轮机长最新轮机英语4647题库汇总(附答案)
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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 crankshaft 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。
3Which of the following statements is correct concerning available astern power for diesel main propulsion systems?Astern power 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, controllable 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 astern.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。
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 engines 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。
8The double bottom in a vessel is a space comprised of ________.plating forming the engine room tank top double 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 preventing 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.Hydraulic.Air.All of the above.C