问题 问答题 论述题

同步发电机的拆卸应做好哪些准备工作?

答案

参考答案:

为了便于对发电机进行全面的检查和修理,每次大修时都必须把发电机拆开,并从转子膛内抽出转子。因此,同步发电机的拆卸是大修的重要环节,必须做好充分的准备工作,才能使解体检修有条不紊地进行。

(1)查阅档案,了解发电机的运行状况:

①查阅运行记录,了解上次大修投运以来所发现的缺陷和事故情况、原因分析、已采取的措施和尚存在的问题;②查阅上次大修和历次小修的总结报告和技术档案,了解对本次大修的意见;③进行大修前的试验,确定附加检修项目。

(2)编制大修施工计划。其主要内容包括:①人员组织及分工;②检修项目及进度表;③重大特殊项目的施工方案;④确保施工安全、质量的技术措施和现场防火措施;⑤主要施工工具、设备明细表、主要材料明细表;⑥绘制必要的施工图纸。

(3)施工场地和工具的准备:①清扫施工现场,并做好防潮、防尘和消防措施,准备充足的施工电源及照明;②检查专用搁架、托架、弧形垫块等是否完好和齐全,并将转子专用搁架按所需间距及位置放置在合适的检修场所;③检查专用起用工具如钢丝绳、起吊行车、电动葫芦、滑车、倒链等,应完好、齐全;④准备好检修材料、备品、备件、工具等。

单项选择题
阅读理解

In the course of working my way through school, I took many jobs I would rather forget. But none of these jobs was as dreadful as my job in an apple plant. The work was hard; the pay was poor; and, most of all, the working conditions were terrible.

First of all, the job made huge demands on my strength. For then hours a night, I took boxes that rolled down a metal track and piled them onto a truck. Each box contained twelve heavy bottles of apple juice. I once figured out that I was lifting an average of twelve tons of apple juice every night.

I would not have minded the difficulty of the work so much if the pay had not been so poor. I was paid the lowest wage of that time—two dollars an hour. Because of the low pay, I felt eager to get as much as possible. I usually worked twelve hours a night but did not take home much more than $ 100 a week.

But even more than the low pay, what made me unhappy was the working conditions. During work I was limited to two ten-minute breaks and an unpaid half hour for lunch. Most of my time was spent outside loading trucks with those heavy boxes in near-zero-degree temperatures. The steel floors of the trucks were like ice, which made my feet feel like stone. And after the production line shut down at night and most people left, I had to spend two hours alone cleaning the floor.

I stayed on the job for five months, all the while hating the difficulty of the work, the poor money, and the conditions under which I worked. By the time I left, I was determined never to go back there again.

49. Why did the writer have to take many jobs at that time?

A. To pay for his schooling.

B. To save for his future.

C. To support his family

D. To gain some experience

50. The following facts describe the terrible working conditions of the plant EXCEPT ______.

A. loading boxes in the freezing cold                     B. having limited time for breaks

C. working and studying at the same time        D. getting no pay for lunch time

51. What is the subject discussed in the text?

A. The writer’s unhappy school life.               B. The writer’s eagerness to earn money.

C. The writer’s experience to earn money.      D. The writer’s hard work in an apple plant.

52. How is the text organized?

A. Topic—Argument—Explanation

B. Opinion—Discussion—Description

C. Main idea—Comparison—Supporting examples

D. Introduction—Supporting examples—Conclusion