三副航海英語習(xí)題講解3

2017Keyword10:RadarandARPA(60)A335.Radarmakesitpossibleandmuchsaferforustosail__.A.indensefogB.inboisterousweatherC.intheopenseaD.inrivers【知識點】雷達的使用【解析】主要作用：霧航B380.Radarmakesthemostaccuratedeterminationofthe__.directionofatargetB.distancetoatargetC.sizeofatargetD.shapeofatarget【知識點】雷達的使用【解析】雷達測距最準確。相關(guān)題目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【知識點】雷達的使用【解析】雷達關(guān)機步驟。B606、Astheradarantennascansthrough arotation,itcanbeshowwherethetargetisrelativetoyourposition.A.60degreeB.360degreeC.180degreeD.90degree【知識點】雷達的使用【解析】雷達天線。A345.Theradarcontrolthatreducesweakechoesouttoalimiteddistancefromtheshipisthe__A.sensitivitytimecontrol(sea-cluttercontrol)B.receivergaincontrolC.brilliancecontrol D.fasttimeconstant(differentiator)【知識點】雷達的使用(控鈕)【解析】近距離的雜波相關(guān)題目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【知識點】雷達的使用【解析】活動距標圈。D557.SWEEPINTonradarpanelistheabbreviationof ．A．sweepintroductionB．sweepinterestC．sweepintention D．sweepintensity【知識點】雷達的使用【解析】掃描亮度A605、Whenwillyouhavetoadjustgain?A.everytimeyouchangerangesB.eachwatchC.everydayD.everyweek【知識點】雷達的使用【解析】增益：每次改變量程后需重新調(diào)整。D352.Whenhittingasolidobjectsuchasashiporanairplane,theradarwavesarereflectedback hewayB.thewayC.bythewayD.throughthepath【知識點】雷達的工作原理【解析】雷達波路徑B360.WhichgeneralstatementconcerningradarisFALSE?A.raisingtheantennaheightincreasestheradarrangetheabilityofradartodetectobjectsisunaffectedbyweatherconditionsradarbearingarelessaccuratethanradarrangeradarshouldbecheckedregularlyduringclearweathertoensurethatitisoperatingproperly【知識點】雷達的工作原理【解析】雷達探測物標的能力會受到天氣的影響。A348.Theradiowavesusedforradarareveryshort，only long．A．a(chǎn)fewcentimetersB．a(chǎn)fewfathomsC．a(chǎn)fewmeters D．a(chǎn)fewfeet【知識點】雷達技術(shù)指標（波長）【解析】航海雷達主要是3cm和10cmC336.The10-cmradarascomparedtoa3-cmradarofsimilarspecificationswill .bemoresuitableforriverandharbornavigationprovidebetterrangeperformanceonlowlyingtargetsduringgoodweatherandcalmseashaveawiderhorizontalbeamwidthhavemoreseareturnduringroughseaconditions【知識點】雷達技術(shù)指標（波長）【解析】1）最大作用距離：正常天氣下，3cm雷達的大；雨雪天，10cm雷達的大。2）距離分辨力和測距精度：波長短，脈沖前沿短，脈沖寬度短一一3cm好。3）方位分辨力和測方位精度：波長越短，波束寬度越窄—一3cm好。4）抗雜波能力：10cm好。相關(guān)題目D337.The3-cmradarascomparedtoa10-cmradarwithsimilarspecificationswill.givebetterrangeperformanceinrain,hail,etc.displaysmalltargetsinamassofdenseseaclutteratagreaterrangehavelessseareturninchoppyroughseasdisplayamoremaplikepresentationforinshorenavigationA364.Coralatolls,orachainofislandsatrightanglestotheradarbeam,mayshowasalonglineratherthanasindividualtargetsdueto .A.theeffectsofbeamwidth B.limitationsonrangeresolutionC.thepulselengthoftheradar D.themultiple-targetresolutionfactor【知識點】雷達技術(shù)指標(天線波束寬度)【解析】天線水平波束寬度對方位分辨力的影響。A237.Youareusingradarinwhichyourownshipisshownatthecenter,andtheheadingflashalwayspointsto00.Ifbearingsaremeasuredinrelationtotheflash,___bearingareproduced.relativeB.trueC.compassD.acircleappearingonthescopesurroundingthelight【知識點】雷達顯示方式【解析】首向上顯示方式B331.Youhavebeenobservingyourradarscreenandnoticethatacontactonthescreenhasremainedinthesameposition,relativetoyou,forseveralminutes.Yourvesselismaking10knotsthroughthewater.WhichstatementisTRUE?A.ThecontactisdeadinthewaterThecontactisonthesamecourseandspeedasyourvesselThecontactisonareciprocalcourseatthesamespeedasyourvesselTheradarisshowingfalseechoesandisprobablydefective【知識點】雷達顯示方式【解析】相對運動相關(guān)題目C374.Aradarcontactwillremainstationaryonarelativemotionradardisplayonlywhenitis.onthesamecourseasyourvesselatthesamespeedasyourvesselonthesamecourseandspeedasyourvesselonareciprocalcourseatthesamespeedasyourvesselD363.Youareunderwayat5knotsandseeonyourradaracontact10milesdirectlyasternofyou.12minuteslatter,thecontactis8milesdirectlyasternofyou.Whatistheestimatedspeedofthecontact?A.deadinthewaterB.1knotC.10knotsD.15knots【知識點】雷達顯示方式【解析】相對運動：d=(V2-V1)tC353.Whenusingaradarinaunstabilizedmode,fixesaredeterminedmosteasilyfrom .A.centerbearingsB.tangentbearingsC.rangesD.objectsthatarecloseaboard【知識點】雷達顯示方式【解析】不穩(wěn)定顯示方式——首向上，航向變，方位變。B375.AradardisplayinwhichNorthisalwaysatthetopofthescreenisa(n) .A.unstabilizeddisplayB.stabilizeddisplayC.compositiondisplayD.relativedisplay【知識點】雷達顯示方式【解析】北向上——穩(wěn)定顯示方式。相關(guān)題目C376.Aradardisplaywhichisoriented,(標定方向)sothatnorthisalwaysatthetopofthescreen,iscalleda(n)__A.relativedisplayB.compositedisplayC.stabilizeddisplayD.unstabilizeddisplayC392.Whatcourseshouldbefedintoastabilizedradarpicture?A.CompasscourseB.GyrocourseC.TruecourseD.Coursemadegood【知識點】雷達顯示方式【解析】穩(wěn)定顯示方式：使用航向為真航向。A529.Yourradarissetonatruemotiondisplay.WhichofthefollowingwillNOTappeartomoveacrossthePPIscope?EchoesfromabuoyOwnship'smarkerEchofromashiponthesamecourseatthesamespeedEchofromashiponareciprocalcourseatthesamespeed【知識點】真運動【解析】真運動模式A339.Whenthesystemdeterminesthatacollisionsituationexists,thetargetcausingthealarmconditionareidentifiedon{PPI}byabrightTadjacentthereto.A.planpositionindicator B.planepositionindicatorC.policyproofofinterest D.policyproofofinterest【知識點】雷達顯示【解析】平面位置顯示器相關(guān)題目B377.Aradarrangetoasmall,chartedobjectsuchasalightwillprovidealineofpositioninwhichform?StraightlineB.ArcC.ParabolaD.Hyperbola【知識點】雷達測距【解析】距離位置線C330.Anavigatorfixingavessel’spositionbyradar .A.shouldneveruseradarbearingsshouldonlyuseradarbearingswhentherangeexceedsthedistancetothehorizoncanuseradarinformationfromoneobjecttofixthepositionmustuseinformationfromtargetsforwardofbeam【知識點】雷達定位【解析】雷達定位方法。相關(guān)題目B342.Thecommonwaytoobtainyourship'spositionis.A.keepingaclosewatchandlookout B.takingaradarrangeandbearingC.observingaradartargetandlisteningtosignals D.keepingawellclearcautionC356.Whenusingtheradarfornavigating .Thebestfixisobtainedbyusingatangentbearingandarange.Andusingtworadarrangesforafix,theobjectsoftherangesshouldbeclosedtoreciprocalbearings.Andusingranges,themostrapidlychangingrangeshouldbemeasuredlast.Andcrossingaradarrangeofoneobjectwiththevisualbearingofasecondobject,thetwoobjectsshouldbe80°to110°apart.【知識點】雷達定位【解析】測距定位時，距離變化快的后測。A341.InradarplottingC.P.A.istheabbreviationof .closestpointtoapproach B.closepointtoapproachC.crossingpointtoapproach D.fogorsteadyrain【知識點】雷達標繪【解析】CPAC340.Theclosestpointofapproach(CPA)ofacontactonarelativemotionradarmaybedetermined .A.immediatelywhenthecontactisnotedonradaronlyiftheradarscopeiswatchedconstantlyafterthecontacthasbeenmarkedatleasttwicebyanoccasionalglanceattheradar【知識點】雷達標繪【解析】CPA的標繪方法：固定的時間間隔確定兩個以上位置，連線即得相對運動線。相關(guān)題目A394.Howdoescurrentanddrifteffecttherelativemotion,relativevectorpresentation?A.Noeffect B.ProducingsmallerrorsincalculatedaspectC.ProducinglargeerrorsincalculatedaspectD.ProduceerrorsincalculatedCPA/TCPAB395.DoescurrentanddrifteffecttheCPA/TCPAcalculationsonatruemotiondisplay?A.YesB.NoC.OnlyalittlebitD.Yes,veryseriouslyB381.Anindirectradarechoiscausedbyareflectionofthemainlobeoftheradarbeamofftheobserver’svessel.Whichofthefollowingisnotacharacteristicofindirectechoes?Theirbearingisalmostconstant,evenwhenthetruebearingofthecontactchangesappreciablyTheyalwaysappearonabearingof90degreesfromthetruebearingofthecontactTheindirectechoesusuallyappearinshadowsectorsWhenplotted,theirmovementsareusuallyabnormal【知識點】假回波【解析】間接反射假回波：雷達波經(jīng)煙囪、大桅等間接反射到目標，目標回波經(jīng)原路線回到天線形成。特點：在陰影區(qū)內(nèi)，一般方位不變。A549.Youhaveanothershipovertakingyoucloseaboardtostarboard.Youhave3radartargetsbearing090°relativeatrangesof0.5mile，1mile，and1.5miles.Inthiscase，theunwantedechoesarecalled .A.multipleechoesB.spoking C.indirectechoesD.side-lobeechoes【知識點】假回波【解析】多次反射假回波：等間距，強度逐漸減弱。A359.Whichconditionindicatesthatyourradarneedsmaintenance?A.SerratedrangeringsB.IndirectechoesC.MultipleechoesD.Blindsector【知識點】雷達故障【解析】固定距標圈呈現(xiàn)鋸齒狀時，雷達需要維修。B543.Radarbeaconsaretransmittersdesignedtoproducea__onthescreensofship’sradarsets.A.incorrectimageB.distinctiveimageC.pictorialimageD.pictographicimage【知識點】雷達信標【解析】雷達信標在雷達屏幕上產(chǎn)生獨特的圖像。D236.YouareapproachingalightfittedwithaRACON.Thelightmaybeidentifiedontheradarby___.adashedlinerunningfromthecenterofthescopetothelightanaudiblesignalwhenthesweepcrossesthelightacircleappearingonthescopesurroundingthelightacodedsignalappearingonthesamebearingatagreaterrangethanthelight【知識點】雷達信標【解析】雷達信標在雷達上的圖像。相關(guān)題目A362.YouarescanningtheradarscreenforabuoyfittedwithRacon.HowshouldthissignalappearonthePPIdisplay？startingwithadashandextendingrapidlyoutwardfromthetargetasabrokenlinefromcenterofPPItothetargetstartingwithadotandextendingrapidlyinwardfromthetargetstartingwithadashandextendingtotherightofthetargetA332.Itmaybefoundthat,incertaincircumstances,RaderBeaconcancauseunwantedinterferenceparticularly .atcloserangeB.atendonsituationC.atheadonsituationD.atcrossingsituation【知識點】雷達信標【解析】近距離可能導(dǎo)致干擾雜波。相關(guān)題目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【知識點】雷達反射器【解析】提高被探測到的可能性。相關(guān)題目D388.Whatisthepurposeoftheradarreflector?Makingobjectslessvisible B.MakingechoesweakerontheradarC.Makinglargeechoessmaller D.MakingsmallobjectsbettervisibleB393.WhatisthecorrectspeedinputtoanARPAusedfortrafficsurveillance?A.GroundspeedB.SpeedthroughwaterC.SpeedfromGPSD.SpeedfromDoppler【知識點】ARPA工作原理【解析】交通監(jiān)管用的ARPA應(yīng)輸入對水速度。D338.TheARPAmayswaptargetswhenautomaticallytrackingiftwotargets A.aretrackedonreciprocalbearings B.aretrackedatthesamerangeC.aretrackedonthesamebearing D.passclosetogether【知識點】ARPA自動跟蹤存在的問題【解析】自動跟蹤時，如果兩個目標相鄰太近，ARPA可能會發(fā)生目標調(diào)換（誤跟蹤）。兩個或兩個以上目標落入同一個波門而引起跟蹤錯誤的現(xiàn)象B350.WhatisTRUEofthehistorydisplayofatarget’spastpositionsonaARPA?A.Itprovidesagraphicdisplaytoemphasizewhichvesselisonacollisioncourse.Inthetruepresentation,itprovidesaquickvisualchecktodetermineifavesselhaschangedcourse.Thedisplayisoneoftheprimaryinputsandmustbeinusewhenusingthetrialmaneuvercapability.Itprovidesagraphicdisplayofatargetvessel’srelativecourse,speed,andCPA.【知識點】ARPA的尾跡【解析】尾跡主要是能快速發(fā)現(xiàn)來船的是否存在機動。C351.WhatwillcausetheARPAtoemitavisualalarm,audiblealarm,orboth?AnacquiredtargetenteringintoaguardzoneAtrackedtargetlostforoneradarscanAtrackedtargetenteringyourpresetCPA-TCPAlimitsAtargetbeinginitiallydetectedwithinaguardzone【知識點】ARPA報警【解析】跟蹤的目標的參數(shù)小于預(yù)設(shè)的CPA-TCPA時會發(fā)生報警。B354.WhenusinganARPA,whatshouldyouconsiderinordertoevaluate（評估，評價）theinformationdisplayed?Thetargetvessel’sgeneratedcourseandspeedarebasedsolelyonradarinputs.Navigationalconstraints（限制，約束）mayrequireatargetvesseltochangecourse.Thetrialmaneuverfeaturewillautomaticallydetermineacoursethatwillclearalltarget.DYoucannotdetermineifasmalltargethasbeenlostduetoseareturn.【知識點】ARPA的使用【解析】航海的限制要求可能要求目標船改向。B358.WhichARPAdatashouldyouuseinordertodetermineifaclosequarterssituationwilldevelopwithatargetvessel?Setanddriftofthecurrent B.RelativetrackinformationC.PredictedtimeofCPA D.Initialrangeofacquisition【知識點】ARPA的使用【解析】判斷是否會形成緊迫局面的ARPA參數(shù)是相對運動線的信息。A538.YourARPAhasbeentrackingatargetandhasgeneratedthetargetscourseandspeed．Theradardidnotreceiveatargetechoonitslasttwoscansduetotheweather．Whatshouldyouexpectunderthesecircumstances?A．TheARPAwillgeneratedataasifthetargetwasstillbeingtrackedbyradarB．TheARPAwillgiveanaudibleand/orvisuallosttargetalarmC．TheARPAwillgeneratedatabasedonseareturnechoesfromthevicinitywherethetargetwaslostD．TheARPAhaslostallmemoryofthetargetandmustrecomputethetargetdata【知識點】ARPA的使用【解析】連續(xù)三次未掃描到會發(fā)生目標丟失。D544.YourARPAhasautomaticspeedinputsfromthelog.Duetocurrents,thelogisindicatingafasterspeedthanthespeedovertheground.Whatshouldyouexpectunderthesecircumstances?A.ThegeneratedCPAwillbelessthantheactualCPA.ThegeneratedTCPAwillbelaterthantheactualTCPA.TherangeofinitialtargetacquisitionwillbelessthannormalThetargetstruecoursevectorwillbeinerror【知識點】ARPA的使用【解析】ARPA的輸入速度錯誤，將會導(dǎo)致目標船的矢量計算錯誤。Keyword11:GPS（9）C493.TheGPSsatelliteorbitstheearthinapproximately .A.3hoursB.6hoursC.12hoursD.24hours【知識點】GPS衛(wèi)星【解析】軌道運行周期約12小時準確的時間為下面：

C618、Theorbitalperiodisone-halfasiderealday,i.e .A.12hoursB.8hoursC.11hoursand58minutesD.12hoursand2minutesD494.RegardingtheuseofGPS,whichoneofthefollowingsisincorrect?GPSisthemostaccurateglobalsystemtodayItsuseisstillundertheU.S.DepartmentofDefence’scontrolDGPSismoreaccuratethanGPSGPScanprovideareal-timepositionunderanycondition【知識點】GPS【解析】real-timeposition實時船位C485.WhichstatementaboutsatellitenavigationisTRUE?Whileafixcanbegeneratedbysignalsreceivedfromtwosatellites,threesatellitesarenecessaryforreliableaccuracy.（三星二維定位、四星三維定位）Thesatellitesareinequatorialorbitsaroundtheearthabout60°oflongitudeapart（平均分布于個軌道，軌道的升交點赤經(jīng)各相差6度0）ThesatellitenavigationsystemdeterminesafixbymeasuringtheDopplershiftoftheradiosignalsfromthesatelliteTheship’sreceivercannotbeginprocessingdatauntiltheantennalocksontothesatelliteandstartscontinuoustracking【知識點】GPS【解析】關(guān)于GPS的描述正確的是：采用測量衛(wèi)星的無線電信號多普勒頻移來定位。C499.If isshutdownforanextendedtime,optimumpositionfixingwilltakeupto2hoursafterpowerisreapplied.A.radar B.DFC.SatelliteNavigatorD.AutomaticOmegaNavigator【知識點】GPS冷啟動【解析】GPS長時間關(guān)機，重新開機后最佳定位時間在2小時后。C553.MostGPSreceiversusetheDopplershiftofthecarrierphasetocomputeA.latitudeB.longitudeC.speedD.time【知識點】GPS【解析】多數(shù)GPS接收機使用載波相位的多普勒頻移技術(shù)來計算速度。C569.WhichstatementconcerningGPSisTRUE?Itcannotbeusedinallpartsoftheworld.B.Thereare12functioningGPSsatellitesatpresent.D.Twopositionlinesareusedtogivea2Dfix.B.DecreasepositioningaccuracyD.Idon’tknowD.Twopositionlinesareusedtogivea2Dfix.B.DecreasepositioningaccuracyD.Idon’tknow【知識點】GPS的使用【解析】GPS可以隨時中止提供服務(wù)。A497.WhatisthemainpurposeofDGPS?A.ImprovepositioningaccuracyC.Reduceoperationalcost【知識點】DGPS【解析】DGPS的主要作用是提高定位精度。相同題目B620、Atechniquereferredtoas allowsuserstoobtainmaximumaccuracyfromtheGPSsystem.A.AISB.DGPSC.ARPAD.RBSKeyword12:AISandVDR（13）A503、automaticallyprovidestheship'snauticalofficerswithimportantinformationaboutnearbyvesselsorotherrelevantobjectswithinVHFrang.A.AISB.ECDISC.GPS D.VDR【知識點】AIS的作用【解析】AIS自動地提供給船舶駕駛員在VHF有效距離內(nèi)的船舶或其他目標的重要信息。、相同題目A520.TheAIStransponderisdesignedtotransmitinformation.A.automaticallyB.semi-automaticallyC.manuallyD.AISisnottransmittingatallA504.The transmitsownshipdatacyclicallyviatwodefinedVHFchannelsandreceivesthesamedataoftheothershipsandobjectsthatareequippedwithAISsystems.A.AIS B.ECDIS C.GPSD.VDR【知識點】AIS的作用【解析】AIS通過兩個預(yù)設(shè)的VHF頻道循環(huán)地發(fā)送本船信息，并且接收裝有AIS的其他船舶和目標的同樣的信息。A516.WhatisimportanttorememberwhenusingAISforcollisionavoidance?A.AISmaynotgiveacompletepictureofthetrafficsituationAISismoreaccuratethanARPAAISisnotasaccurateasARPAAISisnotallowedtobeusedforcollisionavoidance【知識點】AIS的使用【解析】AIS用于避碰時需要記住：AIS不能以畫面的方式顯示附近交通情況。C518.IncaseofAISoverload,whatcanyouexpect?A.AISwillshutdown B.AISwill“freeze”C.Targetsfarawaydropout D.Closetargetsdropout【知識點】AIS的容量【解析】如果AIS信息容量過載，則自動過濾遠距離目標。相關(guān)題目C521.HowmuchcantheAISbroadcastmodebeoverloadedwithoutanysignificantoperationaleffect?A.50%~100% B.200%~300% C.400%~500%D.nooverloadisacceptedC519.Whichofthefollowingisdefinedasstaticinformation?A.NavigationalstatusB.safetyrelatedmessagesC.MMSID.Routeplan【知識點】AIS靜態(tài)信息【解析】靜態(tài)信息包括：IMO編號，船名與呼號，船長與寬度，船型，定位天線在船上的位置。MMSI：MaritimeMobileServiceIdentity海事移動業(yè)務(wù)識別碼A564.Automaticidentificationsystem(AIS)areexpectedtobroadcastallofthefollowinginformationexcept.A.portoforigin B.nameofvesselC.courseandspeedovergroundD.draftofvessel【知識點】AIS提供的信息【解析】不能提供始發(fā)港。相同題目C565.Automaticidentificationsystems(AIS)areexpectedtobroadcastallofthefollowinginformation|EXCEPT.A:navigationstatusB:ship'sheadingC: