【单选题】
二次回路交流耐压试验电压为1000V。当回路绝缘电阻值在10MΩ以上时,可采用___V伏摇表代替,试验持续时间为1min。
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相关试题
【单选题】
高分断能力高压熔断器的特点之一是分断___的能力强。
【单选题】
电力系统中一般使用___进行无功补偿。
A. 磁力补偿起动器
B. 移相(并联)电容器
C. 脉冲电容器
【单选题】
一张倒闸操作票最多只能填写___操作任务。
【单选题】
差动保护属于按___分类。
A. 被保护的对象
B. 保护原理
C. 保护所起作用
【单选题】
变压器二次侧额定电压指的是分接开关放在额定电压位置,一次侧加___时,二次侧开路的电压值。
【单选题】
云中的水滴受强烈气流的摩擦产生电荷,而且小水滴带___。
【单选题】
变压器保护属于按___分类。
A. 被保护的对象
B. 保护原理
C. 保护所起作用
【单选题】
真空断路器要求波纹管既能保证动触头能做___,同时又不能破坏灭弧室的真空度。
【单选题】
电流对人体的伤害可以分为___两种类型。
A. 电伤、电击
B. 触电、电击
C. 电伤、电烙印
【单选题】
电力线路按架设方式可分为___。
A. 输电线路和配电线路
B. 高压线路和低压线路
C. 架空电力线路和电力电缆线路
【单选题】
下列___不属于电力系统中的事故。
A. 对用户少送电
B. 电能质量降低到不能允许的程度
C. 过负荷
【单选题】
下列___表示110KV母线电流差动保护A相电流公共回路。
【单选题】
电气设备有三种工作状态,即运行、___、检修状态。
【单选题】
通常要求真空断路器的触头材料具有的性能之一是___。
A. 耐弧性强
B. 导热性能差
C. 绝缘性能强
【单选题】
检修状态指设备的___,而且接地线等安全措施均已做好,这时设备就处在检修状态。
A. 开关已拉开
B. 操作电源已断开
C. 开关和刀闸均已拉开
【单选题】
在110kV及以上的电力系统,一般采用中性点直接接地的运行方式,以___。
A. 降低设备的绝缘水平
B. 保障人身安全
C. 保障人身设备安全
【单选题】
真空断路器是利用___作绝缘介质和灭弧介质的断路器。
【单选题】
流过导体单位截面积的电流叫电流密度,其单位为___。
A. 安培
B. 安培/平方米
C. 安培/平方毫米
【单选题】
继电保护回路编号用___位及以下的数字组成。
【单选题】
人体与带电体直接接触触电,以___对人体的危险性最大。
A. 中性点直接接地系统的单相触电
B. 两相触电
C. 中性点不直接接地系统的单相触电
【单选题】
屋顶上单支避雷针的保护范围可按保护角___确定。
【单选题】
变压器的一、二次电压一般允许有___的差值,超过则可能在两台变压器绕组中产生环流,影响出力,甚至可能烧坏变压器。
【单选题】
下列___属于辅助安全用具。
A. 绝缘手套、绝缘靴
B. 绝缘棒、绝缘夹钳
C. 携带型接地线、临时遮栏
【单选题】
在办理停电、送电手续时,严禁___停电、送电。
【单选题】
运行中的断路器日常维护工作包括对___的定期清扫。
A. 二次控制回路
B. 绝缘部分
C. 不带电部分
【单选题】
隔离开关按刀闸运动方式分类可分为___、垂直旋转式和插入式。
A. 360°旋转式
B. 捆绑式
C. 水平旋转式
【单选题】
架空线路装设自动重合闸装置后,可以___。
A. 提高耐雷水平
B. 提高供电可靠性
C. 降低杆塔接地电阻
【单选题】
当变压器容量由冷却方式而变更时,则额定容量是指___。
A. 最大的容量
B. 最小的容量
C. 中间的容量
【单选题】
手车式开关柜,小车已拉出,开关断开,于本室内接地刀闸已闭合,称之为___状态。
【单选题】
当电气装置或设备发生火灾或引燃附近可燃物时,首先要___。
【单选题】
用万用表测量电阻时,则需要将___作为测量电源。
【单选题】
为了适应断路器在不同安装地点的耐压需要,国家相关标准中规定了断路器可承受的___。
A. 最高工作电压
B. 最低工作电压
C. 最小过电压幅值
【单选题】
三相变压器绕组为D联结时,___。
A. 线电流为√3倍的绕组电流
B. 线电流为绕组电流
C. 线电流为2倍的绕组电流
【单选题】
在不损害变压器___和降低变压器使用寿命的前提下,变压器在较短时间内所能输出的最大容量为变压器的过负载能力。
【单选题】
三相变压器Dyn11绕组接线表示一次绕组接成___。
【单选题】
继电保护的___是指发生了属于它该动作的故障,它能可靠动作而在不该动作时,它能可靠不动。
【单选题】
在全部停电和部分停电的电气设备上工作,必须完成的技术措施有___。
A. 停电;验电;挂接地线;装设遮栏和悬挂标示牌
B. 停电;放电;挂接地线;装设遮栏和悬挂标示牌
C. 停电;验电;放电;装设遮栏和悬挂标示牌
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【填空题】
take a toll on，in other words ，drop out，in turn ，at risk (of) ，interfere with，be accustomed to， contribute to，cut back on ，hold on to
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【填空题】
take a toll on，in other words ，drop out，in turn ，at risk (of) ，interfere with，be accustomed to， contribute to，cut back on ，hold on to
If a person adopts an unhealthy lifestyle, he will surely be [ ]developing diseases.
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take a toll on，in other words ，drop out，in turn ，at risk (of) ，interfere with，be accustomed to， contribute to，cut back on ，hold on to
Most people were ready to give up on him when he [ ] of school, but later he returned and earned his degree
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When you move to a new country, you may find the food there strange and you may miss the familiar smells of the food [ ] in your country
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take a toll on，in other words ，drop out，in turn ，at risk (of) ，interfere with，be accustomed to， contribute to，cut back on ，hold on to
Although he kept trying and failing, I always [ ] the belief that he would succeed one day.
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The tax only affects people with an annual income over $200,000-[ ], it will only attect the very rich.
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Studies[ ]that children who often take part in cooperative programs benefit a lot more than other children
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controversial，assess， resolve，decrease，alter，abandon，indicate，undermine，compromise， conventional
They are such a(n) [ ] family- they must have been shocked when their son dyed(染) his hair pink,
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controversial，assess， resolve，decrease，alter，abandon，indicate，undermine，compromise， conventional
Testing students by examinations has long been regarded as a reliable way to [ ]students'ability
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controversial，assess， resolve，decrease，alter，abandon，indicate，undermine，compromise， conventional
Many power stations have been modernized to give off less pollution, or they were moved further away from the living areas in order to [ ] the damage,
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Unemployment has come down slightly, but this does not [ ]the fact that it is still a major problem
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controversial，assess， resolve，decrease，alter，abandon，indicate，undermine，compromise， conventional
Mr. Smith is not doing well; the doctor told us that several colds [ ]his health
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controversial，assess， resolve，decrease，alter，abandon，indicate，undermine，compromise， conventional
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open the door to，In advance，all at once，reap the benefits (of)， make the most of，over time， get by， stand a chance (of)，remind of， take pleasure in，
Experts say our company is amazing in that sales have been increasing steadily [ ]
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free of/ from ，after all，straighten up， throw away
After 10 years of full-time training, she has,finally [ ] as a professional dancer.
【填空题】
make it， with open arms ，strip off，keep back，
free of/ from ，after all，straighten up， throw away
[ ], what is the point in taking part in the competitive event if the result is only to prove how incompetent you are?,
【填空题】
make it， with open arms ，strip off，keep back，
free of/ from ，after all，straighten up， throw away
Redecorating the house is a challenging task. It's necessary to [ ] the wallpaper first.
【填空题】
make it， with open arms ，strip off，keep back，
free of/ from ，after all，straighten up， throw away
I never really had any problems with change. On the contrary, I welcome change [ ]
【填空题】
make it， with open arms ，strip off，keep back，
free of/ from ，after all，straighten up， throw away
A lot of what we [ ] is made from raw materials which are not renewable
【填空题】
make it， with open arms ，strip off，keep back，
free of/ from ，after all，straighten up， throw away
Megan and John realized that their house was too messy for a new baby, so they decided to [ ] their house before the baby was born
【填空题】
make it， with open arms ，strip off，keep back，
free of/ from ，after all，straighten up， throw away
Jennifer couldn't [ ] her tears when she saw the sick children at a new blood cancer center in Virginia
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make it， with open arms ，strip off，keep back，
free of/ from ，after all，straighten up， throw away
We want to give all children a world [ ] violence
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advocate，involve，confine，respond，subsequent ，distinct ，intense， fulfill，circumstance， reconcile
Fortunately, the accident didn't [ ] many people, for there was little traffic at that hour.
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advocate，involve，confine，respond，subsequent ，distinct ，intense， fulfill，circumstance， reconcile
She[ ] her ambition of becoming a fashion designer after years of hard work
【填空题】
advocate，involve，confine，respond，subsequent ，distinct ，intense， fulfill，circumstance， reconcile
They kept on trying their best to develop
their business, but in such [ ]market competition, they had no Idea if success would come along one day
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advocate，involve，confine，respond，subsequent ，distinct ，intense， fulfill，circumstance， reconcile
As music plays an important role in our life, many music teachers and educators [ ] taking up a musical instrument at a young age
【填空题】
advocate，involve，confine，respond，subsequent ，distinct ，intense， fulfill，circumstance， reconcile
This rule should be entirely clear in the minds of everyone and should not be misunderstood under any [ ]
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advocate，involve，confine，respond，subsequent ，distinct ，intense， fulfill，circumstance， reconcile
My daughter was shy; she was afraid to ask questions,[ ] to questions in class,or talk with other children
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advocate，involve，confine，respond，subsequent ，distinct ，intense， fulfill，circumstance， reconcile
I got from him only a letter, which was put on my office desk; [ ] to the receipt of this letter I have never heard from him
【填空题】
advocate，involve，confine，respond，subsequent ，distinct ，intense， fulfill，circumstance， reconcile
The duties to provide services for children in need are not [ ] to the local social services department
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advocate，involve，confine，respond，subsequent ，distinct ，intense， fulfill，circumstance， reconcile
We pray that all nations be [ ] and that all people around the world live in peace
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controversial，assess， resolve，decrease，alter，abandon，indicate，undermine，compromise， conventional
It was reported the president had [ ]to fight If war was necessary,even if it meant destroying his chances of re-election
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controversial，assess， resolve，decrease，alter，abandon，indicate，undermine，compromise， conventional
I had to [ ] one of my email accounts as it was filled with junk mail
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controversial，assess， resolve，decrease，alter，abandon，indicate，undermine，compromise， conventional
Darwin's theory of evolution remains[ ] partly because it challenges the religious belief that God created man
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advocate，involve，confine，respond，subsequent ，distinct ，intense， fulfill，circumstance， reconcile
He suggested a small but [ ] improvement on our former plan; I really appreciate it.
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in sb. 's words，count on，make sense of ，reserve for， shield from，call on， sum up， relate to ，in need，
be/ get caught up in
She held her hand above her eyes to [ ]them [ ] the sun so that she could see more clearly the man in front of her
【填空题】
in sb. 's words，count on，make sense of ，reserve for， shield from，call on， sum up， relate to ，in need，
be/ get caught up in
The boy studied the signs for over an hour,but still could not [ ]them, so he turned to his teacher for help
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in sb. 's words，count on，make sense of ，reserve for， shield from，call on， sum up， relate to ，in need，
be/ get caught up in
They [ ] the developed countries to commit more money to protecting the environment
