刷题
导入试题
【单选题】
我厂电除尘的振打方式是()。___
A. :侧面振打
B. :机械振打
C. :顶部振打
D. :电磁振打
查看试卷,进入试卷练习
微信扫一扫,开始刷题
答案
C
解析
暂无解析
相关试题
【单选题】
我厂每台机组有()台高压控制柜。___
A. :20台
B. :30台
C. :15台
D. :40台
【单选题】
电除尘方式“2:2”指的是()。___
A. :火花临界检测方式
B. :单半波间歇供电
C. :双半波间歇供电
D. :全波间歇供电
【单选题】
电除尘PLC的操作面板为()。___
A. :TD-200
B. :S2-200
C. :S7-200
D. :S7-100
【单选题】
一根长为L的均匀导线,电阻为8Ω,若将其对折后并联使用,其电阻为( )。___
A. :4Ω
B. :2Ω
C. :8Ω
D. :1Ω
【单选题】
兆欧表俗称( )。___
A. :摇表
B. :欧姆表
C. :绝缘电阻表
D. :万用表
【单选题】
使用钳形电流表,可选择 () 然后再根据读数逐次切换。___
A. :最高档位
B. :最低档位
C. :刻度一半
D. :任何档位
【单选题】
一般小型电动机启动电流是额定电流的( )倍。___
A. :0.2~1
B. :1~2
C. :4~7
D. :20~30
【单选题】
当电流超过某一预定数值时,反应电流升高而动作的保护装置叫做 ( ) 。___
A. :过电压保护
B. :过电流保护
C. :电流差动保护
D. :欠电压保护
【单选题】
负载功率为800W,功率因数为0.6,电压为200V,用一只5A/10A,250V/500V的功率表去测量,应选 ( ) 量程的表。 ___
A. :5A,500V
B. :5A,250V
C. :10A,250V
D. :10A,500V
【单选题】
正弦交流电的平均值为有效值的( )倍。___
A. :0.707
B. :0.637
C. :0.9
D. :1
【单选题】
我厂380V负荷段电源进线保护装置sel-551采用了( )保护配置。___
A. :负序瞬时过流
B. :相反时限
C. :相瞬时过流
D. :定时限过电流
【单选题】
自动空气开关低压脱扣器,当电压低到额定电压 ( ) 以下时,立即自动脱扣,使开关断开。___
A. :0.4
B. :0.5
C. :0.6
D. :0.7
【单选题】
变频器的工作原理是( )。___
A. :交流变直流
B. :交流变直流,直流再变交流
C. :直流变交流,交流再变流
D. :直流变交流
【单选题】
电力系统正常运行中,发电机励磁电流的变化主要影响电网的电压水平和并联机组间的()分配。___
A. :有功功率
B. :无功功率
C. :潮流
D. :
【单选题】
整个励磁自动控制系统是由()、励磁功率单元、发电机组成的闭环反馈系统。___
A. :励磁变
B. :励磁调节器
C. :起励单元
D. :
【单选题】
以下哪项不属于同步发电机励磁系统的主要作用。___
A. :进行发电机端电压控制
B. :控制无功功率的分配
C. :提高同步发电机并联运行的稳定性
D. :优化电力系统运行方式,进行稳定控制
【单选题】
励磁顶值电压按照要求一般定于()倍额定励磁电压。___
A. :1.2~1.5
B. :1.5~1.8
C. :1.6~2.0
D. :2.0~3.0
【单选题】
励磁系统中励磁()电压和电压上升速度是两项主要的技术指标。___
A. :额定
B. :顶值
C. :空载额定
D. :阶跃
【单选题】
励磁电压上升速度是衡量励磁功率单元()行为的一项指标。___
A. :控制
B. :调节
C. :动态响应
D. :静态响应
【单选题】
大型发电机自并励系统一般采用()整流电路。___
A. :三相半控半波
B. :三相全控半波
C. :三相全控全波
D. :三相半控全波
【单选题】
UNITROL 5000系列励磁系统的功率单元采用()作为功率元件。___
A. :整流二极管
B. :三极管
C. :可控硅
D. :IGBT
【单选题】
励磁移相触发单元的任务是产生()的触发脉冲,用来改变整流桥中晶闸管元件的控制角。___
A. :幅度不等
B. :相位可调
C. :周期可调
D. :相位一致
【单选题】
PSS(电力系统稳定调节器)的主要作用是()。___
A. :优化机组间无功分配
B. :抑制电力系统低频振荡
C. :在电力系统发生静态失稳时切除机组
D. :提高机组与系统间的阻尼
【单选题】
UN5000励磁系统的励磁电流()进行测定。___
A. :通过直流侧CT测量
B. :通过交流侧CT测量
C. :通过PSI板直接从母排测量
D. :
【单选题】
UN5000励磁系统的过电压保护单元主要元件是()。___
A. :静态开关
B. :功率二极管
C. :SIC过电压保护器
D. :BOD(雪崩二极管)
【单选题】
UN5000励磁系统的主控板是()。___
A. :MUB
B. :FCR
C. :COB
D. :EGC
【单选题】
UN5000励磁系统内部通讯是通过()来实现的。___
A. :现场总线
B. :光纤通讯
C. :ARCNET
D. :FILEDBUS
【单选题】
以下励磁系统的辅助控制功能不需与发变组保护配合的是()。___
A. :V/Hz保护
B. :低励保护
C. :过励保护
D. :转子接地保护
【单选题】
ABB转子一点接地保护UNS3020的基本原理是()。___
A. :叠加直流电压
B. :叠加交流电源
C. :电阻平衡电桥原理
D. :电容平衡原理
【单选题】
ABB转子一点接地保护UNS302的正负电压基准点取自于()。___
A. :励磁就地接地母排
B. :发电机励端接地碳刷
C. :发电机汽端碳刷接地点
D. :
【单选题】
UN5000的转子温度测定是根据()来做出曲线测定的。___
A. :转子在15摄氏度的电阻值
B. :转子在30摄氏度的电阻值
C. :转子在15摄氏度的电容值
D. :转子在30摄氏度的电容值
【单选题】
UN5000采用的整流柜冷却方式为()。___
A. :强制循环风冷
B. :自然风冷
C. :强制循环水冷
D. :强制循环氢冷
【单选题】
UN5000选用的直流监测元件——霍尔感应器的最大测量范围为()。___
A. :1000A
B. :1500A
C. :2000A
D. :2500A
【单选题】
我厂转子过电压保护采用半导体雪崩二极管进行触发,它的导通值一般为()。___
A. :1500V
B. :2000V
C. :2600V
D. :3200V
【单选题】
工作负责人对工作票所列工作任务确认不能按批准期限完成,第一种工作票应在工作批准期限前( ),由工作负责人向值班负责人申请办理延期手续。___
A. :1小时
B. :2小时
C. :3小时
D. :4小时
【单选题】
在高压场所照明回路上工作不需运行设备停电者,应使用( )种工作票。___
A. :第一种工作票
B. :第二种工作票
C. :第三种工作票
D. :口头或电话命令
【单选题】
结合实际对工作班人员进行工作前技术及安全措施交底,是( )的安全责任。___
A. :工作票签发人
B. :工作负责人
C. :工作许可人
D. :值班负责人
【单选题】
一张工作票最长工作时间不超过( )天。___
A. :7天
B. :10天
C. :15天
D. :30天
【单选题】
在已投入运行的高压场地进行扩建安装工作,电气设备未与运行设备连接,但安全距离不够的,在进行安装或试验时,必须( ) 。___
A. :办理第二种工作票
B. :办理第一种工作票
C. :办理第三种工作票
D. :加强监护
【单选题】
在已投入运行的高压场地进行扩建安装工作,电气设备未与运行设备连接,且安全距离足够的,在进行安装或试验时,必须( ) 。___
A. :办理第二种工作票
B. :办理第一种工作票
C. :办理第三种工作票
D. :采用口头命令
推荐试题
【单选题】
The in the early 1970s worsened an already stagnant economy in Britain.
A. A. oil crisis
B. B. high inflation rates
C. C. large imports
D. D. unemployment problem
【单选题】
Of the following practices, does not belong to Thatcher’s social welfare reform.
A. A. reducing child benefits
B. B. shortening the unemployment benefits period
C. C. reducing the unemployment
D. D. lowering old age pensions
【单选题】
The Blair government has been successful in all the following aspects except .
A. A. limiting government spending
B. B. keeping inflation under control
C. C. reducing unemployment
D. D. reducing inequality
【单选题】
Britain has devoted of its land area to agriculture.
A. A. 54%
B. B. 64%
C. C. 74%
D. D.84%
【单选题】
Britain’s important fishing areas include all the following except .
A. A. the North Sea
B. B. the English Channelnnel
C. C. The sea area around Ireland
D. D. The sea area between Britain and Ireland
【单选题】
Coal mining industry in Britain provides of the energy consumed in the country.
A. A. 1/3
B. B. 1/4
C. C. 1/5
D. D. 2/3
【单选题】
The car industry in Britain in mostly .
A. A. foreign-owned
B. B. state-owned
C. C. joint-venture
D. D. privately-owned
【单选题】
Of the following sectors in Britain, has experienced spectacular growth since the end of Word War II.
A. A. agriculture
B. B. energy industry
C. C. service industry
D. D. manufacturing industry
【单选题】
Samuel Johnson’s dictionary was influential in establishing a standard form of .
A. A. grammar
B. B. handwriting
C. C. spelling
D. D. pronunciation
【单选题】
At present, nearly of the world’s population communicate in English.
A. A. half
B. B. a quarter
C. C. one third
D. D. one fifth
【单选题】
The attack on Rome ended the Roman occupation in Britain in 410.
A. A. Norman
B. B. Danish
C. C. Celtic
D. D. Germanic
【单选题】
By the late 7th century, became the dominant religion in England.
A. A. Celtic Christianity
B. B. Anglo-Saxon Christianity
C. C. Germanic Christianity
D. D. Roman Christianity
【单选题】
Westminster Abbey was built at the time of .
A. A. St. Augustine
B. B. Edward the Confessor
C. C. William the Conqueror
D. D. Alfred the Great
【单选题】
The marked the establishment of feudalism in England.
A. A. Viking invasion
B. B. signing of the Magna Carta
C. C. Norman Conquest
D. D. Adoption of common law
【单选题】
The end of the Wars of the Roses led to the rule of .
A. A. the House of Valois
B. B. the House of York
C. C. the House of Tudor
D. D. the House of Lancaster
【单选题】
The direct cause for the Religious Reformation was King Henry VIII’s effort to .
A. A. divorce his wife
B. B. break with Rome
C. C. support the Protestants
D. D. declare his supreme power over the church
【单选题】
The English Civil War broke out in 1642 between .
A. A. Protestants and Puritans
B. B. Royalists and Parliamentarians
C. C. nobles and peasants
D. D. aristocrats and Christians
【单选题】
was passed after the Glorious Revolution.
A. A. Bill of Rights
B. B. Act of Supremacy
C. C. Provisions of Oxford
D. D. Magna Carta
【单选题】
The Industrial Revolution was aThe Industrial Revolution was accomplished in Britain by the middle of the century.
A. A. 17th
B. B. 18th
C. C. 19th
D. D. 20th
【单选题】
Britain faced strong challenges in its global imperial dominance by the beginning of the century.
A. A. 17th
B. B. 18th
C. C. 19th
D. D. 20th
【单选题】
As a revising chamber, the House of Lords is expected to the House of Commons.
A. A. rival
B. B. complement
C. C. criticize
D. D. inspect
【单选题】
The British government is characterized by a division of powers between three of the following branches with the exception of the .
A. A. judiciary
B. B. legislature
C. C. monarchy
D. D. executive
【单选题】
The importance of the British monarchy can be seen in its effect on .
A. A. passing the bills
B. B. advising the government
C. C. political parties
D. D. public attitude
【单选题】
British Cabinet works on the principle of .
A. A. collective responsibility
B. B. individual responsibility
C. C. defending the collectivism
D. D. defending the individuals
【单选题】
The main duty of the British Privy Council is to .
A. A. make decisions
B. B. give advice
C. C. pass bills
D. D. supervise the Cabinet
【单选题】
is the first African-American winner of the Nobel Prize for Literature.
A. A.Ralph Ellison
B. B. Tony Morrison
C. C. Richard Wright
D. D. James Baldwin
【单选题】
Of the following writers, is Not a Nobel Prize winner.
A. A. Alice Walker
B. B. Ernest Hemingway
C. C. William Faulkner
D. D. Eugene O’Neil
【单选题】
Of the following books, is NOT written by Ernest Hemingway.
A. A. The Sun Also Rises
B. B. The Sound and the Fury
C. C. A Farewell to Arms
D. D. For Whom the Bell Tolls
【单选题】
F. Scott Fitzgerald’s finest novel is , and its theme is about
A. A. The Great Gatsby, the American Dream
B. B. Tender is the Night, love
C. C. Tales of the Jazz Age, the loss of oneself
D. D. The Beautiful and the Damned, the evil of human nature
【单选题】
Of the following writers, is NOT included in the group of naturalists.
A. A. Stephen Crane
B. B. Frank Norris
C. C. Theodore Dreiser
D. D. Herman Melville
【单选题】
Of the following, is NOT characteristic of Mark Twain’s works.
A. A. colloquial speech
B. B. a sense of humor
C. C. a realistic view
D. D. an idealistic view
【单选题】
Of the following, is considered Herman Melville’s masterpiece.
A. A. The Last of the Mohicans
B. B. The Legend of Sleepy Hollow
C. C. Moby Dick
D. D. Daisy Miller
【单选题】
Of the following, is NOT Nathaniel Hawthorne’s work.
A. A. The Scarlet Letter
B. B. The House of the Seven Gables
C. C. The Marble Faun
D. D. Nature
【单选题】
is regarded as “the father of American literature”.
A. A. James Fennimore Cooper
B. B. Ralph Waldo
C. C. Thomas Jefferson
D. D. Washington Irving
【单选题】
Of the following writers, are from the Colonial and Revolutionary Periods.
A. A. Benjamin Franklin & Edgar Ellen Poe
B. B. Edgar Ellen Poe & Jonathan Edwards
C. C. Benjamin Franklin & Jonathan Edwards
D. D. Edgar Ellen Poe & Washington Irving
【单选题】
The National Day of the United States falls on .
A. A. June 4th
B. B. July 4th
C. C. June 14th
D. D. July 14th
【单选题】
Of the following, is NOT among the three major radio and TV networks in America.
A. A. the National Broadcasting System (NBS)
B. B. the Public Broadcasting Service (PBS)
C. C. the Columbia Broadcasting System (CBS)
D. D. the American Broadcasting System (ABS)
【单选题】
is sold especially to the upper or upper-middle class and it has a reputation for its serious attitude and great bulk.
A. A. The Washington Post
B. B. The New York Times
C. C. Los Angeles Times
D. D. New York Daily News
【单选题】
Of the following universities, has NOT cultivated any American President yet.
A. A. Harvard University
B. B. Massachusetts Institute of Technology
C. C. Princeton University
D. D. Yale University
【单选题】
To get a bachelor’s degree, all undergraduate students are required to do the following except .
A. A. attending lectures and completing assignments
B. B. passing examinations
C. C. working for communities
D. D. earning a certain number of credits
欢迎使用我爱刷题
×
微信搜索我爱刷题小程序
温馨提示
×
请在电脑上登陆“www.woaishuati.com”使用