标题：轮机英语考证学习指南
简介
《轮机英语考证学习指南》内容简介
本书是根据《海员培训、发证和值班标准国际公约》、《中华人民共和国海事局2006年海船船员适任考试和评估大纲》要求编写的。
本书是专为轮机英语考证和英语评估而作，完全是为广大船员和航海院校在校生顺利通过海船船员适任证书轮机英语考试和评估而编写的。
全书分为两部分：第一篇轮机英语考证指南，第二篇轮机英语评估指南。
轮机英语考证指南是根据最新版的轮机英语考证题目，按照新编的海船船员适任考试培训教材《轮机英语》课文的内容编排相应的考证题，便于教学和同步学习训练。每个题目都附有翻译注释；书中及软件学习系统附有课文和考证题的部分生词及短语，方便查阅。另外该篇还附有一部分关联题及注释。轮机英语评估指南按照新编《轮机英语听力与会话》（第三版）中每一章的问答题和口述题编写了参考答案，方便学生和船员的评估练习。
本书还配套了与机考界面完全一致的功能强大的智能化学习训练软件，针对性很强。本书及配套的学习训练软件完全按照考证和评估培训的需要进行编写，非常方便实用，真正做到：一册在手，考证无忧！ 
目录
本书部分目录
本书清样
第一篇轮机英语考证指南
Unit 1
§ L1
0001. The auxiliary engine and a.c. generator can be connected with _____.
A. cam       B. crosshead        C. bulge       D. coupling
注： 副机和发电机用联轴节连接，故选D。
0002. The term medium speed diesel engine is currently taken to mean an engine with an operating rotational speed of _____ rpm.
A. below 300      B. above 1200      C . between 300 to 1200      D. below 1200
注： 术语“中速机”是指运行速度介于300-1200 rpm之间的发动机。（也有说法为300-1000 rpm），只能选C，故选C。
0003. The rotating range of the low speed diesel engine is usually lower than _____.
A. 100 rpm       B. 200 rpm       C. 300 rpm       D. 500 rpm
注： 术语“低速机”是指运行速度小于300rpm的发动机，故选C。
0004. Among the main propulsion units on board the ship with the same capacity, the lightest one is_____.
A. steam engine       B. steam turbine       C. gas turbine       D. diesel engine
注： 船舶使用的各种类型的主推进装置中，如果产生的功率相同，装置重量最轻的是燃气
轮机。（比功率大是燃气轮机的优点，同样功率，内燃机中重量最轻，体积也最小。）故选C。
0005. Concerning diesel propelled vessels, the astern power is to provide for continuous operation astern _____.
A. equal to that available for ahead operation
B. at 70 percent of the ahead rpm at rated speed
C. while underway and under all normal conditions
D. at 70 percent of the ahead rpm of average continuous sea speed
注： 柴油机驱动的船舶，倒车转速一般是正车额定转速的70％～80％，故选B。
0006. A diesel engine is operating at 1800 RPM and driving a propeller at 600 RPM. What is the speed reduction ratio?
A. 0.30 to 1       B. 3.00 to 1       C . 3.33 to 1       D. 33.0 to 1
注： 减速齿轮箱的减速比=曲轴转速／螺旋桨转速=1800／600=3，故选B。      
0007. Engine displacement is equal to the cylinder _____.
A. area times the stroke         B. area times the stroke, times the number of cylinders
C. volume times the stroke      D. volume times the stroke, times the number of cylinders
注： 发动机的排量=气缸面积×活塞冲程×气缸数目，选B。
0008. In using reduction gears to obtain efficient propeller speeds, _____.
A. they must be located at the after end of the engine
B. they can only be used with one engine at a time
C. they eliminate the need for controllable pitch propellers
D. they are connected to the engine with a flexible coupling
注： 减速齿轮与发动机采用柔性联轴节连接，选D。
0009. Maximum horsepower of a diesel engine is attained _____.
A. when the engine RPM is pulled down by overload
B. at rated engine RPM
C. at 95 % of rated engine RPM
D. at 95 % of a properly adjusted governor RPM with the engine under full load
注： 柴油机的最大功率是在其额定转速时产生的，故选B。
0010*. The term “moderate speed” was previously interpreted as meaning a speed which would enable a vessel ______ within half the range of visibility. 
A. stopping                           B. being stopped
C. to stop                             D. to be stopped 
注： 术语“中等速度”以前被解释为能使船舶在视野的一半距离内被停住的速度。根据题意船舶被停住要使用被动语态，enable后面要跟动词不定式，故选D。
0011. _____ can be found on most medium to large merchant vessels even if the main engine is either a steam turbine or 2-stroke crosshead engine.
A. The medium speed 4-stroke trunk piston engine
B. The low speed 2-stroke crosshead engine
C. The medium speed 2-stroke crosshead engine        
D. The low speed 4-stroke trunk piston engine
注： 即使主机或者是汽轮机，或者是二冲程十字头柴油机，在中到大型的商船上也有采用中速的四冲程筒状柴油机。B中的二冲程机题目中已有，C中的中速二冲程机和D中的低速四冲程机都不对，只有A的中速四冲程机符合题意。故选A。
0012. _____ allows the engine to be placed wherever is most suitable, as they no longer have to be aligned with reduction gearing and shafting as is the case with conventional installations.
A. Diesel engine propulsion         B. Diesel electric propulsion         
C. Steam engine propulsion         D. Gas turbine propulsion
注： 柴油电力推进可以使主机布置在最合适的位置，而不用像传统的推进装置要求与减速齿轮和轴系对中。根据题意选B。Diesel electric propulsion指柴油电力推进。
0013. Medium speed engines have a _____ power to weight ratio than the slow speed two strokes, but due to the higher speeds tend to have _____ maintenance intervals. 
A. higher/reduced                 B. higher/increased  
C. lower/reduced                  D. lower/increased
注： 中速机比低速二冲程机的功率重量大，但由于速度高，检修周期较短。故选A。
0014. The diesel engine is similar to the gasoline engine in that ______. 
A. both of them are ignited by compressed air 
B. both of them are the forms of external combustion engines 
C. both of them have spark plugs 
D. the power is developed by the piston in the cylinder 
注： 柴油机类似汽油机在于功率都是由气缸里的活塞产生的。故选D。
0015. The reason why more and more of the large merchant vessels are being powered by medium-speed diesel engines is ______. 
A. they operate between 150 and 450 rpm 
B. they are connected to the propeller by gearing 
C. their smaller size and weight   
D. they can be connected directly to the propeller without gearing
注： 越来越多的大型商船以中速柴油机为动力的原因是它们的尺寸小、重量轻。故选C。