轮机长用最新轮机英语4647题库~汇总.doc
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1、|编号 问题 选择 A 选择 B 选择 C 选择 D 答案 注解1 “On a large diesel engine installation, crankshaft axial alignment is maintained by the _.“ piston rod guides engine thrust bearing crosshead bearing main shaft flexible coupling B 在大型柴油机安装中,曲轴靠推力轴承保持轴向对中。2 “A diesel engine which is rated for normal operation at a c
2、rankshaft speed of 800 rpm, is commonly classed as a _.“ slow-speed diesel medium-speed diesel high-speed diesel constant-speed diesel B 曲轴转速 800 转分以额定功率正常运行的柴油机称 为中速柴油机。3 Which of the following statements is correct concerning available astern power for diesel main propulsion systems? Astern power
3、is to be provided in a sufficient amount to secure proper control of the ship in all normal circumstances. The astern power of the main propelling machinery is to provide for continuous operation astern at 60% of the ahead rpm at rated speed.“For main propulsion systems without reversing gears, cont
4、rollable pitch propellers or electric propulsion drive, running astern is not to lead to overload conditions.“ “Astern power available will be equal to ahead power when controllable pitch propellers are utilized, thus discounting the need for increased operating parameters.“ A 倒车功率必须能提供足够的功率确保在各种正常情
5、况下能够对船舶进行适当的控制。4 “When two medium speed diesel engines coupled in parallel to a common propeller shaft that operates at the same speed as the engines, which of the operating conditions listed will apply?“Full horsepower is available ahead and astern. One engine must be running ahead and the other as
6、tern. Full reversing torque is not available. Mechanical reduction gearing is required.D 当两台中速柴油机并排连接到同速运转的普通螺旋桨轴上,需要机械减速装。5 Which of the listed design features is most common to a two-stroke/cycle low-speed main propulsion diesel engine? Crosshead construction. Cross-scavenging air flow. Trunk type
7、 pistons. Single reduction gearing. A 低速二冲程主推进柴油机普遍采用十字头结构。6 A disadvantage of a two-stroke/cycle diesel engine is _. more power strokes per revolution the use of scavenge air more complicated valve gear higher working temperatures of the piston and cylinder D 二冲程柴油机的缺点是气缸头的温度高。7 “In comparing engin
8、es of equal horsepower, higher exhaust gas temperatures occur in a/an _.“ opposed-piston engine double-acting engine two-stroke/cycle engine four-stroke/cycle engine D 与相同马力的柴油机相比,四冲程柴油机的废气温度高。8 The double bottom in a vessel is a space comprised of _. plating forming the engine room tank top double
9、plating installed over the flat keel plate a watertight boundary formed by the inner bottom compartments between the inner and outer bottoms D 船的双底壳是由内外两层构成的。9 A water jacket is placed around the exhaust manifolds of propulsion diesel engines to _. reduce heat radiation to the engine room aid in pre
10、venting turbocharger overheating condense and drain moisture from exhaust gases dampen exhaust gas pulsations in the manifold A 环绕排气总管的水套是为了减少对机舱的热辐射。10 “Which of the listed types of staring systems is often used on large, low speed, direct reversing, main propulsion diesel engines?“ Electric. Hydra
11、ulic. Air. All of the above. C|大型低速可逆转主推进柴油机使用空气起动系统。11 The over-speed trip installed on most diesel engine will stop the engine by shutting off the _. water supply fuel oil supply lube oil supplyexhaust damper B 大多数柴油机安装的超速保护(停车)装置通过切断燃油供油使发动机停车。12 “In a common rail system, excessive pressure in th
12、e header may be caused by _.“improper adjustment of the bypass valve a dribble in the fuel injection nozzle insufficient leak-off through injection nozzle packinga malfunctioning injection nozzle A “在共轨燃油喷射系统中,集油管压力过大可能是由于旁通阀调节不当而造成的。“13 Diesel engine electric starting motors generally require heavi
13、er duty motors and operaste at higher voltages than comparable starting motors for gasoline engines due to _. higher speed required flywheel-effect lower starting temperatures higher compression pressures D因为要更高的压缩压力,柴油机电起动马达与类似的汽油机的起动马达相比,要有更大的功率和更高的电压。14 “When used with reversing reduction gears,
14、medium-speed diesel engines should be bolted to their foundations with fitted bolts at the drive end and clearance (loosely fitted) bolts in other locations. This is done to _.“ maintain alignment when the ships hull is working in heavy seas ensure engine vibrations correspond to the natural frequen
15、cy of the hull permit the engine to expand away from the driven equipment as the engine heats up and expands maintain engine thrust bearing clearances C 当与倒车减速装置一起使用时,中速柴油机应该在传动端用装配螺栓与底座连在一起,而在其它地方则用间隙螺栓固定,这样可使柴油机热膨胀时留有膨胀余地。15 A diesel engine with a combustion chamber located between the crowns of t
16、wo pistons is known as a / an _. double-acting engine opposed pistons engine single-acting engine horizontal acting engine B 柴油机的燃烧室介于两个活塞之间,这种发动机称为“对置活塞式柴油机” 。16 “In using reduction gears to obtain efficient propeller speeds, _.“ they must be located at the after end of the engine they can only be
17、used with one engine at a time they eliminate the need for controllable pitch propellers they are connected to the engine with a flexible coupling D 减速齿轮与发动机采用柔性联轴节连接。17 “For a given size engine, the two-stroke / cycle diesel engine will deliver more power than a four-stroke / cycle diesel engine be
18、cause _.“ it has a longer power stroke more air gets into the cylinder each stroke it develops twice as many power strokes at the same speed higher combustion pressure is developed C 理论上,二冲程柴油机发出的功率是相同四冲程柴油机的两倍。18 The minimum speed an engine must attain before ignition can occur depends upon _.the t
19、ype and size of the engine the condition of the engine ambient temperature all |of the above D 发动机发火之前必须获得的最低转速取决于发动机的类型和尺寸、发动机的状态和环境温度等因素。19 “In a diesel engine, internal combustion causes the piston to be moved by _.“ the simple admission of fuel and air into the combustion space only the pressure
20、 of gases developedspecially designed parts connected to a shaft the concept of reciprocity B 在柴油机工作时,内部燃烧引起活塞被燃气压力驱动。20 Diesel engines are classified as reciprocating internal combustion engines because they _. use energy from fuel burned outside their cylinders burn fuel in a combustion chamber th
21、at moves back and forth burn fuel in a chamber where its energy moves a piston back and forth use a continuous combustion process to impart rotary motion to the pistons C把柴油机归类于往复式内燃机,是因为燃油在燃烧室内被燃烧,产生能量使活塞作往复运动。21 A main propulsion diesel engine is normally shut down by _.shutting off the air supply
22、 over-speeding the engine securing the fuel supply securing the ignition system C主推进柴油机是通过切断燃油供应实现停车的。22 The thermal energy produced by an internal combustion engine is transformed into _.combustion energy internal energy external energy mechanical energy D 内燃机产生的热能转换成机械能。23 Maximum horsepower of a
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