【判断题】
通过电阻上的电流增大到原来的2倍时，它所消耗的电功率也增大到原来的2倍
查看试卷，进入试卷练习
微信扫一扫，开始刷题
相关试题
【判断题】
悬垂串上的弹簧销子、螺栓及穿钉应向受电侧穿入。两边线应由内向外，中线应由左向右穿入
【判断题】
断路器安装后载流部分的可挠连接不得有折损，表面凹陷及锈蚀
【判断题】
断路器在接线安装前要先分清哪侧是进线侧，哪侧是出线侧
【判断题】
电容器组自电网断开后5min后不得重复接入，但自动重复接入情况除外
【判断题】
为了保护电容器组，自动放电装置应装在电容器断路器的负荷侧，并经常与电容器直接并联
【判断题】
电容器的接线柱应无弯曲和变形，丝扣无滑扣，连接引线的螺母和垫片应齐全
【判断题】
电杆在线路的垂直方向发生的倾斜，若使用牵引工具正杆时，采取可靠安全措施，也可在线路不停电的情况下进行
【判断题】
放线场地，应选择宽阔、平坦的地形，以便放线工作顺利开展
【判断题】
三相四线电能计量装置中，三台电流互感器的二次绕组与电能表之间宜采用六线制连接
【判断题】
《国家电网公司电费抄核收管理规则》规定，在采用远程抄表方式后的三个抄表周期内，应每月进行现场核对抄表。发现数据异常，立即处理
【判断题】
电源是将其他形式的能转换成电能的一种转换装置
【判断题】
电气图上继电器的触点位置均是指“通电状态”
【判断题】
雷电时，可以用兆欧表在停电的高压线路上测量绝缘电阻
【判断题】
电压监测点必须装设自动记录型电压监测仪，连续不间断地进行监测统计和记录，并保证停电时永久不丢失已监测到的数据
【判断题】
跌落式熔断器的熔管或熔丝配置不合适或安装不牢固时，有可能发生单相掉管
【判断题】
白炽灯照明线路接线原则是将中性线接入开关，相线接入灯头
【判断题】
配电箱安装的垂直偏差不应大于3mm，操作手柄距侧墙的距离不应小于200mm
【判断题】
使用验电笔时验电前要先到有电的带电体上检验一下验电笔是否正常
【判断题】
电压三角形、阻抗三角形、功率三角形都是相量三角形
【判断题】
对高电压大容量电气设备进行吸收比试验时，往往发生误判断，即上述类型的设备吸收比的大小，不能说明其绝缘电阻值的高低
【判断题】
在终端杆上对导线弧垂进行调整时，应在横担两端导线侧做好临时拉线，防止横担因受力不均而偏转
【判断题】
人工对水泥构件表面进行处理，应先清除裂纹处松动颗粒物，清除油污、杂质、灰尘
【判断题】
配电变压器台的设置，其位置应在负荷中心或附近便于更换和检修设备的地段
【判断题】
与电缆本体比较，电缆头的绝缘是薄弱环节
【判断题】
热缩电缆头的适应性广，可以用于室内、外，可用于各种电缆，可用于各种环境条件及狭小的空间
【判断题】
制作电缆终端头，在安装应力管前，应清洁半导电层和铜带屏蔽表面，清洁线芯绝缘表面，确保绝缘表面没有炭迹
【判断题】
电缆埋地敷设，在电缆下面应铺混凝土板或黏土砖
【判断题】
电力电缆和控制电缆在一个电缆沟内敷设时，应分别安装在沟的两边支架上
【判断题】
用户申请的最大需量低于变压器容量(1kV·A视同1kW)和高压电动机容量总和的40%时，可按低于40%的容量核定最大需量
【判断题】
《功率因数调整电费办法》规定：100kVA以上的农业用户执行功率因数标准为0.85
【判断题】
《功率因数调整电费办法》规定，160千伏安高压供电的工业客户执行0.9的功率因数标准
【判断题】
连接接地体与电气设备的接地部分的金属导线称为接地线(PE线)
【判断题】
在运动电荷的电荷量和速度大小一定的情况下，当电荷沿着与磁场方向平行的方向运动时，所受到的磁场力为最大
【判断题】
三相负载作三角形连接时，线电压等于相电压
【判断题】
允许电器设备在一定时间内安全工作的最大电压、电流或功率，分别叫做额定电压、额定电流或额定功率
推荐试题
【单选题】
Almost half of that group will experience stress ___ enough to call for professional help.
A. tense
B. moderate
C. bearable
D. intense
【单选题】
If you grow too fast your entire economy could completely shut down and bring growth to a(n) ___.
A. halt
B. cease
C. peak
D. epidemic
【单选题】
I tried my best to drive inside in order to avoid the edges that might make me ___ the steep slope.
A. slip down
B. settle down
C. bring down
D. turn down
【单选题】
When the driver heard that there was a bomb on the bus, he immediately ___ to the side of the highway and radioed the police.
A. put out
B. took off
C. pulled over
D. slipped off
【单选题】
She was very ___ to become a manager in our customers’ office, but finally accepted our offer.
A. eager
B. intelligent
C. ridiculous
D. reluctant
【单选题】
In the race, it looked as if he would be the first, but then another young man who was close behind him put on speed and ___ by a few seconds.
A. beat him for it
B. beat him to it
C. beat him up
D. beat it to him
【单选题】
It is really helpful to have someone like you that we can ___ and count on during difficult times.
A. lean on
B. get to
C. hang on
D. get by
【单选题】
Women have a greater ability to ___ names with faces than men do, and they are also better at recalling lists.
A. associate
B. compare
C. engage
D. involve
【单选题】
He was always ready to help others and managed to ___ his friends ____being hurt.
A. expose … to
B. confine …to
C. restrict … from
D. shield … from
【单选题】
Older people are less likely to be ___ their negative emotions (情绪) and more likely to focus on the positive.
A. reserved for
B. caught up in
C. beat up to
D. counted on
【单选题】
I don’t have any bandage, so I have to ___ pressure to the wound to keep the bleeding down.
A. apply
B. involve
C. fulfill
D. establish
【单选题】
It is important that whichever candidate (候选人) is picked the loser should accept the defeat ___.
A. in advance
B. with great pride
C. with good grace
D. in large part
【单选题】
___ that new homes cost more than older homes, but that is not true across the country anymore.
A. It used to be
B. It is used to be
C. It used to being
D. It is used to being
【单选题】
The boss ___ his employees to work longer hours as the company is dreadfully short of staff at present.
A. called on
B. signed up
C. cared for
D. set up
【单选题】
The president’s visit and ___ discussions led to a plan that aimed to improve the trade relations between the two countries.
A. emerging
B. subsequent
C. consequent
D. Submerging
【单选题】
The author ___ his general idea mainly through statistics and results obtained from a survey (调查) about auto customer services in the United States.
A. assumes
B. engages
C. illustrates
D. represents
【单选题】
People in this town starved, several buildings were bombed and crime ___ because you had to steal to eat.
A. eroded
B. reflected
C. released
D. soared
【单选题】
Olympic recognition for bodybuilding (健美) remains ___ since some argue that bodybuilding is not a sport because the actual contest does not involve the same sort of efforts as “real” sports.
A. controversial
B. conventional
C. characteristic
D. influential
【单选题】
Tom tried to justify his absence from the meeting by ___ that he had been ill that day.
A. admitting
B. advocating
C. claiming
D. citing
【单选题】
___ the huge financial benefits, biological companies have been rushing to set up laboratories and new research projects.
A. Aware
B. Aware of
C. Not aware
D. Not aware of
【单选题】
Unfortunately, ___ lack of funds, the studies he began just two months ago, had to be ended early.
A. out of
B. in addition to
C. owing to
D. to begin with
【单选题】
With a good command of English, he soon got ___ to working with British people.
A. accustomed
B. consistent
C. relevant
D. responsible
【单选题】
What needs to be ___ here is that language and culture interact, and that understanding of one requires understanding of the other.
A. altered
B. stressed
C. aroused
D. committed
【单选题】
Policies and organizations must be created to meet workers’ hopes, and to ___ new problems that inevitably arise between workers and managers.
A. compromise
B. ensure
C. undermine
D. resolve
【单选题】
To keep the wheels of industry turning, we produce consumer goods in endless quantities, and, in the process, are rapidly ___ our natural resources.
A. ignoring
B. collapsing
C. enduring
D. exhausting
【单选题】
As a person who loves peace, he is committed ___ realizing peace between countries.
A. of
B. about
C. for
D. to
【单选题】
Learning how to use chopsticks is easy for me, ___ learning how to conduct myself at the table is quite difficult.
A. whereas
B. however
C. therefore
D. besides
【单选题】
___ that the patient smokes 50 cigarettes a day, it would be reasonable to assume there is some lung damage.
A. To give
B. Giving
C. Given
D. Having given
【单选题】
Kenyan (肯尼亚的) women tend to vote for those who could provide them ___ the necessary food to live on.
A. of
B. with
C. for
D. about
【单选题】
___ all obstacles and failures, the scientist continued doing his experiments day and night.
A. In spite of
B. In contrast to
C. As a matter of
D. As a result of
【单选题】
I’m willing to ___ that a larger car would have cost more, but I still think we should have bought one.
A. withdraw
B. indicate
C. abandon
D. concede
【单选题】
Manufacturing (制造) companies spend millions of pounds on advertisements, trying to ___ customers that their products are better than those of other companies.
A. confine
B. convince
C. depress
D. reconcile
【单选题】
He is not the right person for the project: he is not very technically minded and ___, he does not have the sense of responsibility.
A. instead
B. yet
C. furthermore
D. nevertheless
【单选题】
Death rates declined in many places, partly because of the ___ in hunger.
A. decrease
B. myth
C. obstacle
D. burden
【单选题】
In deciding whether or not a situation is safe, pilots must be taught to assume that the worst will happen, and then to ___ whether there is a risk or not.
A. absorb
B. apply
C. assess
D. occupy
【单选题】
The worker was not worried as he knew that if he gave up the job, there would be ___ opportunities for him to work somewhere else.
A. formative
B. marginal
C. vigorous
D. numerous
【单选题】
The research shows the region might ___ overheating (经济过热), but the policymakers so far appear to be relatively relaxed about the future of the economy.
A. catch a glimpse of
B. be at risk of
C. take a toll on
D. be free from
【单选题】
Measures have been taken to ensure that no student will have to ___ of college for economic reasons.
A. lay out
B. cancel out
C. drop out
D. stand out
【单选题】
Stress that is not treated can lead to significant medical illnesses, which ___ can lead to greater stress and even depression (抑郁症).
A. after all
B. in turn
C. on the contrary
D. at least
【单选题】
Narcissism (自恋) has its benefits in terms of self-belief and confidence, but it also tends to be ___ risky decision-making.
A. associated with
B. contrasted with
C. reserved for
D. relieved of
