三副航海英语习题讲解3

2017Keyword10:RadarandARPA(60)A335.Radarmakesitpossibleandmuchsaferforustosail__.A.indensefogB.inboisterousweatherC.intheopenseaD.inrivers【知识点】雷达的使用【解析】主要作用：雾航B380.Radarmakesthemostaccuratedeterminationofthe__.directionofatargetB.distancetoatargetC.sizeofatargetD.shapeofatarget【知识点】雷达的使用【解析】雷达测距最准确。相关题目A382.Withoutdoubttheradarisahighlyimportantnavigationaid.Butdutyofficershallawarethat_whenusingit.A.ItsrangereadingismoreaccuratethanitsbearingreadingAlow-lyingcoastlinewithalong,flatbeachwillshowupproperlyontheradar.Radarisonlyaimedatcollisionavoidance.theuseofradarisnecessaryonlywhenvisibilityisrestricted>D527.Radarisnotonlytoobtain,butalsotomeasuretheirdistanceawayfromyou.brightnessofobjects B.coloroftargetsC.shapeoftargets D.bearingofobjectsD361.WhichstatementconcerningtheoperationofradarinfogisTURE?A.radarrangesarelessaccurateinfognavigationbuoyswillalwaysshowuponradarasandybeachwillshowupcleareronradarthanarockycliffsmallwoodenboatsmaynotshowuponradarB327.Thecorrectmethodofswitchingoffamarineradaristoturnpowerswitchto positionfirst,thento position.A.off/standbyB.standby/offC.standby/closeD.close/standby【知识点】雷达的使用【解析】雷达关机步骤。B606、Astheradarantennascansthrough arotation,itcanbeshowwherethetargetisrelativetoyourposition.A.60degreeB.360degreeC.180degreeD.90degree【知识点】雷达的使用【解析】雷达天线。A345.Theradarcontrolthatreducesweakechoesouttoalimiteddistancefromtheshipisthe__A.sensitivitytimecontrol(sea-cluttercontrol)B.receivergaincontrolC.brilliancecontrol D.fasttimeconstant(differentiator)【知识点】雷达的使用(控钮)【解析】近距离的杂波相关题目D346.Theradarcontrolthatshortensallechoesonthedisplayandreducescluttercausedbyrainorsnowisthe.A.sensitivitytimecontrol(seacluttercontrol) B.receivergaincontrolC.brilliancecontrol D.fasttimeconstant(differentiator)D372.isonthepanelofradar.A.KEYLOCKB.REPEATER C.STATICINVERTER D.ANTI-CLUTTER-SEAA391.WhatisthepurposeofVRMcontrol?A.Tomeasuredistanceaccurately B.TomeasurebearingaccuratelyC.Tomeasurerangeandbearing D.Toadjustradarmonitor【知识点】雷达的使用【解析】活动距标圈。D557.SWEEPINTonradarpanelistheabbreviationof ．A．sweepintroductionB．sweepinterestC．sweepintention D．sweepintensity【知识点】雷达的使用【解析】扫描亮度A605、Whenwillyouhavetoadjustgain?A.everytimeyouchangerangesB.eachwatchC.everydayD.everyweek【知识点】雷达的使用【解析】增益：每次改变量程后需重新调整。D352.Whenhittingasolidobjectsuchasashiporanairplane,theradarwavesarereflectedback hewayB.thewayC.bythewayD.throughthepath【知识点】雷达的工作原理【解析】雷达波路径B360.WhichgeneralstatementconcerningradarisFALSE?A.raisingtheantennaheightincreasestheradarrangetheabilityofradartodetectobjectsisunaffectedbyweatherconditionsradarbearingarelessaccuratethanradarrangeradarshouldbecheckedregularlyduringclearweathertoensurethatitisoperatingproperly【知识点】雷达的工作原理【解析】雷达探测物标的能力会受到天气的影响。A348.Theradiowavesusedforradarareveryshort，only long．A．afewcentimetersB．afewfathomsC．afewmeters D．afewfeet【知识点】雷达技术指标（波长）【解析】航海雷达主要是3cm和10cmC336.The10-cmradarascomparedtoa3-cmradarofsimilarspecificationswill .bemoresuitableforriverandharbornavigationprovidebetterrangeperformanceonlowlyingtargetsduringgoodweatherandcalmseashaveawiderhorizontalbeamwidthhavemoreseareturnduringroughseaconditions【知识点】雷达技术指标（波长）【解析】1）最大作用距离：正常天气下，3cm雷达的大；雨雪天，10cm雷达的大。2）距离分辨力和测距精度：波长短，脉冲前沿短，脉冲宽度短一一3cm好。3）方位分辨力和测方位精度：波长越短，波束宽度越窄—一3cm好。4）抗杂波能力：10cm好。相关题目D337.The3-cmradarascomparedtoa10-cmradarwithsimilarspecificationswill.givebetterrangeperformanceinrain,hail,etc.displaysmalltargetsinamassofdenseseaclutteratagreaterrangehavelessseareturninchoppyroughseasdisplayamoremaplikepresentationforinshorenavigationA364.Coralatolls,orachainofislandsatrightanglestotheradarbeam,mayshowasalonglineratherthanasindividualtargetsdueto .A.theeffectsofbeamwidth B.limitationsonrangeresolutionC.thepulselengthoftheradar D.themultiple-targetresolutionfactor【知识点】雷达技术指标(天线波束宽度)【解析】天线水平波束宽度对方位分辨力的影响。A237.Youareusingradarinwhichyourownshipisshownatthecenter,andtheheadingflashalwayspointsto00.Ifbearingsaremeasuredinrelationtotheflash,___bearingareproduced.relativeB.trueC.compassD.acircleappearingonthescopesurroundingthelight【知识点】雷达显示方式【解析】首向上显示方式B331.Youhavebeenobservingyourradarscreenandnoticethatacontactonthescreenhasremainedinthesameposition,relativetoyou,forseveralminutes.Yourvesselismaking10knotsthroughthewater.WhichstatementisTRUE?A.ThecontactisdeadinthewaterThecontactisonthesamecourseandspeedasyourvesselThecontactisonareciprocalcourseatthesamespeedasyourvesselTheradarisshowingfalseechoesandisprobablydefective【知识点】雷达显示方式【解析】相对运动相关题目C374.Aradarcontactwillremainstationaryonarelativemotionradardisplayonlywhenitis.onthesamecourseasyourvesselatthesamespeedasyourvesselonthesamecourseandspeedasyourvesselonareciprocalcourseatthesamespeedasyourvesselD363.Youareunderwayat5knotsandseeonyourradaracontact10milesdirectlyasternofyou.12minuteslatter,thecontactis8milesdirectlyasternofyou.Whatistheestimatedspeedofthecontact?A.deadinthewaterB.1knotC.10knotsD.15knots【知识点】雷达显示方式【解析】相对运动：d=(V2-V1)tC353.Whenusingaradarinaunstabilizedmode,fixesaredeterminedmosteasilyfrom .A.centerbearingsB.tangentbearingsC.rangesD.objectsthatarecloseaboard【知识点】雷达显示方式【解析】不稳定显示方式——首向上，航向变，方位变。B375.AradardisplayinwhichNorthisalwaysatthetopofthescreenisa(n) .A.unstabilizeddisplayB.stabilizeddisplayC.compositiondisplayD.relativedisplay【知识点】雷达显示方式【解析】北向上——稳定显示方式。相关题目C376.Aradardisplaywhichisoriented,(标定方向)sothatnorthisalwaysatthetopofthescreen,iscalleda(n)__A.relativedisplayB.compositedisplayC.stabilizeddisplayD.unstabilizeddisplayC392.Whatcourseshouldbefedintoastabilizedradarpicture?A.CompasscourseB.GyrocourseC.TruecourseD.Coursemadegood【知识点】雷达显示方式【解析】稳定显示方式：使用航向为真航向。A529.Yourradarissetonatruemotiondisplay.WhichofthefollowingwillNOTappeartomoveacrossthePPIscope?EchoesfromabuoyOwnship'smarkerEchofromashiponthesamecourseatthesamespeedEchofromashiponareciprocalcourseatthesamespeed【知识点】真运动【解析】真运动模式A339.Whenthesystemdeterminesthatacollisionsituationexists,thetargetcausingthealarmconditionareidentifiedon{PPI}byabrightTadjacentthereto.A.planpositionindicator B.planepositionindicatorC.policyproofofinterest D.policyproofofinterest【知识点】雷达显示【解析】平面位置显示器相关题目B377.Aradarrangetoasmall,chartedobjectsuchasalightwillprovidealineofpositioninwhichform?StraightlineB.ArcC.ParabolaD.Hyperbola【知识点】雷达测距【解析】距离位置线C330.Anavigatorfixingavessel’spositionbyradar .A.shouldneveruseradarbearingsshouldonlyuseradarbearingswhentherangeexceedsthedistancetothehorizoncanuseradarinformationfromoneobjecttofixthepositionmustuseinformationfromtargetsforwardofbeam【知识点】雷达定位【解析】雷达定位方法。相关题目B342.Thecommonwaytoobtainyourship'spositionis.A.keepingaclosewatchandlookout B.takingaradarrangeandbearingC.observingaradartargetandlisteningtosignals D.keepingawellclearcautionC356.Whenusingtheradarfornavigating .Thebestfixisobtainedbyusingatangentbearingandarange.Andusingtworadarrangesforafix,theobjectsoftherangesshouldbeclosedtoreciprocalbearings.Andusingranges,themostrapidlychangingrangeshouldbemeasuredlast.Andcrossingaradarrangeofoneobjectwiththevisualbearingofasecondobject,thetwoobjectsshouldbe80°to110°apart.【知识点】雷达定位【解析】测距定位时，距离变化快的后测。A341.InradarplottingC.P.A.istheabbreviationof .closestpointtoapproach B.closepointtoapproachC.crossingpointtoapproach D.fogorsteadyrain【知识点】雷达标绘【解析】CPAC340.Theclosestpointofapproach(CPA)ofacontactonarelativemotionradarmaybedetermined .A.immediatelywhenthecontactisnotedonradaronlyiftheradarscopeiswatchedconstantlyafterthecontacthasbeenmarkedatleasttwicebyanoccasionalglanceattheradar【知识点】雷达标绘【解析】CPA的标绘方法：固定的时间间隔确定两个以上位置，连线即得相对运动线。相关题目A394.Howdoescurrentanddrifteffecttherelativemotion,relativevectorpresentation?A.Noeffect B.ProducingsmallerrorsincalculatedaspectC.ProducinglargeerrorsincalculatedaspectD.ProduceerrorsincalculatedCPA/TCPAB395.DoescurrentanddrifteffecttheCPA/TCPAcalculationsonatruemotiondisplay?A.YesB.NoC.OnlyalittlebitD.Yes,veryseriouslyB381.Anindirectradarechoiscausedbyareflectionofthemainlobeoftheradarbeamofftheobserver’svessel.Whichofthefollowingisnotacharacteristicofindirectechoes?Theirbearingisalmostconstant,evenwhenthetruebearingofthecontactchangesappreciablyTheyalwaysappearonabearingof90degreesfromthetruebearingofthecontactTheindirectechoesusuallyappearinshadowsectorsWhenplotted,theirmovementsareusuallyabnormal【知识点】假回波【解析】间接反射假回波：雷达波经烟囱、大桅等间接反射到目标，目标回波经原路线回到天线形成。特点：在阴影区内，一般方位不变。A549.Youhaveanothershipovertakingyoucloseaboardtostarboard.Youhave3radartargetsbearing090°relativeatrangesof0.5mile，1mile，and1.5miles.Inthiscase，theunwantedechoesarecalled .A.multipleechoesB.spoking C.indirectechoesD.side-lobeechoes【知识点】假回波【解析】多次反射假回波：等间距，强度逐渐减弱。A359.Whichconditionindicatesthatyourradarneedsmaintenance?A.SerratedrangeringsB.IndirectechoesC.MultipleechoesD.Blindsector【知识点】雷达故障【解析】固定距标圈呈现锯齿状时，雷达需要维修。B543.Radarbeaconsaretransmittersdesignedtoproducea__onthescreensofship’sradarsets.A.incorrectimageB.distinctiveimageC.pictorialimageD.pictographicimage【知识点】雷达信标【解析】雷达信标在雷达屏幕上产生独特的图像。D236.YouareapproachingalightfittedwithaRACON.Thelightmaybeidentifiedontheradarby___.adashedlinerunningfromthecenterofthescopetothelightanaudiblesignalwhenthesweepcrossesthelightacircleappearingonthescopesurroundingthelightacodedsignalappearingonthesamebearingatagreaterrangethanthelight【知识点】雷达信标【解析】雷达信标在雷达上的图像。相关题目A362.YouarescanningtheradarscreenforabuoyfittedwithRacon.HowshouldthissignalappearonthePPIdisplay？startingwithadashandextendingrapidlyoutwardfromthetargetasabrokenlinefromcenterofPPItothetargetstartingwithadotandextendingrapidlyinwardfromthetargetstartingwithadashandextendingtotherightofthetargetA332.Itmaybefoundthat,incertaincircumstances,RaderBeaconcancauseunwantedinterferenceparticularly .atcloserangeB.atendonsituationC.atheadonsituationD.atcrossingsituation【知识点】雷达信标【解析】近距离可能导致干扰杂波。相关题目A554.Itmaybefoundthat,incertaincircumstances,RaderBeaconemissionscancausewiththenormalradardisplay,particularlyatcloserange.A.unwantedinterferenceB.unexpectedfiguresC.abnormaldataD.unwantedinformationD384.WhatdoesaRaconhelpwith?A.Measuringthedistance B.MeasuringtherelativespeedC.Identifyingavessel D.IdentifyingaseamarkC387.Whatisacodedracon?A.AraconwhichautomaticallyactivateitselfAracononlyworkingatnightAraconwhichdisplayamorsecodeontheradarscreenAfutureraconexpectedtobeoperationalafterY2000A385.HowisanuncodedRacondisplayedonthePPI?A.AsalineB.AsadotC.AssmallcircleD.AsalargecircleA386.WhattypeofradarcanactivateaRacon?A.X-bandradarB.S-bandradarC.C-bandradarD.NoradarcanD540.Inordertoinsurethattheraconsignalisvisibleonyour3cmradar,the.10cmradarshouldbeplacedonstandbyorturnedoffgaincontrolshouldbeturnedtomaximumradarshouldbestabilized,headupraincluttercontrolshouldbeoffbut,ifnecessary,maybeonlowB344.Thefittingofanefficientradarreflectorislikelytoconsiderablyincreasetheship’sprobabilityof A.detection B.beingdetectedC.thedetectiveD.thedetected【知识点】雷达反射器【解析】提高被探测到的可能性。相关题目D388.Whatisthepurposeoftheradarreflector?Makingobjectslessvisible B.MakingechoesweakerontheradarC.Makinglargeechoessmaller D.MakingsmallobjectsbettervisibleB393.WhatisthecorrectspeedinputtoanARPAusedfortrafficsurveillance?A.GroundspeedB.SpeedthroughwaterC.SpeedfromGPSD.SpeedfromDoppler【知识点】ARPA工作原理【解析】交通监管用的ARPA应输入对水速度。D338.TheARPAmayswaptargetswhenautomaticallytrackingiftwotargets A.aretrackedonreciprocalbearings B.aretrackedatthesamerangeC.aretrackedonthesamebearing D.passclosetogether【知识点】ARPA自动跟踪存在的问题【解析】自动跟踪时，如果两个目标相邻太近，ARPA可能会发生目标调换（误跟踪）。两个或两个以上目标落入同一个波门而引起跟踪错误的现象B350.WhatisTRUEofthehistorydisplayofatarget’spastpositionsonaARPA?A.Itprovidesagraphicdisplaytoemphasizewhichvesselisonacollisioncourse.Inthetruepresentation,itprovidesaquickvisualchecktodetermineifavesselhaschangedcourse.Thedisplayisoneoftheprimaryinputsandmustbeinusewhenusingthetrialmaneuvercapability.Itprovidesagraphicdisplayofatargetvessel’srelativecourse,speed,andCPA.【知识点】ARPA的尾迹【解析】尾迹主要是能快速发现来船的是否存在机动。C351.WhatwillcausetheARPAtoemitavisualalarm,audiblealarm,orboth?AnacquiredtargetenteringintoaguardzoneAtrackedtargetlostforoneradarscanAtrackedtargetenteringyourpresetCPA-TCPAlimitsAtargetbeinginitiallydetectedwithinaguardzone【知识点】ARPA报警【解析】跟踪的目标的参数小于预设的CPA-TCPA时会发生报警。B354.WhenusinganARPA,whatshouldyouconsiderinordertoevaluate（评估，评价）theinformationdisplayed?Thetargetvessel’sgeneratedcourseandspeedarebasedsolelyonradarinputs.Navigationalconstraints（限制，约束）mayrequireatargetvesseltochangecourse.Thetrialmaneuverfeaturewillautomaticallydetermineacoursethatwillclearalltarget.DYoucannotdetermineifasmalltargethasbeenlostduetoseareturn.【知识点】ARPA的使用【解析】航海的限制要求可能要求目标船改向。B358.WhichARPAdatashouldyouuseinordertodetermineifaclosequarterssituationwilldevelopwithatargetvessel?Setanddriftofthecurrent B.RelativetrackinformationC.PredictedtimeofCPA D.Initialrangeofacquisition【知识点】ARPA的使用【解析】判断是否会形成紧迫局面的ARPA参数是相对运动线的信息。A538.YourARPAhasbeentrackingatargetandhasgeneratedthetargetscourseandspeed．Theradardidnotreceiveatargetechoonitslasttwoscansduetotheweather．Whatshouldyouexpectunderthesecircumstances?A．TheARPAwillgeneratedataasifthetargetwasstillbeingtrackedbyradarB．TheARPAwillgiveanaudibleand/orvisuallosttargetalarmC．TheARPAwillgeneratedatabasedonseareturnechoesfromthevicinitywherethetargetwaslostD．TheARPAhaslostallmemoryofthetargetandmustrecomputethetargetdata【知识点】ARPA的使用【解析】连续三次未扫描到会发生目标丢失。D544.YourARPAhasautomaticspeedinputsfromthelog.Duetocurrents,thelogisindicatingafasterspeedthanthespeedovertheground.Whatshouldyouexpectunderthesecircumstances?A.ThegeneratedCPAwillbelessthantheactualCPA.ThegeneratedTCPAwillbelaterthantheactualTCPA.TherangeofinitialtargetacquisitionwillbelessthannormalThetargetstruecoursevectorwillbeinerror【知识点】ARPA的使用【解析】ARPA的输入速度错误，将会导致目标船的矢量计算错误。Keyword11:GPS（9）C493.TheGPSsatelliteorbitstheearthinapproximately .A.3hoursB.6hoursC.12hoursD.24hours【知识点】GPS卫星【解析】轨道运行周期约12小时准确的时间为下面：

C618、Theorbitalperiodisone-halfasiderealday,i.e .A.12hoursB.8hoursC.11hoursand58minutesD.12hoursand2minutesD494.RegardingtheuseofGPS,whichoneofthefollowingsisincorrect?GPSisthemostaccurateglobalsystemtodayItsuseisstillundertheU.S.DepartmentofDefence’scontrolDGPSismoreaccuratethanGPSGPScanprovideareal-timepositionunderanycondition【知识点】GPS【解析】real-timeposition实时船位C485.WhichstatementaboutsatellitenavigationisTRUE?Whileafixcanbegeneratedbysignalsreceivedfromtwosatellites,threesatellitesarenecessaryforreliableaccuracy.（三星二维定位、四星三维定位）Thesatellitesareinequatorialorbitsaroundtheearthabout60°oflongitudeapart（平均分布于个轨道，轨道的升交点赤经各相差6度0）ThesatellitenavigationsystemdeterminesafixbymeasuringtheDopplershiftoftheradiosignalsfromthesatelliteTheship’sreceivercannotbeginprocessingdatauntiltheantennalocksontothesatelliteandstartscontinuoustracking【知识点】GPS【解析】关于GPS的描述正确的是：采用测量卫星的无线电信号多普勒频移来定位。C499.If isshutdownforanextendedtime,optimumpositionfixingwilltakeupto2hoursafterpowerisreapplied.A.radar B.DFC.SatelliteNavigatorD.AutomaticOmegaNavigator【知识点】GPS冷启动【解析】GPS长时间关机，重新开机后最佳定位时间在2小时后。C553.MostGPSreceiversusetheDopplershiftofthecarrierphasetocomputeA.latitudeB.longitudeC.speedD.time【知识点】GPS【解析】多数GPS接收机使用载波相位的多普勒频移技术来计算速度。C569.WhichstatementconcerningGPSisTRUE?Itcannotbeusedinallpartsoftheworld.B.Thereare12functioningGPSsatellitesatpresent.D.Twopositionlinesareusedtogivea2Dfix.B.DecreasepositioningaccuracyD.Idon’tknowD.Twopositionlinesareusedtogivea2Dfix.B.DecreasepositioningaccuracyD.Idon’tknow【知识点】GPS的使用【解析】GPS可以随时中止提供服务。A497.WhatisthemainpurposeofDGPS?A.ImprovepositioningaccuracyC.Reduceoperationalcost【知识点】DGPS【解析】DGPS的主要作用是提高定位精度。相同题目B620、Atechniquereferredtoas allowsuserstoobtainmaximumaccuracyfromtheGPSsystem.A.AISB.DGPSC.ARPAD.RBSKeyword12:AISandVDR（13）A503、automaticallyprovidestheship'snauticalofficerswithimportantinformationaboutnearbyvesselsorotherrelevantobjectswithinVHFrang.A.AISB.ECDISC.GPS D.VDR【知识点】AIS的作用【解析】AIS自动地提供给船舶驾驶员在VHF有效距离内的船舶或其他目标的重要信息。、相同题目A520.TheAIStransponderisdesignedtotransmitinformation.A.automaticallyB.semi-automaticallyC.manuallyD.AISisnottransmittingatallA504.The transmitsownshipdatacyclicallyviatwodefinedVHFchannelsandreceivesthesamedataoftheothershipsandobjectsthatareequippedwithAISsystems.A.AIS B.ECDIS C.GPSD.VDR【知识点】AIS的作用【解析】AIS通过两个预设的VHF频道循环地发送本船信息，并且接收装有AIS的其他船舶和目标的同样的信息。A516.WhatisimportanttorememberwhenusingAISforcollisionavoidance?A.AISmaynotgiveacompletepictureofthetrafficsituationAISismoreaccuratethanARPAAISisnotasaccurateasARPAAISisnotallowedtobeusedforcollisionavoidance【知识点】AIS的使用【解析】AIS用于避碰时需要记住：AIS不能以画面的方式显示附近交通情况。C518.IncaseofAISoverload,whatcanyouexpect?A.AISwillshutdown B.AISwill“freeze”C.Targetsfarawaydropout D.Closetargetsdropout【知识点】AIS的容量【解析】如果AIS信息容量过载，则自动过滤远距离目标。相关题目C521.HowmuchcantheAISbroadcastmodebeoverloadedwithoutanysignificantoperationaleffect?A.50%~100% B.200%~300% C.400%~500%D.nooverloadisacceptedC519.Whichofthefollowingisdefinedasstaticinformation?A.NavigationalstatusB.safetyrelatedmessagesC.MMSID.Routeplan【知识点】AIS静态信息【解析】静态信息包括：IMO编号，船名与呼号，船长与宽度，船型，定位天线在船上的位置。MMSI：MaritimeMobileServiceIdentity海事移动业务识别码A564.Automaticidentificationsystem(AIS)areexpectedtobroadcastallofthefollowinginformationexcept.A.portoforigin B.nameofvesselC.courseandspeedovergroundD.draftofvessel【知识点】AIS提供的信息【解析】不能提供始发港。相同题目C565.Automaticidentificationsystems(AIS)areexpectedtobroadcastallofthefollowinginformation|EXCEPT.A:navigationstatusB:ship'sheadingC: