第三节 磁罗经与陀螺罗经的使用.docx
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第三节 磁罗经与陀螺罗经的使用.docx
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第三节磁罗经与陀螺罗经的使用
磁罗经与陀螺罗经的使用
1、Ashipunderconstructionormajorrepairwillacquirepermanentmagnetismdueto______whilesittingstationaryintheearth'smagneticfield.a
A.hammeringandjarring
B.vibrationandpounding
C.varyingmagneticfields
D.stableorpermanentmagnetismoftheship
2、Avesselisheadingmagneticeastanditsmagneticcompassindicatesaheadingof086°.Whichactionshouldbetakentoremovethiserrorduringcompassadjustment________.a
A.Iftheblueendsofthemagnetsareaft,andthefore-and-afttrayisatthetop,youshouldaddsomemagnets
B.Iftheblueendsofthemagnetsareaftyoushouldlowerthefore-and-afttray
C.Iftheblueendsofthemagnetsareaft,andthefore-and-afttrayisatthetop,youshouldreversethemagnets
D.Iftheblueendsofthemagnetsareforward,andthefore-and-afttrayisatthebottom,youshouldaddsomemagnets
3、Avesselisheadingmagneticnorthwestanditsmagneticcompassindicatesaheadingof312°.Whatactionshouldbetakentoremovethiserrorduringcompassadjustment________.a
A.Ifthequadrantalspheresareallthewayout,replacethemwithsmallerspheres
B.Ifthequadrantalspheresareallthewayin,replacethemwithlargerspheres
C.Ifthequadrantalspheresareallofthewayout,movethespheresin
D.Ifthequadrantalspheresareallthewayout,replacethemwithlargerspheres
4、Anypieceofmetalonbecomingmagnetizedwilldevelopregionsofconcentratedmagnetismcalled______.b
A.flux
B.poles
C.magnets
D.azimuth
5、Byconvention,thenorthseekingendsofacompass'magnetsarecolored______.c
A.Black
B.Blue
C.Red
D.White
6、Ifashipisproceedingtowardsthemagneticequator,theuncorrecteddeviationduetopermanentmagnetism______.c
A.Increases
B.Remainsthesame
C.Decreases
D.Isunimportantandmaybeneglected
7、Inmorerecentyears,______hasbeenusedbyciviliansinmanynewwaystodeterminepositions,suchasinautomobileandboatnavigation,hiking,emergencyrescue,andprecisionagricultureandmining.a
A.GPS
B.GMDSS
C.AIS
D.Navtex
8、Indicationsofthemastergyrocompassaresenttoremoterepeatersbythe______.b
A.Follow-upsystem
B.Transmitter
C.Phantomelement
D.Azimuthmotor
9、Linesonachartwhichconnectpointsofequalmagneticvariationarecalled______.d
A.Magneticlatitudes
B.Magneticdeclinations
C.Dip
D.Isogoniclines
10、Magneticvariationchangeswithachangein______.d
A.thevessel'sheading
B.seaconditions
C.seasons
D.thevessel'sposition
11、Theagoniclineonanisomagneticchartindicatesthe______.c
A.Magneticequator
B.Magneticlongitudereferenceline
C.Pointswherethereisnovariation
D.Pointswherethereisnoannualchangeinvariation
12、Theangulardifferencebetweenthetruemeridian(greatcircleconnectingthegeographicpoles)andthemagneticmeridian(directionofthelinesofmagneticflux)iscalled______.b
A.deviation
B.variation
C.error
D.difference
13、Thecompasserrorofamagneticcompassthathasnodeviationis______.b
A.Zero
B.Equaltovariation
C.Eliminatedbyadjustingthecompass
D.Constantatanygeographicallocation
14、Thedifferencebetweenmagneticheadingandcompassheadingiscalled______.b
A.VariationB.Deviation
C.CompasserrorD.Drift
15、Theerrorinamagneticcompasscausedbythevessel'smagnetismiscalled______.b
A.Variation
B.Deviation
C.Compasserror
D.Bearingerror
16、TheFlindersbarandthequadrantalspheresshouldbetestedforpermanentmagnetismatwhatinterval________.c
A.Theyarenotsubjecttopermanentmagnetism;nocheckisnecessary
B.Semiannually
C.Annually
D.Everyfiveyears
17、TheFlindersbaronamagneticcompasscompensatesforthe______.a
A.Inducedmagnetisminverticalsoftiron
B.Inducedmagnetisminhorizontalsoftiron
C.Permanentmagnetisminship'ssteel
D.Vessel'sinclinationfromthevertical
18、Thegyrocompasserrorresultingfromyourvessel'smovementinOTHERthananeast-westdirectioniscalled______.d
A.Dampingerror
B.Ballisticdeflection
C.Quadrantalerror
D.Speederror
19、Thelinewhichconnectsthepointsofzeromagneticdipis______.b
A.Anagonicline
B.Themagneticequator
C.Amagneticmeridian
D.Alloftheabove
20、ThemagneticcompassmagnetsareactedonbythehorizontalcomponentoftheEarth'stotalmagneticforce.ThismagneticforceisGREATESTatthe______.d
A.northmagneticpole
B.southmagneticpole
C.magneticprimeverticalmeridian
D.magneticequator
21、Themagnetisminthevariousstructuresofashipchangingasaresultofcruising,vibration,oragingistermed______.b
A.permanentmagnetism
B.subpermanentmagnetism
C.inducedmagnetism
D.variablemagnetism
22、Themostaccuratemethodofdetermininggyrocompasserrorwhileunderwayisby______.a
A.Comparingthegyroazimuthofacelestialbodywiththecomputedazimuthofthebody
B.Comparingthegyroheadingwiththemagneticcompassheading
C.Determiningfromthechartthecoursemadegoodbetweencelestialfixes
D.Itcannotbedeterminedaccuratelyatseaduetodriftofunknown
currents.
23、TheMOSTimportantfeatureofthematerialusedformakingthebinnacleofastandardmagneticcompassisthatitis______.a
A.nonmagnetic
B.weatherproof
C.corrosionresistant
D.capableofbeingpermanentlyaffixedtothevessel
24、Thepermanentmagnetismofavesselmaychangeinpolaritydueto______.b
A.Beingmooredforalongtimeononeheading
B.Beingstruckbylighting
C.Steamingfromthenorthmagnetichemispheretothesouthmagnetichemisphere
D.Loadingahomogenousmagneticcargosuchassteelplate,ironbars,etc.
25、Theprincipalpurposeofadjustmentofthemagneticcompassistoeliminate______asfaraspossible.c
A.Variation
B.Compasserror
C.Deviation
D.Earth'smagneticforce
26、Thequadrantalspheresareusedto______.a
A.Removedeviationontheintercardinalheadings
B.Removedeviationonthecardinalcompassheadings
C.Removeheelingerror
D.Compensateforinducedmagnetisminverticalsoftiron
27、Thetotalmagneticeffectswhichcausedeviationofavessel'scompasscanbebrokendownintoaseriesofcomponentswhicharereferredtoas______.b
A.divisionalparts
B.coefficients
C.fractionalparts
D.equations
28、Thevariationformostgivenareasundergoes______change,theamountofwhichisalsonotedoncharts.a
A.anannual
B.aconstant
C.avariable
D.anunstable
29、Thisinducedmagnetism______thepermanentmagnetismalreadypresentintheship.c
A.willaddto
B.willsubtractfrom
C.mayaddtoorsubtractfrom
D.willnotchange
30、Variationinacompassiscausedby______.b
A.Worngearsinthecompasshousing
B.Magnetismfromtheearth'smagneticfield
C.Magnetismwithinthevessel
D.Lackofoilinthecompassbearings
31、Whataretheonlymagneticcompasscorrectorsthatcorrectforbothpermanentandinducedeffectsofmagnetism________.b
A.Quadrantalspheres
B.Heelingmagnets
C.Athwartshipsmagnets
D.Fore-and-aftmagnets
32、Whatisanadvantageofthemagneticcompassaboardvessels________.c
A.Compasserrorisnegligibleatorneartheearth'smagneticpoles
B.Itdoesnothavetobecheckedasoften
C.Itisreliableduetoit'sessentialsimplicity
D.Allpointsonthecompassrosearereadilyvisible
33、Whatisthebasicprincipleofthemagneticcompass________.a
A.Magneticmaterialsofthesamepolarityrepeleachotherandthoseofoppositepolarityattract
B.TheEarth'smagneticlinesofforceareparalleltothesurfaceoftheEarth.
C.Magneticmeridiansconnectpointsofequalmagneticvariation
D.Thecompassneedle(s)will,whenproperlycompensated,lieparalleltotheisogoniclinesoftheEarth
34、Whatisusedtocorrectforbothinducedandpermanentmagnetism,andconsequentlymustbereadjustedwithradicalchangesinlatitude________.d
A.Flindersbar
B.Softironspheres
C.Fore-and-aftpermanentmagnetsintheirtrays
D.Heelingmagnet
35、Whenamagneticcompassisnotinuseforaprolongedperiodoftimeitshould______.a
A.Beshieldedfromdirectsunlight
B.Belockedintoaconstantheading
C.Haveanyairbubblesreplacedwithnitrogen
D.Havethecompensatingmagnetsremoved
36、Whenavesselchangescoursefromonecardinalheadingtoanothercardinalheadingwhileadjustingthecompass,whichactionshouldbetaken________.b
A.Thecoursechangeshouldbemaderapidlytopreventtransientinducedmagnetismwhilepassingtheintercardinalheadings
B.Afterthenewheadingisreached,thevesselshouldsteamonthatcourseforatleasttwominutesbeforetheadjustment
C.Duringthecoursechange,youshouldgentlytapthecompasstoremoveanyerrorcausedbyfrictiononthepivotbearing
D.Aftersteadyingonthenewheading,thecompasscardshouldbeslewedbyamagnetandallowedtooscillatefreelytoremoveanygaussinerror
37、Whencrossingthemagneticequatorthe______.b
A.Flindersbarshouldbeinverted
B.Heelingmagnetshouldbeinverted
C.Thequadrantalspheresshouldberotated180°
D.Flindersbarshouldbemovedtotheoppositesideofthebinnacle
38、Whenrelievingthehelm,thenewhelmsmanshouldknowthe______.a
A.Coursepermagneticsteeringcompass
B.Gyroerror
C.Variation
D.Maximumrudderanglepreviouslyused
39、Whichcompensatesforerrorsintroducedwhenthevesselheelsover________.c
A.Thesoftironspheresonthearmsofthebinnacle
B.Magnetsplacedintraysinsidethebinnacle
C.Asingleverticalmagnetbeneaththecompass
D.TheFlindersbar
40、Whichmagneticcompasscorrector(s)canbesetwhilethevesselisonaheadingofmagneticnorthormagneticsouth________.b
A.Quadrantalspheres
B.Heelingmagnets
C.Flindersbar
D.Fore-and-aftmagnets
41、Whichmagneticcompasscorrector(s)CANNOTbesetonaheadingofmagneticeastorm
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