Permanent magnetism is found in ______.A.hard ironB.soft ironC.vertical iron onlyD.horizontal iron only
Permanent magnetism is found in ______.
A.hard iron
B.soft iron
C.vertical iron only
D.horizontal iron only
相关考题：
Permanent magnetism is caused by ______.A.operation of electrical equipment and generators on board shipB.the earth's magnetic field affecting the ship's hard iron during constructionC.the horizontal component of the earth's magnetic field acting on the horizontal soft ironD.the vertical component of the earth's magnetic field acting on the vertical soft iron
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
The magnetism in the various structures of a ship changing as a result of cruising，vibration，or aging is termed ______．A.permanent magnetismB.subpermanent magnetismC.induced magnetismD.variable magnetism
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
A single vertical magnet placed underneath the compass in the binnacle is used to compensate for ______．A.The horizontal component of the permanent magnetismB.Deviation caused by the vessel's inclination from the verticalC.Induced magnetism in the horizontal soft ironD.Induced magnetism in the vertical soft iron
Before a magnetic compass is adjusted certain correctors must be checked to ensure that they are free of permanent magnetism．These correctors are the ______．A.Fore-and-aft and athwartships magnetsB.Dip needle and heeling magnetC.Heeling magnet and Flinders barD.Flinders bar and quadrantal spheres
Magnetism which is present only when the material is under the influence of an external field is called ______.A.permanent magnetismB.induced magnetismC.residual magnetismD.terrestrial magnetism
Which of the following is not true of British iron and steel industry?（）A、Britain.s steel industry is declining.B、No more new discoveries of iron ore have been found in Britain.C、Supplies of iron ore are now mostly foreign.D、Compared with newer plants in the world,Britain.s steelworks are not efficient.
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
单选题What is used to correct for both induced and permanent magnetism，and consequently must be readjusted with radical changes in latitude（）.AFlinders barBSoft iron spheresCFore-and-aft permanent magnets in their traysDHeeling magnet
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The permanent magnetism of a vessel may change in polarity due to（）.Abeing moored for a long time on one headingBbeing struck by lightingCsteaming from the north magnetic hemisphere to the south magnetic hemisphereDloading a homogenous magnetic cargo such as steel plate，iron bars，etc
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
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
单选题Before a magnetic compass is adjusted certain correctors must be checked to ensure that they are free of permanent magnetism. These correctors are the（）.Afore-and-aft and athwartships magnetsBdip needle and heeling magnetCheeling magnet and Flinders barDFlinders bar and quadrantal spheres
单选题The quadrantal spheres are used to（）.ARemove deviation on the intercardinal headingsBRemove deviation on the cardinal compass headingsCRemove heeling errorDCompensate for induced magnetism in vertical soft iron
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
单选题The permanent magnetism of a vessel may change in strength due to（）.Athe nature of the cargo being carriedBchanges in headingCmajor structural repairDAll of the above
单选题Permanent magnetism is caused by（）.Aoperation of electrical equipment and generators on board shipBthe earth's magnetic field affecting the ship's hard iron during constructionCthe horizontal component of the earth's magnetic field acting on the horizontal soft ironDthe vertical component of the earth's magnetic field acting on the vertical soft iron
单选题Permanent magnetism is found in（）.Ahard ironBsoft ironCvertical iron onlyDhorizontal iron only
单选题A ship under construction or major repair will acquire permanent magnetism due to（）while sitting stationary in the earth’s magnetic field.Ahammering and jarringBvibration and poundingCvarying magnetic fieldsDstable or permanent magnetism of the ship
单选题Induced magnetism is found in（）.Ahard ironBsoft ironCvertical iron onlyDhorizontal iron only
单选题A single vertical magnet placed underneath the compass in the binnacle is used to compensate for（）.Athe horizontal component of the permanent magnetismBdeviation caused by the vessel's inclination from the verticalCinduced magnetism in the horizontal soft ironDinduced magnetism in the vertical soft iron
单选题At the magnetic equator there is no induced magnetism in the vertical soft iron because（）.Athe lines of force cross the equator on a 0°-180°alignmentBthe quadrantal error is 0°Cthere is no vertical component of the Earth's magnetic fieldDthe intercardinal headings have less than 1°