相关试题
【单选题】
过热器前受热面长时间不吹灰或水冷壁结焦会造成___。
A. 过热汽温偏高
B. 过热汽温偏低
C. 水冷壁吸热量增加
D. 水冷壁吸热量不变
【单选题】
炉膛负压摆大，瞬间负压到最大，一、二次风压不正常降低，水位瞬时下降，气压、气温下降说明此时发生___。
A. 烟道面燃烧
B. 吸、送风机入口挡板摆动
C. 锅炉灭火
D. 炉膛掉焦
【单选题】
水冷壁、省煤器、再热器或联箱发生泄漏时，应___。
A. 紧急停炉
B. 申请停炉
C. 维持运行
D. 节日停炉
【单选题】
发生烟道再燃烧事故，当采取措施无效时应___。
A. 立即停炉
B. 申请停炉
C. 保持机组运行
D. 向上级汇报
【单选题】
随着运行小时增加，引风机振动逐渐增大的主要原因一般是___。
A. 轴承磨损
B. 进风不正常
C. 出风不正常
D. 风机叶轮磨损
【单选题】
风机串联运行的主要目的是___。
A. 提高风压
B. 提高风量
C. 提高效率
D. ／
【单选题】
标准煤的发热量为___。
A. 20934千焦
B. 25120.8千焦
C. 29307.6千焦
D. 12560.4千焦
【单选题】
锅炉三冲量给水自动调节系统中，___是主信号。
A. 蒸汽流量
B. 给水流量
C. 汽包水位
D. 蒸汽压力
【单选题】
风机的工作点是管路特性曲线和风机___的交点。
A. Ｑ－Ｐ特性曲线
B. Ｑ－η特性曲线
C. Ｑ－Ｎ特性曲线
D. /
【单选题】
20号钢的导汽管允许温度为___。
A. ＜450℃
B. ＝500℃
C. ＞450℃
D. /
【单选题】
锅炉煤灰的熔点主要与灰的___有关。
A. 组成成分
B. 物理形态
C. 硬度
D. 可磨性
【单选题】
温度不变时，过热蒸汽的焓随压力增大而___。
A. 增大
B. 减小
C. 不变
D. 先增大后减小
【单选题】
汽包锅炉点火初期是一个非常不稳定的运行阶段，为确保安全，___。
A. 应投入锅炉所有保护
B. 应加强监视调整
C. 应加强联系制度
D. 应加强监护制度
【单选题】
锅炉在正常运行过程中，在吹灰器投入前将吹灰系统中___排净，保证是过热蒸汽，方可投入。
A. 凝结水
B. 汽水混合物
C. 空气
D. 过热蒸汽
【单选题】
在锅炉蒸发量不变的情况下，给水温度降低时，过热蒸汽温度升高，其原因是___。
A. 过热热增加
B. 燃料量增加
C. 加热热增加
D. 加热热减少
【单选题】
就地水位计所指示的水位高度, 比汽包的实际水位高度___。
【单选题】
在监盘时，如看到风机因电流过大，或摆动幅度大的情况下跳闸，___。
A. 可以强行启动一次
B. 可以在就地监视下启动
C. 不应再强行启动
D. 请求领导决定
【单选题】
在允许范围内，尽可能保持高的蒸汽温度和蒸汽压力，则使___。
A. 锅炉热效率下降
B. 锅炉热效率提高
C. 循环热效率提高
D. 汽轮机效率提高
【单选题】
汽水混合物进入旋风分离器的速度越高，汽水分离效果___
【单选题】
汽包锅炉进行超水压试验，压力为汽包工作压力的___
A. 1.1倍
B. 1.25倍
C. 1.5倍
D. 1.2倍
【单选题】
在达到最佳过量空气系数前，增加风量，锅炉机械不完全燃烧损失___
A. 增加
B. 不变
C. 减小
D. 变化不大
【单选题】
风机要求关门启动的原因是：___
A. 减小风压的波动
B. 减小启动时的电流
C. 减小对另一台风机的影响
【单选题】
造成锅炉部件寿命老化损伤的因素，主要是疲劳、蠕变___。
A. 磨损
B. 低温腐蚀
C. 高温腐蚀
D. 腐蚀与磨损
【单选题】
当锅炉负荷突然增大时，汽包水位会___。
A. 上升
B. 下降
C. 先迅速下降后上升
D. 先迅速上升后下降
【单选题】
机组大小修后锅炉应做锅炉水压试验，一般只做___试验。
A. 汽包工作压力
B. 过热器工作压力 C.1.05倍过热工作压力 D.1.08倍过热器压力
【单选题】
壁温小于580℃的过热器管的用钢材为___。
A. 20号钢
B. 15CrMo
C. 12Gr1MoV
D. 2Cr12WMoNbVB
【单选题】
高压锅炉安全门定值的规定是___
A. 控制安全门为额定压力的105%，工作安全门为额定压力的108%
B. 由总工程师确定
C. 控制安全门为额定压力的108%，工作安全门为额定压力的105%
D. 应高于工作压力
【单选题】
锅炉腐蚀除了烟气腐蚀和工质腐蚀外，还有___。
A. 汽水腐蚀
B. 应力腐蚀
C. 硫酸腐蚀
D. 电化学腐蚀
【单选题】
锅炉大小修后的转动机械须进行不少于___试运行，以验证可靠性。
A. 10min
B. 30min
C. 2h
D. 8h
【单选题】
___的特点是挥发分高、含碳量低，易点燃，火焰长。
A. 矸石煤
B. 无烟煤
C. 贫煤
D. 褐煤
【单选题】
在锅炉热效率试验中___工作都应在试验前的稳定阶段内完成。
A. 受热面吹灰、锅炉排污
B. 试验数据的确定
C. 试验用仪器安装
D. 试验用仪器校验。
【单选题】
所有高温管道、容器等设备上都应有保温层，当室内温度在25℃时，保温层表面的温度一般不超过___。
A. 40℃
B. 50℃
C. 60℃
D. 30℃
【单选题】
工作介质温度在540～600℃的阀门属于___。
A. 普通阀门
B. 高温阀门
C. 超高温阀门
D. 低温阀门
【单选题】
物质的温度升高或降低___所吸收或放出的热量称为该物质的热容量。
【单选题】
绝对压力就是___。
A. 容器内工质的真实压力
B. 压力表所指示的压力
C. 真空表所指示压力
D. 大气压力
【单选题】
水在汽化过程中，温度___，吸收的热量用来增加分子的动能。
A. 升高
B. 下降
C. 既不升高也不下降
D. 先升高后下降
【单选题】
一定压力下，水加热到一定温度时开始沸腾，虽然对它继续加热，可其___温度保持不变，此时的温度即为饱和温度。
【单选题】
油品的危险等级是根据___来划分的，闪点在45℃以下为易燃品，45℃以上为可燃品，易燃品防火要求高。
A. 闪点
B. 凝固点
C. 燃点
D. 着火点
【单选题】
泵的扬程是指单位重量的液体通过泵后所获得的___。
A. 压力能
B. 动能
C. 分子能
D. 总能量
推荐试题
【单选题】
Tom is a book lover. ______ likes reading very much.
A. He B. She C. You D. It
【单选题】
—May I listen to the music here, Mr. White?
—Sorry, you’d better it like that．
A. not to do B. not do to
C. dont do D. not do
【单选题】
3.—Did you have a good time at Lauras birthday party?
— Yes, indeed. Its several years ________ I enjoyed myself so much.
A. when B. before C. since D. that
【单选题】
4. —___________ is the Summer Palace from here?
About three kilometers away. You can take the No. 35 bus.
A. How long B. How far C. How often D. How much
【单选题】
5. I was looking for a birthday gift for my mother, but I couldnt find ______ suitable.
A. anything B. something C. nothing D. everything
【单选题】
6. A friend of my ____ and I are going to visit_______ next week．
A. father; Browns B. father's; Browns
C. father; the Browns D. father's; the Browns
【单选题】
7. She ______ very hard since she came to our school.
A. studies B. has studied C. is studying D. studied
【单选题】
8. — Who will send you to the new school, your mom or your dad?
— _______. Ill go there by myself.
A. Both B. Either C. Neither D. None
【单选题】
9.—Well do what we can ____English well this term．
—It’s high time for you to work hard．
A. study B．to study C. be studied D. be studying
【单选题】
10. —I’m going to Flower Bookstore. Could you tell me ______?
— Sorry, I don’t know. I’m new here.
A. where it is B. where was it C. where is it D. where it was
【单选题】
11. How do you like the dishes, Eric?
— Fantastic! Nothing tastes ________.
A. nice B. better C. terrible D. worse
【单选题】
12. ______ Lin Feng has to work late, she always wears a smile on her face.
A. Because B. If C. Until D. Though
【单选题】
13.You can save money _______ you buy cheaper things.
A. before B. unless C. if D. until
【单选题】
14. We will have a _________ holiday after the exam．
A. two-month B. two month’s C. two month D. two-months
【单选题】
15. —We will build an underground in Xuzhou before 2015．
— Wow, _______! Will it pass our place?
A. what an excited news B. how excited the news is
C. what exciting news D. how exciting
【单选题】
16. — Emily, here’s a dictionary．I hope it will help you in some way．
— Thank you．It’s ________ what I need．
A. almost B. still C. only D. just
【单选题】
17. —Oh．I’m hungry．Mum, can I have the hamburger on the plate?
—No．It tastes ．
A. terribly B. terrible C. good D. well
【单选题】
18. —We can invite our teachers to the farewell party next Saturday.
—Yes, ______? I’ll call them at once.
A. what for B. what C. why not D. why
【单选题】
19.You can ________ ask the old man to move away to any other place because he has lived ________ here for at least sixty years．
A. hardly; alone B. hard; alone
C. hardly; lonely D. hardly; lonely
【单选题】
20.—I’m going back to see my grandparents this weekend．
—________．
A. It’s very nice of you B. You’d better hurry
C. Say goodbye to them D. Give my best wishes to them
【单选题】
21.—Why not take ____ umbrella with the sign “Made in China”? It is useful.
—What _______ good advice it is!
A. an; a B. a; a C. an; \ D. \; a
【单选题】
22. —Do you know the boy________ is sitting next to Peter?
— Yes. He is Peter’s friend. They are celebrating his ________ birthday.
A. who; ninth B. that; ninth C. /; ninth D. which; ninth
【单选题】
23. It was dark, ______ I couldnt see what was happening.
A. or B. though C. but D. so
【单选题】
24.—You can use MSN to talk with Vivien on the Internet.
—I know. But can you tell me ________?
A. what I can use it B. when I can use it
C. why can I use it D. how can I use it
【单选题】
25. _______ are you going to the School Uniform Exhibition, Amy ?
To learn about different styles of school uniform.
A. What B. Where C. Which D. Why
【单选题】
( ) 26. Where does the writer of "The little Prince" come from?
A．England． B．France． C．America． D．China．
【单选题】
( ) 27. What does the prince do after the fox tells him a secret?
A．He cares more about a flower and a sheep．
B．He meets many more strange adults on other planets．
C．He realizes his love for the rose and he goes back to his planet．
D．He discovers interesting things such as a snake, other roses and a fox
【单选题】
( ) 28. What does "The little Prince" mainly talk about? It' s about _________．
A．the adult world B．the planet B -612
C．a rose and a fox D．the adventure of a young prince
【单选题】
( ) 29. What is the writer's main purpose（目的）in writing this passage？
A．To tell the readers his life story．
B．To tell people what kind of person his father was．
C．To tell the readers what present he got from his father．
D． To let people know how poor he was．
【单选题】
( ) 30. Why did the father not ask his son not to do this and do that？
A．Because he felt quite confident of his son．
B．Because he was born from a poor family．
C．Because he was a man of few words．
D．Because he didn't want to be much too strict with his son．
【单选题】
( ) 31. What would someone learn from this passage？
A．How to live by oneself． B．How to stand on one's own feet．
C．What a good father should do． D．What the self-important is like．
【单选题】
( ) 32. What may be the proper Chinese for the underlined part in the passage？
A．闲暇时光 B．学费 C．精神空虚 D．经济不足
【单选题】
( ) 33. Why did Natalie Smith pay for the six cars behind her?
A. She had seven tickets.
B. She hoped to please others.
C. She knew the car drivers well.
D. She wanted to show kindness.
【单选题】
( ) 34. Judy Foreman copied down the phrase because she ___ .
A. thought it was beautifully written
B. wanted to know what it really meant
C. decided to write it on a warehouse wall
D. wanted her husband to put it up in the classroom
【单选题】
( ) 35. Who came up with the phrase according to the passage?
A. Judy Foreman. B. Natalie Smith. C. Anne Herbert D. Alice Johnson.
【单选题】
( ) 36. What can we infer from the last paragraph?
A. People should practice random kindness to those in need.
B. People who receive kindness are likely to offer it to others.
C. People should practice random kindness to strangers they meet.
D. People who receive kindness are likely to pay it back to the giver.
【单选题】
( ) 37.The greatest river for navigation is ___________.
A. the Nile B. the Amazon C. the Mekong D. the Mississippi
【单选题】
( ) 38. From a dam, people can use the water for ___________.
A. keeping the rivers clean B. only making electricity
C. irrigation and making electricity D. washing clothes
【单选题】
( ) 39. The water in the river is polluted because of _____________.
A. people's drinking water too much B. people's swimming in the river too much
C. chemicals and other materials D. people's building a dam across a river
【单选题】
( ) 40. The best title of the passage is ___________.
A. Rivers in Cities B. The importance of Rivers
C. Transportation D. Natural Resources
