素。 D 31.Which of the following substances is satisfactorily removed from the fuel by a centrifugal oil purifier?
A. Impurities B. Lube oil C. Gasoline D. Diesel fuel 杂质可以通过离心分离机被满意地从燃油中移除。 A
32.When centrifuging heavy fuel oil , (an) important factor(s) to consider is the _______.
I. flow rate ; II. viscosity of the fuel oil
A. I only B. II only C. both I and II D. neither I or II
【解析】当离心分离重质燃油时，应考虑油的流量和黏度等因素。 C
考点3：出水口跑油
比重环选取内径过大 ①出水口跑油原因 油温过高、过低 水封未建立 脏污 高置水箱缺水
流速太高，冲破水封
分油量太大，分界面外移
①油温过高，导致水封水蒸发，水封被破坏；水温过低，首先油的粘度高了不易分离，也可能导致水封水结冰，水封破坏。 对应习题2.5.1【6,8,11,12，23，24，31
1.If diesel fuel was discharging from the waste outlet of a disk type centrifugal
purifier operating as a separator you should _______.
A. re-prime the purifier B. remove the discharge ring
C. slow the purifier to its proper speed D. put in an additional discharge ring 【解析】如果出水口跑油，可以【重新建立水封】。A
2.If the bowl of a disk type centrifugal purifier when operated as a separator is not primed , the ______.
A. oil has a tendency to emulsify in the bowl
B. purifier will act as a clarifier at the discharge ring C. oil will be lost through the water discharge ports
D. oil solids will be deposited only at the intermediate top disk 【解析】如果分油机的分离筒没有灌注，【出水口跑油】。 C 3.A poorly cleaned lube oil purifier bowl may result in _______. A. insufficient oil supply to the gravity tank B. improper separation
C. excessive lube oil consumption D. excessive water discharge rate
【解析】滑油分油机的分离筒清洁不良会导致【分离不当】。 B
4.When used as a separator , a centrifugal purifier may lose its seal and cause ______. A. water to contaminate the lube oil B. the purifier pump to lose suction
C. water to flow from the oil discharge D. oil to flow from the water discharge 【解析】密封破坏，可能会导致【出水口跑油】。 D
5.If the temperature decreases, what will happen with the interface in the bowl of an oil separator?
A. Decrease of capacity
B. It will have no effect on the interface C. Broken water seal, oil outside the top disc D. Interface moves towards center 【解析】如果温度下降，【液封打破，出水口跑油 】 C
6.What will happen with the interface in the bowl, if the flow is too high? A. Broken water seal B. The separation of the oil is good
C. The separation of the oil is bad D. It will have no effect on the interface 【解析】如果流量太高，【液封将会被打破】。 A
7. The diameter of the _______ is too big . It causes oil to flow through the water outlet.
A. vertical shaft B. bowl C. gravity disc D. oil outlet pipe 【解析】【比重环】的直径太大，导致出水口跑油。 C
考点4.排渣口跑油 考点5.其他故障
①剧烈振动（vibration）应当停机 其原因基本都是安装问题或分离同外围杂质太多，导致重力分布不均 ②
对应习题：2.5.1【7，25，35
1.A centrifugal fuel oil purifier should be shut down if ______. A. more sealing water is needed B. the cover clamp needs tightening
C. the purifier has a bad vibration when started D. water is discharged from the overflow line 【解析】如果分油机【启动时震动剧烈】，应该被停车。 C
2. What will you do if the purifier starts to vibrate ,or has heavy vibrations? A. Check the vibration alarm
