三副航海英语习题讲解.docx

三副航海英语习题讲解.docx

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三副航海英语习题讲解

2017航海英语复习三

Keyword10:

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__.

A.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.Itsrangereadingismoreaccuratethanitsbearingreading

B.Alow-lyingcoastlinewithalong,flatbeachwillshowupproperlyontheradar.

C.Radarisonlyaimedatcollisionavoidance.

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

【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.receivergaincontrol

C.brilliancecontrolD.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.receivergaincontrol

C.brilliancecontrolD.fasttimeconstant（differentiator）

D372.______isonthepanelofradar.

INVERTER

A391.WhatisthepurposeofVRMcontrol?

A.TomeasuredistanceaccuratelyB.Tomeasurebearingaccurately

C.TomeasurerangeandbearingD.Toadjustradarmonitor

【知识点】雷达的使用

【解析】活动距标圈。

D557.SWEEPINTonradarpanelistheabbreviationof______．

A．sweepintroductionB．sweepinterestC．sweepintentionD．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______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

【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．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

【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——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。

相关题目

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

【知识点】雷达显示方式

【解析】相对运动

相关题目

C374.Aradarcontactwillremainstationaryonarelativemotionradardisplayonlywhenitis____.

A.onthesamecourseasyourvessel 

B.atthesamespeedasyourvessel

C.onthesamecourseandspeedasyourvessel

D.onareciprocalcourseatthesamespeedasyourvessel

D363.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）t

C353.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.unstabilizeddisplay

C392.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?

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

相关题目

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。

相关题目

B342.Thecommonwaytoobtainyourship’spositionis______.

A.keepingaclosewatchandlookoutB.takingaradarrangeandbearing

C.observingaradartargetandlisteningtosignalsD.keepingawellclearcaution

C356.Whenusingtheradarfornavigating____.

A.Thebestfixisobtainedbyusingatangentbearingandarange.

B.Andusingtworadarrangesforafix,theobjectsoftherangesshouldbeclosedtoreciprocalbearings.

C.Andusingranges,themostrapidlychangingrangeshouldbemeasuredlast.

D.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.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

【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.NoeffectB.Producingsmallerrorsincalculatedaspect

C.ProducinglargeerrorsincalculatedaspectD.ProduceerrorsincalculatedCPA/TCPA

B395.DoescurrentanddrifteffecttheCPA/TCPAcalculationsonatruemotiondisplay?

A.YesB.NoC.OnlyalittlebitD.Yes,veryseriously

B381.Anindirectradarechoiscausedbyareflectionofthemainlobeoftheradarbeamofftheobserver’svessel.Whichofthefollowingisnotacharacteristicofindirectechoes?

A.Theirbearingisalmostconstant,evenwhenthetruebearingofthecontactchangesappreciably

B.Theyalwaysappearonabearingo