【单选题】
中小容量的高压电容器组如配置___,动作电流可取电容器组额定电流的2-2.5倍。
A. 过电流保护
B. 电流速断保护
C. 差动保护
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相关试题
【单选题】
外部过电压,与气象条件有关,又称为___。
A. 气象过电压
B. 大气过电压
C. 污秽过电压
【单选题】
35~110kV线路电缆进线段为三芯电缆时,避雷器接地端应与电缆金属外皮连接,其末端金属外皮应___。
A. 对地绝缘
B. 经保护器接地
C. 直接接地
【单选题】
一般隔离开关没有灭弧装置,不允许它___分、合闸操作。
A. 空载时进行
B. 母线切换
C. 带负荷进行
【单选题】
填写工作票时要字体规范,字迹清楚,不得涂改和不得用___笔填写。
【单选题】
电压互感器二次回路允许有___接地点。
【单选题】
下列关于高压阀型避雷器特点描述正确的是___。
A. 串联的火花间隙和阀片多,而且随电压的升高数量增多
B. 并联的火花间隙和阀片少,而且随电压的升高数量增多
C. 串联的火花间隙和阀片少,而且随电压的升高数量减小
【单选题】
TT系统是指电源中性点直接接地,而设备的外露可导电部分经各自的___分别直接接地的三相四线制低压供电系统
【单选题】
倒闸操作前,应先在___进行模拟操作。
A. 实际设备上
B. 模拟图板上
C. 操作票上
【单选题】
运行过程中易发生过负荷和需要防止起动或自起动时间过长的电动机应装设___。
A. 过负荷保护
B. 低电压保护
C. 失步保护
【单选题】
发生高压设备、导线接地故障时,在室外人体不得接近接地故障点___以内。
【单选题】
当变压器绝缘材料的工作温度___允许值时,其使用寿命将缩短。
【单选题】
对于较为重要、容量较大的变电所,操作电源一般采用___。
A. 直流操作电源
B. 交流操作电源
C. 逆变操作电源
【单选题】
额定容量是指:在变压器铭牌所规定的额定状态下,变压器二次侧的输出能力___。
【单选题】
电力网的电力线路按用途一般可分为___。
A. 输电线路和配电线路
B. 输电线路和用电线路
C. 高压线路和配电线路
【单选题】
检修工作时凡一经合闸就可送电到工作地点的断路器和隔离开关的操作手把上应悬挂:___。
A. 止步,高压危险
B. 禁止合闸,有人工作
C. 禁止攀登,高压危险
【单选题】
___指正常情况下有明显断开的备用电源或备用设备或备用线路。
【单选题】
工作票应由___签发。
A. 工作负责人
B. 工作票签发人
C. 工作许可人
【单选题】
在二类负荷的供电要求中,二类负荷的供电系统宜采用___回路线供电。
【单选题】
SF6断路器是用___作为绝缘介质和灭弧介质。
A. 液态img:tq/images1/tk/s_f_6.png;img
B. 气体
C. 分解的低氟化硫
【单选题】
SF6断路器的特点之一是___。
A. 开断电流大
B. 断口耐压低
C. 开断电流小
【单选题】
电气设备由事故转为检修时,应___。
A. 填写工作票
B. 直接检修
C. 汇报领导后进行检修
【单选题】
热备用状态指设备的___,只要开关合上,就能送电。
A. 刀闸已合上,开关末合
B. 开关末合
C. 刀闸已合上
【单选题】
___指正常情况下没有断开的备用电源或备用设备,而是工作在分段母线状态,靠分段断路器取得相互备用。
【单选题】
在变配电站停电检修或安装时,___负责完成安全技术措施与安全组织措施。
【单选题】
当变压器负载一定(即损耗不变),而周围环境温度不同时,变压器的实际温度就___。
【单选题】
继电保护动作的选择性,可以通过合理整定___和上下级保护的动作时限来实现。
【单选题】
有填料高压熔断器利用___原理灭弧。
A. 利用电弧与固体介质接触加速灭弧
B. 窄缝灭弧
C. 将电弧分割成多个短电弧
【单选题】
阅读___的顺序是:先交流后直流再信号,从上而下,从左到右,层次分明。
【单选题】
全电路欧姆定律表明,在闭合回路中,电流的大小与电源电动势___,与整个电路的电阻成反比。
【单选题】
手车式开关柜,小车已推入,开关合入,称之为___。
【单选题】
对于中、小容量变压器,可以装设单独的___,作为变压器防止相间短路故障的主保护。
A. 电流速断保护
B. 过电流保护
C. 差动保护
【单选题】
触头间介质击穿电压是指触头间___。
A. 电源电压
B. 电气试验时加在触头间的电压
C. 触头间产生电弧的最小电压
【单选题】
下列___属于基本安全用具。
A. 绝缘棒、绝缘夹钳
B. 绝缘手套、绝缘靴
C. 携带型接地线、临时遮栏
【单选题】
断路器的分、合闸指示器应___,并指示准确。
A. 用金属物封闭
B. 可随意调整
C. 易于观察
【单选题】
相对编号常用于___中。
A. 安装接线图
B. 屏面布置图
C. 归总式原理图
推荐试题
【单选题】
The fact that parents check the contents of the book or the film for their children to read or see shows __________. ___
A. the necessity of censorship
B. that many books and films are bad
C. that children need their parents to help them understand more
D. that the parents are permissive
【单选题】
Which of the following statements is NOT true?____________ ___
A. Some adults can’t tell right from wrong.
B. Censorship is compared to the law because both of them perform good service to society as a whole.
C. Censors pay attention only to genuine works of art.
D. Censorship is necessary because many books, plays and films are far from being “works of art”.
【单选题】
What does the word “corrupt” in Para.4 mean?__________ ___
A. Make morally bad.
B. Hurt.
C. Injure.
D. Damage.
【单选题】
What would be the best title of this passage?_____________ ___
A. Permissive Parents and Responsible Parents.
B. Censorship and the Law.
C. Censors Value Artistic Merits .
D. Censorship Performs Good Service to Society.
【单选题】
Lie detectors are widely used in the United States because _____________. ___
A. they can help detect people’s emotional stress
B. they can help detect people's physiological changes
C. they can help find out whether a person is telling the truth or not
D. they can measure the subject’s electrical resistance
【单选题】
According to the passage, we know that Britain______________. ___
A. will adopt lie detectors widely
B. will adopt lie detectors on a smaller scale
C. adopt lie detectors
D. has not decided whether to adopt lie detectors or not
【单选题】
The tests themselves are by no means free from error..." (Line 1-2.Para.3) means ____________. ___
A. the tests definitely have no error
B. the tests sometimes make mistakes
C. the polygraphers do not make mistakes
D. the polygraphers can avoid error by using some techniques
【单选题】
Which of the following is true? ________________ ___
A. The tests are conducted by qualified polygraphers.
B. Innocent people may blush or stammer when questioned.
C. Guilty people can definitely be found out by answer questions
D. Guilty people may escape by refusing to answer questions.
【单选题】
What troubles lie detector researchers most is that _______________. ___
A. innocent people are convicted crimes
B. innocent people will learn to tell lies
C. lie detectors may cause industrial unrests
D. lie detectors are sometimes not dependable
【单选题】
In the passage the author's attitude towards "mixed-ability teaching" is _______. ___
A. critical
B. questioning
C. approving
D. objective
【单选题】
By "held back" (Line 1) the author means _____. ___
A. made to remain in the same classes
B. forced to study in the lower classes
C. drawn to their studies
D. prevented from advancing
【单选题】
The author argues that a teacher's chief concern should be the development of the student's _________. ___
A. personal qualities and social skills
B. total personality
C. learning ability and communicative skills
D. intellectual ability
【单选题】
Which of the following is NOT MENTIONED in the third paragraph? __________ ___
A. Group work gives pupils the opportunity to learn to work together with others.
B. Pupils also learn to develop their reasoning abilities.
C. Group work provides pupils with the opportunity to learn to be capable organizers.
D. Pupils also learn how to participate in teaching activities.
【单选题】
The author's purpose in writing this passage is to ______. ___
A. argue for teaching bright and not-so-bright pupils in the same class
B. recommend pair work and group work for classroom activities
C. offer advice on the proper use of the library
D. emphasize the importance of appropriate formal classroom teaching
【单选题】
According to the author, the deaths among youth are mainly caused by _____. ___
A. traffic accidents
B. smoking-related diseases
C. murder
D. all of these
【单选题】
Every day there are over_____high school students who will become regular smoker. ___
A. 75
B. 23
C. 30
D. 3000
【单选题】
By "dropout" the author means______. ___
A. students who failed the examination
B. students who left school
C. students who lost their way
D. students who were driven out of school
【单选题】
The reason for declining adolescent smoking is that ________. ___
A. NCI has taken effective measures
B. smoking is prevented among high school seniors
C. there are many smokers who have died of cancer
D. not stated
【单选题】
What is implied but not stated by the author is that ________. ___
A. smoking rates among youth have declined very little
B. there are now more female than male smokers among high school seniors
C. high smoking rates are due to the increase in wealth
D. smokers at high school are from low socio-economic backgrounds
【单选题】
According to the passage, which of the following is NOT a disadvantage of part time education? _______________ ___
A. It requires some break in one's career.
B. It tends to last too long for many people to complete a degree program.
C. It affects one's career.
D. It gives the student less time to share with the family.
【单选题】
Which of the following is NOT an advantage of distance learning? _________ ___
A. The student may choose his or her own pace.
B. The student may study at any time to his or her convenience.
C. They can pursue their chosen career while studying.
D. Their tutorial assistance comes through regular airmail, telephone, etc.
【单选题】
What benefit will distance learning program bring to a business? __________ ___
A. Recruitment of more talented people.
B. Good image of the business.
C. Better cooperation with universities.
D. Further training of employees and business growth.
【单选题】
Good distance learning program have the following characteristic EXCEPT______. ___
A. distance learning course is the same as students taking courses in campus
B. the degree should be same as on campus study
C. professor-student relationship is strictly one to one all through the course
D. includes subject evaluation tool
【单选题】
What benefit will distance learning bring to an employee of a business? ___________ ___
A. Professional growth.
B. Good relationship with the employer.
C. Good impression on the employer.
D. Higher salary.
【单选题】
In the first paragraph, what does "plastic money" (Line 6, Para.1) refer to? ______ ___
A. Dollars.
B. Online payment.
C. Credit cards.
D. Coins.
【单选题】
Which of the following is NOT true about credit cards? ____________ ___
A. Shopkeepers, among others, object to the use of credit cards because they add on the cost of the merchandise.
B. Credit card holders actually pay for their goods after the purchase has been completed.
C. The national company enjoys extensive growth because of the use of credit cards.
D. It has had the effect of increasing consumption.
【单选题】
What is the disadvantage of credit cards? _____________ ___
A. It may lead to the overgrowth of the national economy.
B. The delay in the payment of shopping goods may bring damage to shopkeepers' profits.
C. Some people may intentionally purchase goods that they cannot possibly afford.
D. Those who pay by cash at the purchase will have to pay for the cost added to the product as the interest charge of credit cards.
【单选题】
What is the main topic of the text? ________________ ___
A. Advantages and Disadvantages of Credit Cards.
B. Economic Growth Backed up by the Use of Credit Cards.
C. It can encourage great sums of consumption.
D. Credit Cards Make Life
E. asier.
【单选题】
The author's attitude towards credit card is.______________. ___
A. agreeable
B. neutral
C. humorous
D. oppositional
【单选题】
不含有割地内容的不平等条约是___。
A. 《南京条约》
B. 《北京条约》
C. 《马关条约》
D. 《辛丑条约》
【单选题】
在甲午战争后，严复翻译的《天演论》所宣传的重要思想是___。
A. “师夷长技以制夷”
B. “中学为体，西学为用”
C. “天下兴亡，匹夫有责”
D. “物竞天择，适者生存”
【单选题】
火烧圆明园发生在___期间。
A. 鸦片战争
B. 第二次鸦片战争
C. 甲午战争
D. 八国联军侵华战争
【单选题】
规定允许外国在中国办工厂的条约是___。
A. 《南京条约》
B. 《北京条约》
C. 《马关条约》
D. 《辛丑条约》
【单选题】
1895 年，日本强迫清政府签订___，割去台湾全岛及所有附属岛屿和澎湖列岛。
A. 《南京条约》
B. 《北京条约》
C. 《马关条约》
D. 《辛丑条约》
【单选题】
近代以来中国反侵略战争失败的最根本原因是___。
A. 帝国主义的强大
B. 社会制度的腐败
C. 经济技术的落后
D. 中国军队军事素质低下
【单选题】
鸦片战争以清政府的失败而告终。1842 年 8 月 29 日，清政府与英国签订了中国近代史上的第一个不平等条约是___。
A. 中英《虎门条约》
B. 中英《南京条约》
C. 中美《望厦条约》
D. 中法《黄埔条约》
【单选题】
在近代中国，规定中国向列强支付赔款最多的条约是___。
A. 《南京条约》
B. 《北京条约》
C. 《马关条约》
D. 《辛丑条约》
【单选题】
到___的订立为止，庞杂的不平等条约体系已宣告中国半殖民地社会的完全形成。
A. 《天津条约》
B. 《北京条约》
C. 《辛丑条约》
D. 《马关条约》
【单选题】
德国元帅瓦德西说：“无论欧、美、日本各国，皆无此脑力与兵力，可以统治此天下生灵四分之一，故瓜分一事，实为下策。”这表明___。
A. 帝国主义已灭亡中国
B. 帝国主义之间相互勾结
C. 帝国主义瓜分中国图谋的破产
D. 帝国主义之间的矛盾
【单选题】
帝国主义列强掀起瓜分中国的狂潮是在___。
A. 中日甲午战争爆发后
B. 第一次鸦片战争爆发后
C. 八国联军战争爆发后
D. 第二次鸦片战争爆发后
