![轮机英语新教材练习题315题_第1页](http://file2.renrendoc.com/fileroot_temp3/2021-5/6/66a4230e-b343-43f9-a070-1b1260103c19/66a4230e-b343-43f9-a070-1b1260103c191.gif)
![轮机英语新教材练习题315题_第2页](http://file2.renrendoc.com/fileroot_temp3/2021-5/6/66a4230e-b343-43f9-a070-1b1260103c19/66a4230e-b343-43f9-a070-1b1260103c192.gif)
![轮机英语新教材练习题315题_第3页](http://file2.renrendoc.com/fileroot_temp3/2021-5/6/66a4230e-b343-43f9-a070-1b1260103c19/66a4230e-b343-43f9-a070-1b1260103c193.gif)
![轮机英语新教材练习题315题_第4页](http://file2.renrendoc.com/fileroot_temp3/2021-5/6/66a4230e-b343-43f9-a070-1b1260103c19/66a4230e-b343-43f9-a070-1b1260103c194.gif)
![轮机英语新教材练习题315题_第5页](http://file2.renrendoc.com/fileroot_temp3/2021-5/6/66a4230e-b343-43f9-a070-1b1260103c19/66a4230e-b343-43f9-a070-1b1260103c195.gif)
版权说明:本文档由用户提供并上传,收益归属内容提供方,若内容存在侵权,请进行举报或认领
文档简介
1、轮机英语新教材练习题1.when a ship in loaded condition floats at arbitrary water line,its displacement is_to the relevant mass of water displaced by the ship. a equal b larger c smaller d equivalent2.the displacement of a ship is_to the total weight,all told,of the relevant loaded ship. a larger b equal c smal
2、ler d equivalent3.which one is not true? a two main areas of skill are involved in the construction of ship. b there are distinct divisions in responsibilities between naval architects and marine engineers. c each ship will assume varying proportions according to its type. d ship can be divided into
3、 different categories from different perspectives.4.why a gearbox is needed in a ship driven by a medium-speed diesel engine? a to reduce the main engine speed. b to increase the main engine speed. c to govern the main engine speed. d to fix the propeller shaft.5.a propeller,in order to operate effc
4、iently,must rotate at a relatively_speed. a high b low c fast d lowly6.in a diesel engine,_offers the heat energy directly;_works as working medium and changes the heat energy to mechanical energy. a the burning of the fuel/medium shaft b fuel spray/fresh air c fuel/fuel spray d the burning of the f
5、uel/the burned gas mixture7.in a diesel engine,_works as working medium and changes the heat energy to mechanical energy,_changes the reciprocating movement to rotary moment. a fuel spray/the burning of the fuel b the burned gas mixture/connecting rod c medium shaft/crankshaft d the burned gas mixtu
6、re/piston rod8.one of the differences between a two-stroke engine and a four-stroke engine is ,_ a a two-stroke engine works without exhaust operation b a two-stroke engine works without compression stroke c a two-stroke engine works without expansion stroke d a two-stroke engine works without sucti
7、on operation9. one of the differences between a two-stroke engine and a four-stroke engine is ,_ a a two-stroke engine cant work without cylinders b a two-stroke engine cant work without pistons c a two-stroke engine cant work without crankshafts d a two-stroke engine cant work without a blower10.in
8、 a diesel engine,when the fuel is injected into the cylinder_ a the piston is just coming upward from the bottom dead center. b the piston has moved about one-fifth of the way up. c the piston has moved most of the way up and almost reached the tdc d the piston has just past the tdc11._is the main r
9、eason that reduces the power advantage of a two-stroke engine over a same size four-stroke to about_. a inefficient scavenging/twice b inefficient scavenging/1.8 times c fewer strokes in a circle/twice d fewer strokes in a circle/1.8 times12.if the engine is naturally aspirated,or is a small highspe
10、ed type with a centrifugal turbocharger,the period of valve overlap,i.e.when both valves are_,will be_,and the exhaust valve will close some 10_top dead canter. a open/short/after b closed/short/after c open/long/before d closed/long/before13.in a two-stroke engine,there are always a series of openi
11、ngs known as_,and in some circumstances,there are also openings known as_,in the part of the cylinder liner inside the scavenging air box. a scavenging air ports/exharst ports b inlet ports/scavenging air ports c scavenging air ports/inlet ports d exhaust ports/inlet ports14.in some type of twostrok
12、e engines,besides some small holes for_,starting valve,safety valve,indicator cock,and so on,there is a large central opening in each cylinder cover for mounting the_ a fuel valves/exhaust valve b exhaust valves/inlet valve c fuel valves/inlet valve d exhaust valves/fuel valve15.in a twostroke ,the
13、piston consists of a lower part,which is named as_and usually made of_,and a upper part,which is referred to as_and made of_ a lowhalf/cast iron/tophalf/heatresistant steel b lowhalf/aluminum/tophalf/stainless steel c piston skirt/cast iron/piston crown/heatresistant steel d piiston skirt/aluminum/p
14、iston crown/stainless steel16.in order to keep the oil film on the cylinder liner during the running-in period,the piston ring are slightly rounded_ a on both the external and internal top edges b on both the external top and bottom edges c on both the external and internal bottom edges d on all the
15、 four edges17.in order to control thermal stresses,some types of modern engines use pistons with_ a heavy wall and intensive cooling b heavy wall and no cooling c thin wall and no cooling d thin wall and intensive cooling18.in order to improve the working conditions of the crosshead bearings,the bea
16、ring pressure is made_and the peripheral speed is made_in later designs. a smaller/higher b higher/smaller c smaller/smaller d higher/higher19.when the heavy fuel oil is heated to achieve the viscosity of 1015 cst,_may occur,to avoid this ,a _system is used in most occasions. a boiling and cavitatio
17、ns/low temperature b boiling and cavitations/pressurized c leaking and boiling/low temperature d leaking and boiling/pressurized20.the fuel from the bunker tanks must be treated by_before entering the service tanks.from where the fuel enters_ a centrifugal separators/the engine cylinder b oily water
18、 separators/the engine cylinder c oily water separators/the fuel supply system d centrifuges/the fuel supply system21.a full-flow 50m filter is installed_,so the injection system components on the main engine are safeguarded. a as close to the main engine as possible b as close to the main pump as p
19、ossible c just before the fuel valve d just before the booster pump22.the booster pump,which supplies diesel oil to _,should have a possibility of being powered by compressed air or by emergency power. a the main engines b the auxiliary engines c the emergency generator engine d the auxiliary engine
20、s and the main engine(s)23._is harmful for fuel pumps,fuel valves,cylinder liner,exhaust valve seats,and the turbocharger blades as well. a bad combustion of the fuel b bad atomization of the fuel c liquid contaminants d solid contaminants24.as an alternative to the conventional seawater cooling sys
21、tem,_is based on _principles about cooler locations,flow control and preheating,but with a central cooler and one additional ste of pumps. a the central cooling system/different b the central cooling system/the same c the open cooling system/different d the open cooling system/the same25.an alarm de
22、vice inserted between the deaerating tank and the expansion tank notify the onwatching crew that_ a the expansion tank is lack of water b the expansion tank is over flowing c there is something wrong with the cooling system d there is something wrong with the engine26.the_cooling system needs least
23、maintenance work for_in this kind of system. a open/the minimum components b open/the high cooling efficiency c central/there are more coolers and a extra set of pumps d central/there is only one component contacts seawater27.about the jacket water,that of the auxiliary engines usually is circulated
24、 by_pumps,and the main engine usually_ a an enginedriven/as well b an enginedriven/has an independent pump c an independent/as well d an independent/has an enginedriven pump28.in order to maintain a constant outlet water temperature of 80-85c from the engine,a three-way valve is installed_ a at the
25、jacket cooler outlet to control the flux through the engine b at the jacket cooler outlet to control the flux through the cooler c at the engine outlet to control the flux through the engine d at the engine inlet to control the flux through the engine29.in modern installations,the main engine and th
26、e standby auxiliary engines_ a can be started at low temperature and are free from preheating b usually are preheated by steam before being started c are kept at a constant temperature and free from preheating d are kept at a low temperature to save energy30.a marine diesel engine is started by_ a s
27、upplying high pressure oil into a hydraulic motor b supplying high temperature air into the cylinder c supplying high pressure air into the cylinder d electrical igniting31.the starting air system of an engine on board usually has interlocks in order to_ a ensure a successful shutting down at emerge
28、ncy conditions b ensure a successful starting at emergency conditions c prevent the engine from starting at some abnormal conditions d prevent the engine from starting at emergency conditions32.in the starting system,the automatic valve is controlled by_,and the cylinder start valves are controlled
29、by_ a pilot air/pilot air b handle/solenoid c handle/pilot air coming through the distributor d solenoid/pilot air coming through the distributor33.the starting air entering the cylinder begins when the piston_ a has nearly come to the tdc b has just past the tdc c has nearly come to the bdc d has j
30、ust past the bdc34.when starting an engine,the compressed air enters the cylinder when the corresponding piston is in position of its_ a suction stroke b compression stroke c power stroke d exhaust stroke35.when an engine is starting and has got a sufficiently high speed ,say about 20rpm,_ a the sta
31、rting air supply is cut off and fuel is injected into the cylinders b the fuel feeding is cut off and the turning gear is put in c the starting air supply is cut off and the turning gear is taken out d the electric blower is shut down and fuel is injected into the cylinders36.the air distributor is
32、conventionally driven by_and distributes_into each cylinder by certain sequence. a camshaft/fresh air b camshaft/starting air c electronic motor which is controlled by a computer/fresh air d electronic motor which is controlled by a computer/starting air37.the following options are all the functions
33、 of lubricating oil except_ a removing heat and deposits b neutralizing acidic products c lubricating d improving combustion efficiency38._diesel engines generally have two systems of lubrication:a total loss system feeding_and a circulating system lubricating the running gear and cooling the piston
34、s. a large crosshead type/crossheads b high speed/the cylinders c large crosshead type/the cylinders d four-stroke/pistons and cylinders39.in some diesel engine designs,the injection of cylinder oil is timed to impings when the piston_and only impinge on_ a is coming upward/cylinder ring belt b is g
35、oing downward/piston ring belt c is coming upward/ piston ring belt d is going downward/ cylinder ring belt40.large crosshead type engine generally has two lubrication systems,a function performed only by cylinder oil system is_ a lubricating b cooling c sealing d cleaning41. large crosshead type en
36、gine generally has two lubrication systems,a function performed only by crankcase oil system is_ a lubricating b cooling c cleaning d neutralizing42.“the use of a poor quality oil can lead to rapid deterioration of its properties with the resultant formation of deposits in the piston crown which in
37、turn results in a considerable reduction in heat transfer with subsequent overheating and thermal cracking”.according to this sentence,we can know that the principle reason of the overheating and thermal cracking is_ a the use of a poor quality oil b the deterioration of its properties c the formati
38、on of deposits d the reduction in heat transfer ability43.gas exchange,which is a basic part of the cycle of an internal conbustion engien,is_ a the supply of normal air and removal of compressed air b the supply of fuel oil and combustion of the atomized oil c the supply of fresh air and removal of
39、 exhaust gases d the supply of fresh air and removal of extra heat 44.“this increase in charge air density is accomplished on most modern diesel engine types by use od exhaust gas turbo-charging,in which a trubine wheel driven by exhaust from the engine is rigidly coupled to a centrifugal type air c
40、ompressor”.according to this sentence,we can know that_increases charge air density,_drives the compressor directly. a a modern diesel engine/a turbine wheel b a modern diesel engine/exhaust gases c a compressor/an exhaust gas turbocharger d a compressor/a turbine wheel45.when the air charge contact
41、s with the cylinders and pistons and mixes with the residual gases,it will_ a increase in temperature b lose its energy partly c expand and do work d beging to be compressed46.usually we take the cooling effect of the air flown through the cylinder during the overlap period as_ a inevitable b harmfu
42、l c helpful d unacceptable47.in slow speed twostroke engines,the fresh air entering begins when_and stops as_ a the inlet port is opened by the up coming piston/the port is closed by the down going piston b the inlet valve is opened by the down going piston/the inlet valve is closed c the inlet port
43、 is opened by the down going piston/the port is closed by the up coming piston d the inlet valve is opened48.the_is employed to warm up a large diesel engine before its starting. a hot air b hot boiler water c cylinder water d hot seawater49.which one of the followings may not be checked before engi
44、ne starting? a tank level b various filters c drains d seawater temperature50.when the direction handle of telegraph is moved,the relative position of camshaft and crankshaft will be_ a changed accordingly b unchanged c positioned ahead d positioned astern51.which of the followings will affect the s
45、pray of fuel oil? a coke deposits b cylinder water temperature c asphalt in fuel oil d lub oil52.which one of the folloeing may contribute to the forming of coke around the nozzle of fuel valve? a too much water in fuel oil b too much asphalt in fuel oil c larger nozzle holes d more nozzle holes inl
46、et valve is closed53.the transmission system transmitting power from the engine to the propeller is composed of shafts,bearings,and_ a propeller b flying wheel c main engine d crankshaft54.the thrust from the propeller to the hull of the ship is transferred by_ a tie rod b thrust block c bedplate of
47、 main engine d frame of main engine55._is used to prevent the entry of sea water to the machinery space. a a special sealing gland b propeller c tailshaft d sterntube bearing56.oil pressure in the lubrication system is_than the static sea water head to ensure that sea water cannot enter the sterntub
48、e in the event of seal failure. a higher b lower c very higher d very lower57.the propeller consists of a_with several blades of helicoidal form attached to it. a shaft b boss c wheel d lever58.the difference between fixed pitch propeller(fpp) and controllable pitch propeller(cpp) is in that a for f
49、p,once fitted,the position of the blades can also be changed in operation b for cp, once fitted,the position of the blades can also be changed in operation c the cp type has a relatively smaller hub compared with the fp propellers d the fp type has a relatively larger hub compared with the cp propel
50、lers59.in conventional system,the injection pressure_,while its_in common rail diesel engines. a fluctuates with the engine speed to some extent/independent of the engine speed b keeps constant at all engine speed/dependent on the engine speed to some extent c keeps constant at all engine speed/inde
51、pendent of the engine speed d is decided by the engine speed/constant at all engine speed60.in common rail engines,the fuel is_before is injected into the cylinders a stored in a common fuel line b pumped by the injection pump c at low pressure d already atomized61.in a common rail engine,the fuel i
52、s injected into cylinders_ a by injection pumps b at a time decided by the injection pump timing c by a signal opening the magnetic valves d at a time decided by the cam directly62._uses one or two high pressure pumps for all the cylinders with one more standby,while_have a separate highpressure pump for each cylinder. a a common rail engine/conventional engines b a conventional engine/common rail engines
温馨提示
- 1. 本站所有资源如无特殊说明,都需要本地电脑安装OFFICE2007和PDF阅读器。图纸软件为CAD,CAXA,PROE,UG,SolidWorks等.压缩文件请下载最新的WinRAR软件解压。
- 2. 本站的文档不包含任何第三方提供的附件图纸等,如果需要附件,请联系上传者。文件的所有权益归上传用户所有。
- 3. 本站RAR压缩包中若带图纸,网页内容里面会有图纸预览,若没有图纸预览就没有图纸。
- 4. 未经权益所有人同意不得将文件中的内容挪作商业或盈利用途。
- 5. 人人文库网仅提供信息存储空间,仅对用户上传内容的表现方式做保护处理,对用户上传分享的文档内容本身不做任何修改或编辑,并不能对任何下载内容负责。
- 6. 下载文件中如有侵权或不适当内容,请与我们联系,我们立即纠正。
- 7. 本站不保证下载资源的准确性、安全性和完整性, 同时也不承担用户因使用这些下载资源对自己和他人造成任何形式的伤害或损失。
最新文档
- 结构力学优化算法:灵敏度分析:结构优化设计方法学
- 元音字母在开闭音节中的发音规律
- 英语教学法教程unitteachingspeaking(共54张课件)
- 公司饭堂天然气使用操作规程
- 做有梦想的少年 课件-2024-2025学年统编版道德与法治七年级上册
- 第37讲+近代西方的商业贸易、城市化进程(课件)-2024年高考历史一轮复习讲练测(新教材新高考)
- 压床护理操作技术
- 外科围手术期的护理
- 第27讲 区域发展对交通运输布局的影响(练习)(原卷版)
- 深圳桐林半山豪宅项目品牌形象广告策划案
- 2024年新青岛版六年级上册(六三制)科学全册知识点
- NB/T 11446-2023煤矿连采连充技术要求
- 秋季开学小学二年级开学第一课主题班会课件
- 部编人教版三年级上册道德与法治全册教案
- 2024年全国保密教育线上培训考试试题库及答案
- 2024年河南省中考数学真题试卷及答案解析
- 老年人体检分析报告及改进措施
- 八年级历史下册期末考试试卷及答案
- 西藏林芝第二高级中学高三压轴卷新高考数学试卷及答案解析
- DZ/T 0434-2023 岩盐钻井水溶开采矿山地质工作规范(正式版)
- 语文 职业模块第二单元教学设计示例(任务二)
评论
0/150
提交评论