【判断题】
兆欧表有“线”(L)、“地”(E)和“屏”(G)三个接线柱，进行一般测量时，只要把被测绝缘电阻接在“L”和“E”之间即可
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相关试题
【判断题】
商业、非居民照明及动力用电实行《功率因数调整电费办法》
【判断题】
坚持“先外后内”的原则，当有客户办理业务时，应办完手中的工作，马上接待客户
【判断题】
绝缘手套进行外观检查时如发现穿孔或漏气、损坏应停止使用
【判断题】
10kV杆上避雷器接地引线就与设备外壳连接，不能迂回盘绕，应短而直
【判断题】
6kV及以上的电缆一般都有导体屏蔽层和绝缘屏蔽层
【判断题】
在对称三相电路中，负载作三角形连接时，线电流是相电流的3倍，线电流的相位滞后相应的相电流30°
【判断题】
在R—L串联电路中，总电压超前总电流的相位角就是阻抗角，也就是功率因数角
【判断题】
10kV电力变压器过负荷保护动作后，发出警报信号，不作用于跳闸
【判断题】
断路器设备线夹选择时应与导线相匹配，确保连接紧密、可靠
【判断题】
电能表的型号是用字母和数字的排列来表示的。一般由类别代号、组别代号、用途代号、设计序号组成
【判断题】
《农村供电营业规范化服务窗口标准》要求：居民办理交费业务的高峰期要适当增设收费窗口，缩短收费时间
【判断题】
悬式绝缘子多组成绝缘子串，用于10kV及以上的线路
【判断题】
在低电价线路上接高电价设备，应补交的差额电费，时间难以确定按6个月计算
【判断题】
距接地体越远，接地电流通过此处产生的电压降就越小，电位就越低
【判断题】
常用单相电能表接线盒内有四个接线端，自左向右按“1”、“2”、“3”、“4”编号。接线方法为“1”接火线进线、“2”接零线进线，“3”接火线出线，“4”接零线出线
【判断题】
三相电动机在起动时，其定子绕组接成三角形，正常运行时改接成星形，电动机的这种起动方法称为星三角起动法
【判断题】
收费的桥梁收费站、公厕设施用电按商业电价计费
【单选题】
接地装置的接地电阻一般【】年测量一次。___
A. 每季
B. 每半年
C. 1～3年
D. 3～5年
【单选题】
架空低压配电线路的导线在绝缘子上的固定，普遍采用【】法。___
A. 金具连接
B. 螺栓压紧
C. 绑线缠绕
D. 线夹连接
【单选题】
在绑扎铝导线时，应在导线与绝缘子接触处缠绕【】。___
A. 铝包带
B. 黑胶布
C. 绝缘胶布
D. 黄蜡带
【单选题】
坐收是指供电企业设立的营业站或收费站【】收费，即坐在柜台里收费。___
A. 固定值班
B. 银行代收
C. 电费储蓄
D. 托收
【单选题】
当年电费回收率的计算公式是【】。___
A. (实收电费/应收电费)×100%
B. (未收电费/应收电费)×100%
C. (未收电费/实收电费)×100%
D. 实收电费/应收电费
【单选题】
《居民用户家用电器损坏处理办法》规定，不属于责任损坏或未损坏的元件，受害居民用户也要求更换时，所发生的元件购置费与修理费由【】负担。___
A. 居民用户
B. 提出要求者
C. 受害居民
D. 供电企业
【单选题】
用电设备保护接地装置，接地电阻值一般不应大于【】Ω。___
【单选题】
人字拉线是由两根普通拉线组成，多用于【】。___
A. 终端杆
B. 转角杆
C. 分支杆
D. 中间直线杆
【单选题】
一类高层建筑中一定要选择带自起动装置的柴油发电机组，一旦市网供电中断，必须在【】内供电。___
A. 15秒
B. 2分钟
C. 10分钟
D. 20分钟
【单选题】
【】是指供电设施发生故障或检修时，能使客户的部分或全部生产过程正常用电而设置的电源。___
A. 保安电源
B. 双电源
C. 备用电源
D. 临时电源
【单选题】
电压互感器的一次绕组应与被侧电路【】。___
【单选题】
三相四线三元件有功电能表在测量平衡负载的三相四线电能时，若有两相电压断线，则电能表将【】。___
A. 停转
B. 少计2/3
C. 倒走1/3
D. 正常
【单选题】
三相异步电动机转子的转速【】同步转速。___
A. 低于
B. 高于
C. 等于
D. 可以低于，也可以高于
【单选题】
某单相用户功率为2.2kW，功率因数为0.9，则计算电流为【】。___
A. 10A
B. 9A
C. 11A
D. 8A
【单选题】
触电持续时间越长．引起心室颤动的电流会【】。___
A. 增大
B. 减小
C. 不变
D. 无法确定
【单选题】
对投诉举报案件，受理查处率要达到100％，并且投诉在5日内、举报在【】日内给予答复。___
【单选题】
装设在客户处计费电能表，因不可抗力致使计费电能表出现或发生故障的，【】应负担更换或修理的费用。___
A. 供电企业
B. 客户
C. 供电企业和客户共同承担
D. 当地政府
【单选题】
阀形避雷器的放电特性是由【】决定的。___
A. 阀片
B. 间隙
C. 间隙与阀片共同
D. 电压
【单选题】
测量绝缘电阻及直流泄漏电流通常不能发现的设备绝缘缺陷是【】。___
A. 贯穿性缺陷
B. 整体受潮
C. 贯穿性受潮或脏污
D. 整体老化及局部缺陷
【单选题】
星形连接时三相电源的公共点叫三相电源的【】。___
A. 中性点
B. 参考点
C. 零电位点
D. 接地点
【单选题】
动力配电平面图是反映动力回路电源在【】情况的图纸。___
A. 平面电源
B. 平面
C. 平面上布置
D. 平面动力
推荐试题
【单选题】
Which of the following may lead to family quarrels according to the passage?___
A. Unawareness of energy cycles.
B. Familiar monologues.
C. A change in a family member's energy cycle.
D. Attempts to control the energy cycle of other family members.
【单选题】
If one wants to work efficiently at his low point in the morning, he should __________.___
A. change his energy cycle
B. overcome his laziness
C. get up earlier than usual
D. go to bed earlier
【单选题】
You are advised to rise with a yawn and stretch because it will __________.___
A. help to keep your energy for the day's work
B. help you to control your temper early in the day
C. enable you to concentrate on your routine work
D. keep your energy cycle under control all day
【单选题】
Which of the following statements is NOT true?___
A. Getting off to work with a minimum effort helps save one's energy.
B. Dr. Kletman explains why people reach their peaks at different hours of day.
C. Habit helps a person adapt to his own energy cycle.
D. Children have energy cycles, too.
【单选题】
An effective way to prevent the burnout of young athletes is __________.___
A. to increase their sense of success
B. to make sports less competitive
C. to reduce their mental stress
D. to make sports more challenging
【单选题】
According to the passage sport is positive for young people in that __________.___
A. it can help them learn more about society
B. it enables them to find flaws in themselves
C. it teaches them how to set realistic goals for themselves
D. it can provide them with valuable experiences
【单选题】
Many coaches and parents are in the habit of criticizing young athletes __________.___
A. without realizing criticism may destroy their self-confidence
B. in order to make them remember life's lessons
C. believing that criticism is beneficial for their early development
D. so as to put more pressure on them
【单选题】
According to the passage parents and coaches should __________.___
A. help children to win every game
B. pay more attention to letting children enjoy sports
C. train children to cope with stress
D. enable children to understand the positive aspect of sports
【单选题】
The author's purpose in writing the passage is _________.___
A. to persuade young children not to worry about criticism
B. to stress the importance of positive reinforcement to children
C. to discuss the skill of combining criticism with encouragement
D. to teach young athletes how to avoid burnout
【单选题】
As pointed out at the beginning of the passage, people used to think that air pollution _______.___
A. cause widespread damage in the countryside
B. affected the entire eastern half of the United States
C. had damaged effect on health
D. existed merely in urban and industries areas
【单选题】
As to the greenhouse effect, the author ________.___
A. share the same view with the scientist
B. is uncertain of its occurrence
C. rejects it as being ungrounded
D. thinks that it will destroy the world soon
【单选题】
The underlined word "offset" in the second paragraph could be replaced by _________.___
A. slip into
B. make up for
C. set up
D. catch up with
【单选题】
It can be concluded that ____________.___
A. raising the world's temperature only a few degrees would not do much harm to life on earth
B. lowering the world's temperature merely a few degrees would lead major farming areas to disaster
C. almost no temperature variations have occurred over the past decade
D. the world's temperature will remain constant in the years to come
【单选题】
This passage is primarily about __________.___
A. the greenhouse effect
B. the burning of fossil fuels
C. the potential effect of air pollution
D. the likelihood of a new ice age
【单选题】
What is the major function of paragraph 1?___
A. To arouse the reader's concern.
B. To introduce the theme of the whole passage.
C. To summarize the whole passage.
D. To state the primary uses of TV.
【单选题】
Television, as a source of entertainment, is ________.___
A. not very convenient
B. very expensive
C. quite dangerous
D. relatively cheap
【单选题】
Why are some people against TV?___
A. Because TV programs are not interesting.
B. Because TV viewers are totally passive.
C. Because TV prices are very high.
D. Because TV has both advantages and disadvantages.
【单选题】
One of the most obvious advantages of TV is that _________.___
A. it keeps us informed
B. it is very cheap
C. it enables us to have a rest
D. it controls our lives
【单选题】
According to the passage, whether TV is good or not depends on ___________.___
A. its quality
B. people's attitude towards it
C. how we use it
D. when we use it
【单选题】
What regulation was issued by New York State concerning beverage containers?___
A. A fee should be charged on used containers for recycling.
B. Throwaways should be collected by the state for recycling.
C. Consumers had to pay for beverage containers and could get their money back on returning them.
D. Beverage companies should be responsible for collecting and reusing discarded plastic soda bottles.
【单选题】
The returned plastic bottles in New York used to _____________.___
A. be turned into raw materials
B. be separated from other rubbish
C. have a second-life value
D. end up somewhere underground
【单选题】
The key problem in dealing with returned plastic beverage containers is ______________.___
A. how to reduce their recycling costs
B. to sell them at a profitable price
C. how to turn them into useful things
D. to lower the prices for used materials
【单选题】
Recycling has become the first choice for the disposal of rubbish because ______________.___
A. recycling causes little pollution
B. other methods are more expensive
C. recycling has great appeal for the jobless
D. local governments find it easy to manage
【单选题】
It can be concluded from the passage that ____________.___
A. recycling is to be recommended both economically and environmentally
B. local governments in the U.S. can expect big profits from recycling
C. rubbish is a potential remedy for the shortage of raw materials
D. landfills will still be widely used for waste disposal
【单选题】
The author chose to study engineering at a small liberal-arts university because he ________.___
A. intended to be a sensible student with noble ideals
B. wanted to be an example of practicality and rationality
C. intended to be a combination of engineer and humanist
D. wanted to coordinate engineering with liberal-arts courses in college
【单选题】
According to the author, by interacting with people who study liberal arts, engineering students can __________.___
A. broaden their horizons
B. receive guidance in their careers
C. become noble idealists
D. balance engineering and the liberal arts
【单选题】
In the eyes of the author, a successful engineering student is expected ______________.___
A. to be imaginative with a value system to guide him
B. to be a technical genius with a wide vision
C. to have an excellent academic record
D. to be wise and mature
【单选题】
The author's experience shows that he was ________.___
A. creative
B. ambitious
C. irrational
D. unrealistic
【单选题】
The underlined word "they" in "... together they threaten to confuse." (Para.5) refers to ____________.___
A. practicality and rationality
B. engineering and the liberal arts
C. reality and noble ideals
D. flexibility and a value system
【单选题】
It can be learned from the passage that the Ouchidas' house __________.___
A. failed to meet energy conservation standards
B. was designed and constructed in a scientific way
C. is well worth the money spent on its construction
D. is almost faultless from the point of energy conservation
【单选题】
What made the Ouchidas' new house a horrible dream?___
A. Lack of fresh air.
B. Gas leakage in the kitchen.
C. The newly painted walls.
D. Poor quality of building materials.
【单选题】
The underlined word "accentuate" (Para. 3) most probably means "________".___
A. worsen
B. accelerate
C. relieve
D. improve
【单选题】
Why were cracks in old houses not a big concern?___
A. Because environmental protection was given top priority.
B. Because indoor cleanness was not emphasized.
C. Because they were technically unavoidable.
D. Because energy used to be inexpensive.
【单选题】
This passage is most probably taken from an article entitled "_________".___
A. Energy Conservation
B. Air Pollution Indoors
C. House Building Crisis
D. Traps in Building Construction
【单选题】
We need to plan ahead in order to ___________.___
A. keep a record of all the events
B. better organize our activities
C. store everything in our head
D. pile up little tasks neatly
【单选题】
Strategic times are best for us to ___________.___
A. save energy
B. check e-mails
C. study efficiently
D. organize activities
【单选题】
Which of the following could be used as a motivation to do our assignments?___
A. Remembering our urgent tasks.
B. Any activities we're eager to do.
C. Taking a break in the afternoon.
D. The promise to study efficiently.
【单选题】
What can help us to keep refreshed throughout the day?___
A. Doing some physical exercise.
B. Taking a short nap in the afternoon.
C. Rushing through some assignments.
D. Playing a game of chess with a friend.
【单选题】
Which of the following could be the best title for this article?___
A. Study Habits and Time Management
B. Business Management and Leadership
C. University Education and Campus Life
D. Life Goals and Academic Development
【单选题】
It is implied in the text that it is hard to ________.___
A. carry life learning though
B. tell the nature of life learning
C. learn without going to school
D. find a specially trained teacher
