轮机英语听力与会话三版口述和问答题答案
第一章
口述
1． The engine room is the heart of a ship. It is generally located at the stern near the ship bottom. In the engine room, there are a lot of machinery and systems, such as the main engine, the generater engine, boilers, pumps, the refrigerating system, and the air conditioning system. The main engine, also called the main propulsion plant，申诉成功凭证is the largest and most important one . The modern improvement of control systems results in machinery space remaining unattended for long periods. That is UMS.
第二章
口述
美术绘画图片1. The main difference between the diel engine and the gasoline engine include: 1) the c
ombustion medium of a diel engine is diel oil or fuel oil, while that for a gasoline engine is gas oil. 2) the diel engine is ignited through compression of hot, high pressure oil/air mixture, but the gasoline engine is ignited by electrical spark plug. 3) for diel engine, the air and oil is mixed inside the cylinder, while for gasoline engine, they are mixed outside the cylinder.
2. First, I will tell the cadet the importance the engine room. Second, I should introduce the various machinery and systems in the engine room, such as the main engine, the generater engine, boilers, pumps, the refrigerating system, and the air conditioning system. Third, I will show him how to operate the various equipment and devices safely, and introduce as much safety knowledge as I can.
3. same as question No 2.
4. The power of the diel engine is transmitted to the propeller through the transmission system. The items of transmission system include various shafts, such as the thrust shaft, one or more intermediate shafts and tail shaft. The shafts are supported by the t
hrust block, intermediate bearings and the sterntube bearing. The propeller consist of a boss with veral blades,. The thrust is transmitted along the shafting to the thrust block and finally to ship structure.
温泉记5. When the ship is sailing at full speed, it need four engines running . When the ship is sailing at half speed, it require two engines running. While the ship is operating at about 30 % of full speed, one engine is enough to meet its power requiement. That is, the ship can be operated with single engine, double engines, or four engines according the load condition.Generally, when the ship is sailing at a speed, it has four engin running,whie it approaches the wharf, it has two.做甜品
6. The structure of the main engine is as follows: the construction mainly include bedplate, frame, cylinders, pistons, connecting rod, main bearing and crankshaft. The crankshaft rests in main bearings built into cross girders of the bedplate. On the top of A frames there is a scavenging air box. The bedplate, frames and cylinder blocks are cured together by long tie-rods. A piston consists of a lower part called piston skirt and an upper part called piston crown.
7. The moving parts shown in the illustration mainly include the piston, the connecting rod, and the crankshaft. The are all critical parts of the engine. According to the specific condition shown in the picture, the piston is under compression force, the connecting rod is under tension stress and compression force, while the crankshaft is under the torsion forces.
8. Pistons can be divided into two main class: the crosshead type pistons and the trunk type pistons. The top surface of the crosshead piston can be flat, sunken or convex. The piston shown in the illustration is the crosshead type piston with a sunken surface. It has the advantage of increasing the air turbulance and imporvingthe oil/air mixing quality. Its disadvantage is that the cylinder volumetric clearance will be larger.
9. The piston rings shown in the illustration has the shape of rectangle or trapezoid. Some of them are rounded on the external top or bottom edges. Among the piston rings, No.1 and No.2 are aling rings, No. 3 and No. 4 are scraper rings, while the No.5 is a distributor ring. Generally, each piston is provided with five or six piston rings.
10. Large marine diel engines of crosshead construction generally have two systems of lubrication: a totally loss system feeding the cylinders and a circulating system lubricating the running gear and cooling the pistons. Oil is supplied to the cylinder liner wall and piston rings by means of mechanical lubricators. The lube oil to the varoius moving parts enable the formation of an oil film which reduces friction and wear.
三．爱大家A
麦包包淘宝商城1 关于担当的名言朱砂梅In order to ensure the safe navigation of the ship, frequent communication between the engineers and officers is necessary. The usual means of communication is by telephone and telegraph. If the communication between the engine room and the bridge fails, the ship will be endangered. The records of communication should be maintained which will provide evidence in the event of an accident at a. Noon report is also a good means of communication between the engine room and the bridge.
