轮机英语【大管甲类】

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[问答题]Slow speed diesel engines are large, , especially tall, and heavy and operate on the two-stroke cycle. These are the largest diesel engines ever built. Engine powers up to 100,000 kw are available from a single engine. They are tall to allow for long strokes which improve engine efficiency the large physical allow for long strokes which improve engine efficiency. The large physical size of the engine and components leads to slow rotational speed with speeds up to 300 rpm considered to be slow. For equivalent power output, the two-stroke diesel engine is significantly lighter than its com-parable four-stroke relative. This is most apparent for large power requirements where the two-stroke engine produces much more power for the same weight. Large, slow speed, two-stroke marine diesel engines offer the advantages of: 1. Burning poorer quality, cheaper fuel. 2. Providing large power from a single, less complicated machine comprising fewer individual cylinders and moving parts. 3. Having a low rotational speed allowing them to be directly coupled to the propeller and removing the need for transmission machinery such as clutches and gearboxes etc. 4. Being reversible and thus eliminating the need for reversing gear or controllable pitch propellers.
[单选题]An ammeter should be used to measure ____.
[单选题]At an unsheltered anchorage the chief engineer officer shall consult with the master whether or not to ______.
[单选题]Broken intake valve springs on one cylinder of a diesel engine can cause the engine to ______.
[单选题]Which of the following space may not be provided with bilge pumping system?
[问答题]A piston assembly consists essentially of the piston crown, the skirt, a gudgeon pin and a number of piston rings. The crown is subject to the highest combustion pressure and thermal load. It may also suffer from impingement by the combustion flame if the atomizer spray is defective. Piston crowns are of the dished type to provide a combustion chamber between the piston crown and the cylinder head. To give the desired combustion, the shape of the bowl formed in the crown depends on many factors, including the choice of atomizer spray. The fiat rim of the piston surrounding the dished combustion chamber generally contains cut-out sections to prevent the piston from hitting the inlet and exhaust valves. The piston crown is generally made from high quality, deformation resistant forged steel and contains internal cooling surfaces and the provision for a number of piston rings. The crown may taper slightly in order to allow for thermal expansion while in service. During operation the upper part of the crown becomes hotter than the lower part so it will expand more. Tapering allows a narrow clearance between piston and liner to be maintained.
[单选题]A diesel engine is equipped with an isochronous(同步的) hydraulic governor. A decrease in load will cause the engine speed to ________.
[单选题]In a cartridge-type fuse, the metal element is contained in a _______
[单选题]Which of the following will be the function of lubricating oil used in marine engines?
[单选题]When turning the engine with turning gear, you should keep the indicator cocks ____.
[单选题]To determine the main bearing clearance of a propulsion diesel engine, you should measure the main bearing shell using a ball anvil(砧) outside micrometer and measure the crankshaft journal using a/an _______.
[单选题]What symptom would you think shows that the Freon filter drier has become blocked?
[单选题]At which of the following locations would a duplex pressure gage most likely be located?
[单选题]When would you ground an electric hand tool? ____________________.
[单选题]When two different metals are joined to form a closed circuit and exposed to different temperatures at their junctions ____ which can be used to measure temperature.
[单选题]The symbol (GB786.1-93) at right side represents_____
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第一章 船舶主推进装置
第二章 船舶辅助机械
第三章 船舶电气和自动化
第四章 船舶轮机管理业务
第五章 国际公约、规则
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