VHF通信A卷及参考答案10春本科.doc

2010春航海技术本科船舶信号与VHFA卷姓名： 成绩： 一、单项选择题（每题2分共70分）1. IMO has decided thatallships over 300TGtmustbe fittedwith a NAVTEX receiver _. A.by01 Feb 1992 B.by01Aug 1993 C.between 01Feb 1992and01 Feb 1999 D.before 01 Feb 1992 2. GMDSS istoprovide _ with reliablecommunication. A.alllarge passenger vessels B.freighters of more than300gtincoastal waters C.allpassenger ships and cargoships engaged ininternational-voyages D.allpassenger ships andcargoships of 300gtupwards inopensea 3. The complyingvessels cantransmit ship-to-shore distress alertsbyatleast_. A.One means,whether satellite or terrestrial techniques B.Twomeans,whether satellite orterrestrialtechniques C. Two separate and independent means, each using different radio communication services D.Twomeans,such asMFDSCandHFDSC 4. The quality of the message canbe affected by_. A.climate B.sunshine C.humanbeings D.both a andb 5. Withinthe polar areasitis_tosee a satellite ingeo-stationary orbit. A.impossible B.possible C.easy D.difficult 6. The Inmarsatsystem is openforuse by_countries onanon-discriminatory basis. A.some B.lots of C.many D.all 7. Withthe help of GMDSS _canbe alertedtoadistress incidentassoonaspossible . A.allships inalarge sea area B.only the sea authorities ashore C.the SAR units ashore andatsea D.the portradios andthe coaststations 8. Inareascovered byInmarsatHFcanbe used asan_tosatellite communications. A.alternation B.alternate C.alter D.alternative 9. Whenreceivinga distress alert,the SAR authorities ashore andthe ships inthe vicinity of the ship in distress will _ in a coordinated search and rescue operation with the minimum delay . A.assist B.send a rescue vessel C.searchthe distress area D.reachthe distress position atonce 10. Inwhich year wasthe COSPAS-SARSATsystem established ? A.1980 B.1981 C.1979 D.1982 11. Itis quite _ foranSES operator tosend a distress alert. A.easyandexpensive B.simple andcertain C.dangerous and stable D.difficultand compulsory 12. Any ships fitted with SES can _ and _ through the satellite system when sendinga distress alert. A.enter the system / contactanRCC B.access toINMARSAT/ establishcontactwith aCES C.have absolute priority toenter the system / make contactwitha CES D.enter the system gradually / waitfor rescue 13. Whatsthe advantage whenusing the satellites ? A.The message canbedirected tothe desired location B.The message canfollow the earthscurvature C.The qualityof message cannot beaffected byclimatic D.The range of the message extend andthe qualityof reception isimproved 14. The DSCfrequency fordistress alertinginAreaA2is _. A.2182KHZ B.2174.5KHZ C.2192KHZ D.2187.5KHZ 15. Whatchannel is general communicationused ? A.anyappropriate channel except public communication B.any appropriate channel except forpublic communications C.any appropriate channel besides public communication D.anyappropriate channel beside public communication 16. why dosome stations keep silence ? A.Because they arenot engaged inthe distress traffic B.they will affectthe transmission of the distress traffic C.The powers of these stations arevery weak D.They arenotincharge of searchandrescue 17. General radiocommunications inthe global system arethose between _concerning the managementandoperation of the ships and may have impactontheir safety. A.SAR partyand the ship indistress B.SAR authorities and the ship indistress and survival craft C.Aship stationand anycoaststation D.Ship stations andshore-based communicationnetwork 18. Itis requiredthatships proceedingatsea should keep continuous watch on_. A. VHF channels 16 and 13 B. Appropriate DSC distress and safety frequencies C.INMARSATTDM message channel D.VHF channel 70and channel 8 19.TheARQmode should beapplied _ . A.whentwostations communicate with eachother B.inanyradiosystem andatanytime C.when one ship sends amessage toanother station D.forcommunicationamongsome stations 20.Whatinformationwill adistress alertcontain? A.nature of distress B.type of assistance required C.course and speed and time atwhich the information wasrecorded D.A,B,Careallright 21.Aradiodetermination system based on the comparisonof reference signals with radiosignals reflected ,or retransmitted from the position tobe determined, is_ . A.DF B.RadarSystem C.DSCSystem D.COSPAS-SARSAT 22. With the help of modern technology, ships are able to receive automated broadcast of safety messages _. A.bydayor atnight B.almost round the clock C.somewhatandsometime D.from sunrise andsunset 23. The WWNWS is a coordinated global service for the broadcast by radioof vital information on_tomarine navigation. A.shipsmovement B.safety C.shipsmanagement D.hazards 24.distress alertswill berelayed onthe _whenthe RCCconsiders itnecessary . A.dedicated system B.MSIbroadcasts C.518KHZ D.channel 16 25.The frequency 518KHZ will be used totransmit _and_wanings inNAVTEX . A.navigational / typhoon B.traffic/ meteorological C.marine / hurricane D.navigational / meteorological 26.Itis possible forships toreceive safetymessage transmitted byNavtex station_. A.inanyINMARSATregions B.ineachNAVTEX area C.atany distance D.inAreasA3andA4 27.ANavtex stationineachNAVAREAis usually allowed tohave _for transmission. A.10minutes every 4 hours B.half anhour every other hour C.irregular period of time D.5 minutes every twohours 28.The difference betweeninternational andnational Navtex Service islimited to_. A.frequency allocated B.both language andfrequency C.language used D.transmission power andtime 29.Navtex transmitter identificationcharacter_isused toidentifythe broadcasts which are tobeaccepted bythe receiver andthose aretoberejected . A.B2 B.B1 C.MAR D.NNN 30.The receiving stations canuse the B2character to_different, classesof messages . A.identify B.Correct C.Reject D.Printout 31. If EGC receiver shares a same antenna with Inmarsat SES, it means that it can receive MSI _ . A.from anyInmarsatsatellite B.from anyappropriate Navtex andEGCstation C.via the satellite the SES istracking D.from anyRCCandcoaststation 32. Why should the SES operators be very careful when the ship enters the area where three oceanregions overlap ? Because _. A. the weather isalways terrible B.the conditionthere iscomplicated C.the signals aretoostrong D.their SES may receive the signals from unwanted satellite 33. The establishment of INMARSAT as an independent organization marked a great step forward for maritime radio communications . What does “marked a great step” mean in the sentence ? A.Torunfasterthanever B.Togoforward C.Tomarch withoutstopping D.Asignificantsymbol of a greatimprovementinmaritime communication. 34. In addition to meeting the requirement of Sea area A1, every ship engaged on voyage in Sea areaA2shall beprovided with _. A.MFradioinstallationwith DSC B.SES C.MF/HFradiotelephone installation D.2187.5KHZwatch receiver 35._is aspace system usingone or more artificial earthsatellites . A.satellite network B.