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9.HXD3电力机车牵引电动机用冷却风机:采用___风扇、惯性分离过滤器对应必要的风量和静压增量、外框和叶片的间距变大防止冻结、防止噪音。
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相关试题
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10.HXD3电力机车为消除煤粉等大颗粒尘埃进入,惯性分离过滤器的基础上,在车顶的进气部追加___。
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11.HXD3电力机车主电路主要由网侧电路、主变压器、___及牵引电动机等组成。
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12.HXD3电力机车高压隔离开关隔离位后,通过___发出指令来控制相应的电空阀,实现高压隔离开关的开闭操作,以切除故障的受电弓。
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13.HXD3电力机车避雷器 F1用以抑制操作过电压及___过电压。
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14.HXD3电力机车避雷器F1接在主断路器QF1和高压___TA1之间。
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15.HXD3电力机车设置高压接地开关 QS___,来实现机车的高压安全互锁。
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16.HXD3电力机车正常运行时,需要将高压接地开关 QS10 置___位,此时 QS10 的接地端与车顶回路断开。
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17.HXD3电力机车蓝色钥匙拔出并插入管路柜上的升弓气路阀,保证受电弓的___连通。
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18.HXD3电力机车确认只有主牵引回路一点接地, 也可将控制电器柜上对应的接地开关打至___位,继续维持机车运行。
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19.HXD3电力机车每组牵引变流器的输出回路中,设有输出电流互感器CTU、CTW,对牵引电机过载及牵引电机___起控制和监视保护作用。
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20.HXD3电力机车上的各辅助电动机均通过各自的___与辅助变流器连接。
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21.HXD3电力机车空气压缩机的起动受___的控制。
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22.HXD3电力机车压缩机控制回路里,设有温度保护开关TS-1和___保护开关PS-1,通过其常闭连锁,实现对压缩机的安全保护。
【填空题】
23.HXD3电力机车采用带有中梁的、___承载的框架式车体结构,有利于提高车体的强度和刚度。
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24.HXD3电力机车转向架二系采用___螺旋弹簧。
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25.HXD3电力机车转向架采用整体轴箱、推挽式___等技术。
【填空题】
26.HXD3电力机车在网压22.5kV~31kV之间时,机车能发挥___功率。
【填空题】
27.HXD3电力机车大功率牵引电动机设置有___的轴流通风机。
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28.HXD3电力机车牵引通风机设在机车机械室地板支架上,由___向主电动机送风。
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29.在HXD3电力机车Ⅱ端机械间考虑到空气流动以及功能等问题,集中设置了空压机、空气干燥器、___、空气管路柜等设备。
【填空题】
30.在HXD3电力机车两端的顶盖上设置主电机冷却风___。
【填空题】
31.HXD3电力机车复合冷却器是由油冷和___两种方式构成。
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32.HXD3电力机车复合冷却器用冷却风机从___进气→向车外排气。
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33.HXD3电力机车主变流器的中间直流电路主要由, 中间电压支撑电容、瞬时过电压限制电路和___电路组成。
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34.HXD3电力机车的牵引逆变器是由IGBT元件组成的___逆变单元。
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35.HXD3电力机车每组牵引变流器的输入回路中,设有1个输入电流互感器ACCT,起控制和监视变流器充电电流及牵引绕组___电流的作用,其动作保护值为1960A。
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36.HXD3电力机车主变压器牵引绕组过流保护发生时,四象限脉冲整流器和逆变器的门极均被___,输入回路中的工作接触器断开,同时向微机控制系统发出跳主断信号。
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37.HXD3电力机车主牵引回路正常时,由于只有___点接地,接地保护电路中流过的电流为零,接地信号检测传感器无信号输出。
【填空题】
38.HXD3电力机车机车粘着控制:包括防空转.防滑行控制.轴重转移___控制。
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39.HXD3电力机车司机电钥匙开关SA49(SA50)有两个位置:“合”、“分”,当置“合”位置时,该机车操纵室即被设定为___。
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40.HXD3电力机车紧急制动按钮SA103(SA104)为___按钮。
【填空题】
41.CCBⅡ制动机送入TCMS的801动力切除信号:即制动机要求TCMS控制牵引变流器___功率输出。
【填空题】
42.HXD3电力机车主变流器低压试验前,应将主变流器试验开关SA75置___位。
【单选题】
HXD1电力机车每节车有___个相互独立的主传动变流系统和辅助变流系统。
A. 1
B. 2
C. 3
【单选题】
HXD1电力机车主变流器从主变压器次边取电,通过___个四象限斩波器(4QC)向两个独立的中间电压直流环节供电。
A. 2
B. 3
C. 4
【单选题】
HXD1电力机车每节车辅助变流系统由___个相同PWM逆变器组成,为机车的辅助设备供电。
A. 1
B. 2
C. 4
【单选题】
HXD1电力机车是一种___轴双节重联重载交流传动电力机车。
A. 4
B. 6
C. 8
【单选题】
HXD1电力机车转向架,采用___,构架强度高,结构合理,适合于重载牵引。
A. 侧向牵引梁
B. 低位牵引杆
C. 轴箱拉杆
【单选题】
HXD1电力机车基础制动采用___制动。
A. 轮盘
B. 闸瓦
C. 电磁
【单选题】
HXD1电力机车主变流器采用___冷IGBT模块。
A. 风
B. 水
C. 油
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Good morning, John. How are you doing?___
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How do you do?___
A. Fine, thank you.
B. How do you do?
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D. Very well.
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Good-bye for now.___
A. The same to you.
B. That's OK
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D. Long time no see.
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Hello, how are you?___
A. Hello, how are you?
B. How do you do?
C. Fine, thank you.
D. That's OK.
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I didn't mean to do that. Please forgive me。___
A. Not too bad.
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Thank you for your invitation.___
A. It doesn’t matter.
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What a beautiful dress you have on today!___
A. It is suitable for me.
B. No, it isn’t.
C. You want to have one, too?
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I think he is a good lecturer.___
A. Sorry, it doesn’t matter.
B. So do I.
C. Yes. It's a good idea
D. I don't mind
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— What's the matter, dear?___
A. I didn't go to school.
B. I have a terrible headache.
C. I took the kids shopping today.
D. It is a beautiful dress.
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Good morning, may I speak to Mark, please?___
A. Who's there?
B. Who's that speaking?
C. Who are you?
D. Who wants to speak to Mark?
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Let me introduce myself. I'm Steward.___
A. What a pleasure.
B. Pleased to meet you.
C. I don't know.
D. Thanks a lot.
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Let's go to the library this afternoon.___.
A. Yes, that's right.
B. No. I can't.
C. What about you?
D. That's a good idea.
【单选题】
What does Tom's wife do for a living?___.
A. She is a doctor.
B. Tom loves his wife.
C. She has a happy life.
D. She lives far from here.
【单选题】
How tall is your sister?___
A. She is not very well.
B. She is 28 years old.
C. She is very nice.
D. She is as tall as I am.
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What do you think of this novel?___
A. I've read it.
B. It's well-written.
C. It was written by my uncle.
D. I bought it yesterday.
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How much is this necklace?___
A. It's very nice.
B. It's a birthday present from my parents.
C. It costs fifty pounds.
D. It's a bargain.
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How can I get to the cinema?___
A. It's very far.
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C. It's well known.
D. Go down this street and turn left.
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What's the matter, John?___
A. I failed my French test
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C. Nothing's wrong with him.
D. I don't think I can.
【单选题】
What are you majoring in?___
A. In a university.
B. Very hard.
C. Mathematics.
D. At nine in the morning.
【单选题】
Are you going on holiday for a long time?___
A. It was a long time.
B. Two weeks ago.
C. No. Only a couple of days.
D. Not long time ago.
【单选题】
Is Mary there?___
A. Speaking.
B. I'm not Mary.
C. Who are you?
D. Mary is well today.
【单选题】
What day is today?___
A. It's March 6.
B. It's a fine day today.
C. It's March.
D. It's Monday.
【单选题】
Is that seat taken?___
A. Please don't worry.
B. I don't think so.
C. Why not?
D. It's very nice.
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Thank you for calling.___
A. Don’t mention it.
B. That's fine.
C. Nice talking to you.
D. Call back again.
【单选题】
How are you getting on today?___
A. Very well.
B. How do you do?
C. I'm a doctor.
D. Nice to have known you.
【单选题】
How's your family?___
A. Thanks all the same.
B. Thanks for calling.
C. Not too bad.
D. Don't mention it.
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- How is it that you are late for class again?___
A. Because I missed the bus
B. By bus and then on foot
C. Yes, it is quite wrong
D. It is far from school
【单选题】
- Excuse me. Could you spare me a few minutes? - ___
A. Of course.
B. Of course not.
C. I am sorry to hear that.D.Yes. I'm busy now.
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- It's very thoughtful of you to give me a ride. ___
A. It's my pleasure.
B. Take it easy.
C. Sure.
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【单选题】
- This is heavy! What's in it? ___
A. I think you don't like it.
B. My new computer. I just bought it.
C. I'm glad you're here.
D. Are you really interested in it?
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___ I'd like to place an order please.
A. Can I help you?
B. I can help you.
C. What are you doing?
D. Why are you doing?
【单选题】
- Do you know the girl over there?___
A. How can I know?
B. Yes, I remember it now.
C. It's Sam, my teacher's daughter.
D. She is a good girl.
【单选题】
- Shall we go out for dinner tonight?____
A. No, you can't.
B. Yes, please.
C. Thank you, I don't want to.
D. Sorry, I have a report to finish.
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- I think the reference book(参考书)is very helpful.____
A. Good idea.
B. So do I.
C. With pleasure.
D. No problem.
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- I wish you success in your career.____
A. You are welcome.
B. I think so.
C. Yes, please.
D. The same to you.
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