三副航海英语习题讲解Word格式.docx
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三副航海英语习题讲解Word格式.docx
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D.theuseofradarisnecessaryonlywhenvisibilityisrestricted、
D527.Radarisnotonlytoobtain______,butalsotomeasuretheirdistanceawayfromyou.
A.brightnessofobjectsB.coloroftargets
C.shapeoftargetsD.bearingofobjects
D361.WhichstatementconcerningtheoperationofradarinfogisTURE?
A.radarrangesarelessaccurateinfog
B.navigationbuoyswillalwaysshowuponradar
C.asandybeachwillshowupcleareronradarthanarockycliff
D.smallwoodenboatsmaynotshowuponradar
B327.Thecorrectmethodofswitchingoffamarineradaristoturnpowerswitchto____positionfirst,thento______position.
A.off/standbyB.standby/offC.standby/closeD.close/standby
【解析】雷达关机步骤。
B606、Astheradarantennascansthrough____arotation,itcanbeshowwherethetargetisrelativetoyourposition.
A.60degreeB.360degreeC.180degreeD.90degree
【解析】雷达天线。
A345.Theradarcontrolthatreducesweakechoesouttoalimiteddistancefromtheshipisthe__
A.sensitivitytimecontrol(sea-cluttercontrol)B.receivergaincontrol
C.brilliancecontrolD.fasttimeconstant(differentiator)
【知识点】雷达的使用(控钮)
【解析】近距离的杂波
D346.Theradarcontrolthatshortensallechoesonthedisplayandreducescluttercausedbyrainorsnowisthe______.
A.sensitivitytimecontrol(seacluttercontrol)B.receivergaincontrol
C.brilliancecontrolD.fasttimeconstant(differentiator)
D372.______isonthepanelofradar.
INVERTER
A391.WhatisthepurposeofVRMcontrol?
A.TomeasuredistanceaccuratelyB.Tomeasurebearingaccurately
C.TomeasurerangeandbearingD.Toadjustradarmonitor
【解析】活动距标圈。
D557.SWEEPINTonradarpanelistheabbreviationof______.
A.sweepintroductionB.sweepinterestC.sweepintentionD.sweepintensity
【解析】扫描亮度
A605、Whenwillyouhavetoadjustgain?
A.everytimeyouchangerangesB.eachwatchC.everydayD.everyweek
【解析】增益:
每次改变量程后需重新调整。
D352.Whenhittingasolidobjectsuchasashiporanairplane,theradarwavesarereflectedback______theycame.
A.inthewayB.thewayC.bythewayD.throughthepath
【知识点】雷达的工作原理
【解析】雷达波路径
B360.WhichgeneralstatementconcerningradarisFALSE?
A.raisingtheantennaheightincreasestheradarrange
B.theabilityofradartodetectobjectsisunaffectedbyweatherconditions
C.radarbearingarelessaccuratethanradarrange
D.radarshouldbecheckedregularlyduringclearweathertoensurethatitisoperatingproperly
【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.afewmetersD.afewfeet
【知识点】雷达技术指标(波长)
【解析】航海雷达主要是3cm和10cm
C336.The10-cmradarascomparedtoa3-cmradarofsimilarspecificationswill______.
A.bemoresuitableforriverandharbornavigation
B.providebetterrangeperformanceonlowlyingtargetsduringgoodweatherandcalmseas
C.haveawiderhorizontalbeamwidth
D.havemoreseareturnduringroughseaconditions
【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——3cm好。
3)方位分辨力和测方位精度:
波长越短,波束宽度越窄——3cm好。
4)抗杂波能力:
10cm好。
D337.The3-cmradarascomparedtoa10-cmradarwithsimilarspecificationswill______.
A.givebetterrangeperformanceinrain,hail,etc.
B.displaysmalltargetsinamassofdenseseaclutteratagreaterrange
C.havelessseareturninchoppyroughseas
D.displayamoremaplikepresentationforinshorenavigation
A364.Coralatolls,orachainofislandsatrightanglestotheradarbeam,mayshowasalonglineratherthanasindividualtargetsdueto______.
A.theeffectsofbeamwidthB.limitationsonrangeresolution
C.thepulselengthoftheradarD.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.
A.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.Thecontactisdeadinthewater
B.Thecontactisonthesamecourseandspeedasyourvessel
C.Thecontactisonareciprocalcourseatthesamespeedasyourvessel
D.Theradarisshowingfalseechoesandisprobablydefective
【解析】相对运动
C374.Aradarcontactwillremainstationaryonarelativemotionradardisplayonlywhenitis____.
A.onthesamecourseasyourvessel
B.atthesamespeedasyourvessel
C.onthesamecourseandspeedasyourvessel
D.onareciprocalcourseatthesamespeedasyourvessel
D363.Youareunderwayat5knotsandseeonyourradaracontact10milesdirectlyasternofyou.12minuteslatter,thecontactis8milesdirectlyasternofyou.Whatistheestimatedspeedofthecontact?
A.deadinthewaterB.1knotC.10knotsD.15knots
【解析】相对运动:
d=(V2-V1)t
C353.Whenusingaradarinaunstabilizedmode,fixesaredeterminedmosteasilyfrom______.
A.centerbearingsB.tangentbearingsC.rangesD.objectsthatarecloseaboard
【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
【解析】北向上——稳定显示方式。
C376.Aradardisplaywhichisoriented,(标定方向)sothatnorthisalwaysatthetopofthescreen,iscalleda(n)__
A.relativedisplayB.compositedisplayC.stabilizeddisplayD.unstabilizeddisplay
C392.Whatcourseshouldbefedintoastabilizedradarpicture?
A.CompasscourseB.GyrocourseC.TruecourseD.Coursemadegood
【解析】稳定显示方式:
使用航向为真航向。
A529.Yourradarissetonatruemotiondisplay.WhichofthefollowingwillNOTappeartomoveacrossthePPIscope?
A.Echoesfromabuoy
B.Ownship'
smarker
C.Echofromashiponthesamecourseatthesamespeed
D.Echofromashiponareciprocalcourseatthesamespeed
【知识点】真运动
【解析】真运动模式
A339.Whenthesystemdeterminesthatacollisionsituationexists,thetargetcausingthealarmconditionareidentifiedon{PPI}byabrightTadjacentthereto.
A.planpositionindicatorB.planepositionindicator
C.policyproofofinterestD.policyproofofinterest
【知识点】雷达显示
【解析】平面位置显示器
B377.Aradarrangetoasmall,chartedobjectsuchasalightwillprovidealineofpositioninwhichform?
A.StraightlineB.ArcC.ParabolaD.Hyperbola
【知识点】雷达测距
【解析】距离位置线
C330.Anavigatorfixingavessel’spositionbyradar______.
A.shouldneveruseradarbearings
B.shouldonlyuseradarbearingswhentherangeexceedsthedistancetothehorizon
C.canuseradarinformationfromoneobjecttofixtheposition
D.mustuseinformationfromtargetsforwardofbeam
【知识点】雷达定位
【解析】雷达定位方法。
B342.Thecommonwaytoobtainyourship’spositionis______.
A.keepingaclosewatchandlookoutB.takingaradarrangeandbearing
C.observingaradartargetandlisteningtosignalsD.keepingawellclearcaution
C356.Whenusingtheradarfornavigating____.
A.Thebestfixisobtainedbyusingatangentbearingandarange.
B.Andusingtworadarrangesforafix,theobjectsoftherangesshouldbeclosedtoreciprocalbearings.
C.Andusingranges,themostrapidlychangingrangeshouldbemeasuredlast.
D.Andcrossingaradarrangeofoneobjectwiththevisualbearingofasecondobject,thetwoobjectsshouldbe80°
to110°
apart.
【解析】测距定位时,距离变化快的后测。
A341.Inradarplottingistheabbreviationof______.
A.closestpointtoapproachB.closepointtoapproach
C.crossingpointtoapproachD.fogorsteadyrain
【知识点】雷达标绘
【解析】CPA
C340.Theclosestpointofapproach(CPA)ofacontactonarelativemotionradarmaybedetermined____.
A.immediatelywhenthecontactisnotedonradar
B.onlyiftheradarscopeiswatchedconstantly
C.afterthecontacthasbeenmarkedatleasttwice
D.byanoccasionalglanceattheradar
【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。
A394.Howdoescurrentanddrifteffecttherelativemotion,relativevectorpresentation?
A.NoeffectB.Producingsmallerrorsincalculatedaspect
C.ProducinglargeerrorsincalculatedaspectD.ProduceerrorsincalculatedCPA/TCPA
B395.DoescurrentanddrifteffecttheCPA/TCPAcalculationsonatruemotiondisplay?
A.YesB.NoC.OnlyalittlebitD.Yes,veryseriously
B381.Anindirectradarechoiscausedbyareflectionofthemainlobeoftheradarbeamofftheobserver’svessel.Whichofthefollowingisnotacharacteristicofindirectechoes?
A.Theirbearingisalmostconstant,evenwhenthetruebearingofthecontactchangesappreciably
B.Theyalwaysappearonabearingo
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