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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1On a large diesel engine installation, crankshaft axial alignment is maintained by the _.piston rod guidesengine thrust bearingcrosshead bearingmain shaft flexible couplingB在大型柴油机安装中，曲轴靠推力轴承保持轴向对中。2A diesel engine which is rated for normal operation at a crankshaft speed
2、of 800 rpm, is commonly classed as a _.slow-speed dieselmedium-speed dieselhigh-speed dieselconstant-speed dieselB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。3Which of the following statements is correct concerning available astern power for diesel main propulsion systems?Astern power is to be provided in a suff
3、icient 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, controllable pitch propellers or
4、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况下能够对船舶进行适当的控制。4When two medium spe
5、ed 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 astern. Full reversing torque is not avai
6、lable.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。5Which 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 pistons.Single reduction gearing.A低速二冲程主推进柴油
7、机普遍采用十字头结构。6A disadvantage of a two-stroke/cycle diesel engine is _.more power strokes per revolutionthe use of scavenge airmore complicated valve gearhigher working temperatures of the piston and cylinderD二冲程柴油机的缺点是气缸头的温度高。7In comparing engines of equal horsepower, higher exhaust gas temperatures o
8、ccur in a/an _.opposed-piston enginedouble-acting enginetwo-stroke/cycle enginefour-stroke/cycle engineD与相同马力的柴油机相比，四冲程柴油机的废气温度高。8The double bottom in a vessel is a space comprised of _.plating forming the engine room tank topdouble plating installed over the flat keel platea watertight boundary for
9、med by the inner bottomcompartments between the inner and outer bottomsD船的双底壳是由内外两层构成的。9A water jacket is placed around the exhaust manifolds of propulsion diesel engines to _.reduce heat radiation to the engine roomaid in preventing turbocharger overheatingcondense and drain moisture from exhaust g
10、asesdampen exhaust gas pulsations in the manifoldA环绕排气总管的水套是为了减少对机舱的热辐射。10Which of the listed types of staring systems is often used on large, low speed, direct reversing, main propulsion diesel engines?Electric.Hydraulic.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。11The over-speed trip installed on
11、 most diesel engine will stop the engine by shutting off the _.water supplyfuel oil supplylube oil supplyexhaust damperB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。12In a common rail system, excessive pressure in the header may be caused by _.improper adjustment of the bypass valvea dribble in the fuel inject
12、ion nozzleinsufficient leak-off through injection nozzle packinga malfunctioning injection nozzleA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。13Diesel engine electric starting motors generally require heavier duty motors and operaste at higher voltages than comparable starting motors for gasoline engines due
13、 to _.higher speed requiredflywheel-effectlower starting temperatureshigher compression pressuresD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。14When used with reversing reduction gears, medium-speed diesel engines should be bolted to their foundations with fitted bolts at the drive end and clear
14、ance (loosely fitted) bolts in other locations. This is done to _.maintain alignment when the ships hull is working in heavy seasensure engine vibrations correspond to the natural frequency of the hullpermit the engine to expand away from the driven equipment as the engine heats up and expandsmainta
15、in engine thrust bearing clearancesC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。15A diesel engine with a combustion chamber located between the crowns of two pistons is known as a / an _.double-acting engineopposed pistons enginesingle-acting enginehorizontal acting engineB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”。16In using reduction gears to obtain efficient propeller speeds, _.they must be located at the after end of the enginethey can only be u
