单选题This induced magnetism()the permanent magnetism already present in the ship.Awill add toBwill subtract fromCmay add to or subtract fromDwill not change

单选题
This induced magnetism()the permanent magnetism already present in the ship.
A

will add to

B

will subtract from

C

may add to or subtract from

D

will not change


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The permanent magnetism of a vessel may change in strength due to ______.A.the nature of the cargo being carriedB.changes in headingC.major structural repairD.All of the above

A ship under construction or major repair will acquire permanent magnetism due to ______ while sitting stationary in the earth's magnetic field.A.hammering and jarringB.vibration and poundingC.varying magnetic fieldsD.stable or permanent magnetism of the ship

What is used to correct for both induced and permanent magnetism,and consequently must be readjusted with radical changes in latitude ________.A.Flinders barB.Soft iron spheresC.Fore-and-aft permanent magnets in their traysD.Heeling magnet

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The Flinders bar and the quadrantal spheres should be tested for permanent magnetism at what interval ________.A.They are not subject to permanent magnetism; no check is necessaryB.SemiannuallyC.AnnuallyD.Every five years

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单选题If a ship is proceeding towards the magnetic equator,the uncorrected deviation due to permanent magnetism().AincreasesBremains the sameCdecreasesDis unimportant and may be neglected

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单选题The vertical component of the Earth’s magnetic field causes induced magnetism in vertical soft iron. This changes with latitude. What corrects for this coefficient of the deviation? ()AThe Flinders barBThe heeling magnetCQuadrantal soft iron spheresDBar magnets in the binnacle

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单选题The permanent magnetism of a vessel may change in strength due to().Aa collision with another vesselBbeing moored on a constant heading for a long period of timeCbeing struck by lightningDAll of the above

单选题What are the only magnetic compass correctors that correct for both permanent and induced effects of magnetism?()AQuadrantal spheresBHeeling magnetsCAthwartships magnetsDFore-and-aft magnets

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单选题The Flinders bar and the quadrantal spheres should be tested for permanent magnetism at what interval().AThey are not subject to permanent magnetism; no check is necessaryBSemiannuallyCAnnuallyDEvery five years

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