秋西交《专业英语》在线作业答案.docx
- 文档编号:24037225
- 上传时间:2023-05-23
- 格式:DOCX
- 页数:15
- 大小:17.14KB
秋西交《专业英语》在线作业答案.docx
《秋西交《专业英语》在线作业答案.docx》由会员分享,可在线阅读,更多相关《秋西交《专业英语》在线作业答案.docx(15页珍藏版)》请在冰豆网上搜索。
秋西交《专业英语》在线作业答案
西交《专业英语》在线作业
试卷总分:
100得分:
100
一、单选题(共30道试题,共60分)
1.Resistorsare()elements.
A.passive
B.active
C.independentsources
D.dependentsources
[仔细分析以上试题,并作出正确选择]
正确答案是:
A
2.Anelectricheaterdraws10Afroma120Vline.Theresistanceoftheheateris().
A.1200?
B.120?
C.12?
D.1.2?
[仔细分析以上试题,并作出正确选择]
正确答案是:
C
3.Thealgebraicsumofallvoltagesaroundaloopis().
A.zero
B.indefinitevalue
C.sumofvoltagerises
D.sumofvoltagedrops
[仔细分析以上试题,并作出正确选择]
正确答案是:
A
4.ON-OFFinformationcanberepresentedby()signal.
A.adigital
B.ananalog
C.adiscrete
D.acontrol
[仔细分析以上试题,并作出正确选择]
正确答案是:
A
5.Theprocessquantizingthecontinuousvaluesintoabinaryscaleiscalled().
A.digital-to-analogconversion
B.digital-to-digitalconversion
C.analog-to-digitalconversion
D.analog-to-analogconversion
[仔细分析以上试题,并作出正确选择]
正确答案是:
C
6.Thewideapplicationofoperationalamplifiersliesinadvantageofusing().
A.positivefeedbacknetworks
B.largeopen-circuitgain
C.negativefeedbacknetworks
D.smalloutputimpedance
[仔细分析以上试题,并作出正确选择]
正确答案是:
C
7.Whenaninductionmotorwith10polesissuppliedby50Hzthree-phaseacpowersource,thesynchronousrevolutionsperminuteis().(Synchronousr/min=120f/p)
A.1000
B.900
C.700
D.600
[仔细分析以上试题,并作出正确选择]
正确答案是:
D
8.Theelectricmachinethatoperatesatspeedsabovesynchronousspeedworksin()region.
A.motoring
B.generating
C.plugging
D.stopping
[仔细分析以上试题,并作出正确选择]
正确答案是:
B
9.Atransformerisadevicethatcanconvertoneacvoltagetoanotheracvoltagethroughtheactionof().
A.anelectriccircuit
B.amagneticfield
C.anelectricfield
D.acouplingcircuit
[仔细分析以上试题,并作出正确选择]
正确答案是:
B
10.Theprimarywindingisconnectedto().
A.thepowersource
B.theload
C.themeasurementinstrument
D.themotor
[仔细分析以上试题,并作出正确选择]
正确答案是:
A
11.Copperlossesare()lossesintheprimaryandsecondarywindingsofthetransformercore.
A.inductive
B.capacitive
C.resistive
D.reactive
[仔细分析以上试题,并作出正确选择]
正确答案是:
C
12.()canprovideanasynchronouslinkbetweentwoacelectricpowersystemwithdifferentnominalfrequencies.
A.TheHVDC(highvoltageDC)transmission
B.TheEHV(extra-highvoltage)ACtransmission
C.TheACdistribution
D.Generators
[仔细分析以上试题,并作出正确选择]
正确答案是:
A
13.Thegeneratorvoltagesareusuallysteppeduptothetransmissionvoltagelevelby().
A.seriescapacitor
B.parallelreactors
C.step-uptransformers
D.step-downtransformers
[仔细分析以上试题,并作出正确选择]
正确答案是:
C
14.Theobjectiveoftheoptimaleconomicoperationofpowersystemsis().
A.tominimizethetotalproductioncost
B.tomaintainfrequencyconstant
C.tomaintainvoltagesconstant
D.toensurebalancebetweengenerationandload
[仔细分析以上试题,并作出正确选择]
正确答案是:
A
15.Anyprotectionschemeconsistsbasicallyof().
A.twoelements
B.threeelements
C.fourelements
D.fiveelements
[仔细分析以上试题,并作出正确选择]
正确答案是:
A
16.Theprotectiveschemethatsenseszerosequencecurrentandoperatesasnecessaryiscalledas().
A.overcurrentprotection
B.zerosequenceprotection
C.negativesequenceprotection
D.directionalprotection
[仔细分析以上试题,并作出正确选择]
正确答案是:
B
17.Thedistanceprotectionisappliedtoprotect().
A.transformers
B.generators
C.transmissionlines
D.buses
[仔细分析以上试题,并作出正确选择]
正确答案是:
C
18.Thethermalenergyofthesteamisconvertedinto()energybytheturbine.
A.electrical
B.mechanical
C.chemical
D.potential
[仔细分析以上试题,并作出正确选择]
正确答案是:
B
19.()isusedascoolantinlight-waterreactors.
A.Gas
B.Organiccompound
C.Moltensalt
D.Water
[仔细分析以上试题,并作出正确选择]
正确答案是:
D
20.Intheformof()theoutputiscontinuouslyfedbackandcomparedwiththereferenceinput.
A.continuouscontrol
B.discontinuouscontrol
C.discrete-datacontrol
D.sampled-datacontrol
[仔细分析以上试题,并作出正确选择]
正确答案是:
A
21.Theoveralltransferfunctionistheratioofthetransformofthecontrolledvariabletothetransformof().
A.thecontrolledvariable
B.thereferenceinput
C.thefeedback
D.theoutputvariable
[仔细分析以上试题,并作出正确选择]
正确答案是:
B
22.Thesystem’scharacteristicequationcanbeusedtodetermine()ofalineartime-invariantsystem.
A.thestability
B.magnitudeofthesteady-stateerror
C.thecontrollability
D.theobservability
[仔细分析以上试题,并作出正确选择]
正确答案是:
A
23.Intheroot-locusmethodtheactualtimeresponseofasystemcanbeobtainedbymeansof().
A.theinverseFouriertransform
B.theinverseLaplacetransform
C.theFouriertransform
D.theLaplacetransform
[仔细分析以上试题,并作出正确选择]
正确答案是:
B
24.TheBuck(降压式变换器)isa()converter.
A.voltagestep-up
B.currentstep-down
C.currentstep-up
D.resistance
[仔细分析以上试题,并作出正确选择]
正确答案是:
C
25.Mostdesktopcomputersuseaseparate()asadisplaydevice,wherenotebookcomputersuseaflatpanelLCDscreen(liquidcrystaldisplayscreen)thatattachedtothesystemunit.
A.keyboard
B.Mouse
C.Monitor
D.harddisk
[仔细分析以上试题,并作出正确选择]
正确答案是:
C
26.Adesktopcomputer’ssoundcardsendssignalstoexternal().
A.printer
B.speaker
C.Modem
D.keyboard
[仔细分析以上试题,并作出正确选择]
正确答案是:
B
27.DatastoredinRAM()whenthepowerofthecomputeristurnedoff.
A.isheldpermanently
B.permanentlydisappears
C.isheldtemporarily
D.temporarilydisappears
[仔细分析以上试题,并作出正确选择]
正确答案是:
B
28.Thenotebookcomputersuse()asstandarddisplayequipment.
A.CRTdisplay
B.LCDs
C.LED
D.TVscreen
[仔细分析以上试题,并作出正确选择]
正确答案是:
B
29.Imageclarityonacomputerscreenismeasuredwith().
A.screensize
B.dotpitch
C.resolution
D.colordepth
[仔细分析以上试题,并作出正确选择]
正确答案是:
B
30.()thatconnectsatleasttwonetworksmakesdecisionaboutthebestroutefordata.
A.Amodem
B.Anetworkcard
C.Ahub
D.Arouter(路由器)
[仔细分析以上试题,并作出正确选择]
正确答案是:
D
二、完型填空(共2道试题,共40分)
1.##thedirectcurrentisuseful,ithasonegreat##,thatis,thereisnoeasy,economicalwaytoincreaseordecreaseits##.Thealternatingcurrenthasnotthisdisadvantage.##aspecialdevice,itis##totransformahighvoltageintoa##voltageoralowvoltageintoahighvoltage.The##thatweusetotransformthevoltageiscalleda##.Thealternatingcurrentcan##bechangedeasilyintothedirectcurrent.Thedevicewhichcandothisisspokenofasa##.
(1).
A.Also
B.Although
C.As
D.For
(2).
A.meaning
B.thing
C.advantage
D.disadvantage
(3).
A.resistance
B.capacitance
C.voltage
D.current
(4).
A.Making
B.Marking
C.Using
D.Having
(5).
A.possible
B.impossible
C.easy
D.different
(6).
A.high
B.low
C.large
D.small
(7).
A.thing
B.machine
C.one
D.device
(8).
A.transfer
B.transformer
C.change
D.charge
(9).
A.also
B.easily
C.hard
D.but
(10).
A.receiver
B.remote
C.rectifier
D.refiner
[仔细分析以上试题,并作出正确选择]
正确答案是:
(1).B
(2).D(3).C(4).C(5).A(6).B(7).D(8).B(9).A(10).C
2.Thereare##indsofcurrent:
directcurrent(DC)andalternating##(AC).Adirectcurrentisacurrentflowingina##alwaysinonedirection.##alternatingcurrentisacurrent##changingitsdirectionofflow.Theelectriccurrent##throughelectric##linesis##current.ThisisbecauseACiseasyto##andmoreeconomicalwhenwetransmititoverlong##.
(1).
A.one
B.two
C.three
D.four
(2).
A.conductor
B.coincidence
C.current
D.currency
(3).
A.current
B.currency
C.semiconductor
D.conductor
(4).
A.A
B.An
C.The
D.That
(5).
A.probably
B.periodically
C.timely
D.second
(6).
A.transmitted
B.transported
C.transformed
D.unlighted
(7).
A.powder
B.energy
C.poured
D.power
(8).
A.alternative
B.always
C.alternating
D.alter
(9).
A.consider
B.console
C.control
D.consent
(10).
A.time
B.distances
C.way
D.ago
[仔细分析以上试题,并作出正确选择]
正确答案是:
(1).B
(2).C(3).D(4).B(5).B(6).A(7).D(8).C(9).C(10).B
- 配套讲稿:
如PPT文件的首页显示word图标,表示该PPT已包含配套word讲稿。双击word图标可打开word文档。
- 特殊限制:
部分文档作品中含有的国旗、国徽等图片,仅作为作品整体效果示例展示,禁止商用。设计者仅对作品中独创性部分享有著作权。
- 关 键 词:
- 专业英语 秋西交 专业 英语 在线 作业 答案