相关试题
【判断题】
以电气回路为基础,将继电器和各元件的线圈、触点按保护动作顺序,自左而右、自上而下绘制的接线图,称为安装图。
【判断题】
避雷针及其接地装置不能装设在人、畜经常通行的地方。
【判断题】
在电阻串联的电路中,电路的端电压U等于各串联电阻两端电压的总和。
【判断题】
电流互感器分为测量用电流互感器和保护用电流互感器。
【判断题】
某一段时间内负载消耗的电能可以用电度表来测量。
【判断题】
接地线要有统一的编号,有固定的存放位置。存放位置亦应编号,接地线号码与存放位置号码应一致。
【判断题】
所谓额定容量指: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(kVA)。对于三相变压器,额定容量是三相容量之和。
【判断题】
通过与磁场方向平行的某一面积上的磁力线总线,称为通过该面积的磁通。
【判断题】
位于线路首端的第一基杆塔属于首端杆,最末端一基杆塔属于终端杆。
【判断题】
从发电厂发电机开始一直到变电设备为止,这一整体称为电力系统。
【判断题】
在一经合闸即可送电到工作地点的断路器(开关)和隔离开关(刀闸)的操作把手上,应悬挂“禁止合闸,有人工作!”的标示牌。
【判断题】
在降压变电所内,为了限制中压和低压配电装置中的短路电流,可采用变压器低压侧分列运行方式。
【判断题】
杆塔拉线与地面的夹角一般为45°,受环境限制可适当增减,一般不超出30°。
【判断题】
在二次接线回路上工作,无需将高压设备停电时应使用第一种工作票。
【判断题】
部分停电的工作,安全距离小于规定距离以内的未停电设备,应装设临时遮栏。
【判断题】
只有在同一停电系统的所有工作结束,工作票全部终结收回,拆除所有接地线、临时遮栏和标示牌,恢复常设遮栏并得到运行值班调度人员许可命令,方可合闸送电。
【判断题】
三相电度表应按正相序接线,经电流互感器接线者极性错误也不影响测量结果。
【判断题】
当系统短路或接地时,通过很大的短路电流,变压器会产生很大的噪音。
【判断题】
油箱是油浸式变压器的外壳,变压器的器身置于油箱内,箱内灌满变压器油。
【判断题】
如果人体直接碰到电气设备一相带电导体,这时电流将通过人体流入大地,这种触电称为单相触电。
【判断题】
所有工作人员(包括工作负责人)不许单独留在高压室内已免发生以外触电或电弧灼伤事故。
【判断题】
电气设备冷备用状态指设备的开关在打开位置,刀闸在合闸位置,要合上开关后才能投入运行。
【判断题】
衡量继电保护的好坏,最重要的是看其是否具有速动性。
【判断题】
剩余电流保护器只是在基本防护失效后而发挥补充防护的作用。
【判断题】
为防止跨步电压触电,进入故障点区域人员应穿绝缘鞋。
【判断题】
对于充油电流互感器应检查油位是否正常,有无渗漏现象,是电流互感器巡视检查项目之一。
【判断题】
过电压对电气设备和电力系统安全运行危害极大。
【判断题】
以电气回路为基础,将继电器和各元件的线圈、触点按保护动作顺序,自左而右、自上而下绘制的接线图,称为展开图。
【判断题】
安装接线图是以屏面布置图为基础,以原理图为依据而绘制成的接线图,是一种指导屏柜上配线工作的图纸。
【判断题】
低电压保护属于110kV及以下并联电容器组保护测控装置在保护方面的主要功能。
【判断题】
利用江河所蕴藏的水力资源来发电,这种电厂称水力发电厂。
【判断题】
变电所中,信号设备所使用的电源为操作电源。
【判断题】
中间继电器用于增加触点数量和触点容量,具有动合接点和动断接点。
【判断题】
绝缘靴(鞋)要放在柜子内,并应与其他工具分开放置。
【判断题】
对某支路的电气设备合闸时,其倒闸顺序是先合隔离开关,其次是负荷开关,最后是断路器。
【判断题】
钢绞线常用作架空地线、接地引下线及杆塔的拉线。
【判断题】
对三类负荷供电要求,一般不考虑特殊要求。
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I am not sure whether we can give the right advice _____emergency.___
A. on account of
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In their letter to the students’ representative assembly, the freshmen insisted on __________ in the Student Union.___
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Nobody noticed the thief slip into the house because the lights happened to _____.___
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----- John， may I ask you a favour？ ----- _________
A. I’m sorry， but why？
B. Sure，what is it？
C. Yes，you could.
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The two thieves fled the town separately， _______ a bag.___
A. each carrying
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Her heart _____ faster when she entered the exam hall.___
A. jumped
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The taxi driver was put in_____prison because his car had knocked down a child.His wife went to_____ prison to see him twice a month.___
A. /； /
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----- Where’s John， do you know？ ----- Oh， _____to hospital.___
A. he’s taken
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It was the wealth of the_____pioneer landowner John Harvard that made Harvard University possible.___
A. precious
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C. anxious
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----- "Where is your college located, John?" ----- "It is ________."___
A. on the Fifth Avenue
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__________ is she in London than she rings up her old friend Mary.___
A. Scarcely
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A fireman discovered the __________ of the fire.___
A. truth
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he weather __________ us from climbing the mountain.___
A. discharged
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I didn't expect to receive a postcard from you！It's really _____my wildest imagination.___
A. behind
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C. except
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John Smith is _____ honest young man.___
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She __________ in wearing that old – fashioned hat.___
A. insists
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Some of the meat came from Canada. How about________？___
A. another
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I have brought you ___ flowers for your birthday. ___
A. few
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I have also experienced many adventures, but nothing that I have seen ___what you have described. ___
A. compares
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That young man has made so much noise that he ___ not have been allowed attend the concert. ___
A. could
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“What is Mary doing at home?” “She is playing ____.”___
A. a piano
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【单选题】
I’m busy now ,ask him to see me ____ time.___
A. the other
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The child took a spoonful and tasted it carefully __________ it was hot.___
A. in case
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The French pianist who had been praised very highly __________ to be a great disappointment. ___
A. turned off
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【单选题】
“Shall I turn on the television?” – “No, I’d rather not __________ television tonight.”___
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【单选题】
They said that they had made up their minds to ____the task in spite of the extremely difficult conditions.___
A. carry on
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The two girls are getting on very well and share with each other. ___
A. little
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【单选题】
The teacher said that the classroom was empty __________ a few chairs.___
A. but for
B. except for
C. apart from
D. besides
【单选题】
______you choose， make sure that it is a good one. ___
A. What
B. Wherever
C. Whichever
D. Which
【单选题】
Vingo was released from prison_____the successful efforts of his friends to prove his innocence. ___
A. according to
B. as a result of
C. for reasons of
D. with the help of
【单选题】
Entering the room， I found my father __ at the desk and ___ something .___
A. seat... write
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C. seated ... writing
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【单选题】
Cake __________ of flour, sugar, egg and some other ingredients. ___
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Mr. Peter wanted Steve to take half the money, but Steve did not __________ it. ___
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I'd like to take my picture ________stands a high tower. ___
A. where
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__________ the English examination I would have gone to the concert last Saturday. ___
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Cars moved very slowly in the 1920s, but they ______move more quickly than in 1910.___
A. were to can
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The little girl needs __________ after her shock. ___
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The __________ horse ran away from the fire.___
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He is __________ of an actor. ___
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You can take ______ seat you like. ___
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