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单选题
Permanent magnetism is caused by（）.
A
operation of electrical equipment and generators on board ship
B
the earth's magnetic field affecting the ship's hard iron during construction
C
the horizontal component of the earth's magnetic field acting on the horizontal soft iron
D
the vertical component of the earth's magnetic field acting on the vertical soft iron
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更多 “单选题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” 相关考题
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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
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Permanent magnetism is found in ______.A.hard ironB.soft ironC.vertical iron onlyD.horizontal iron only
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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
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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
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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 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
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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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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
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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
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Compass deviation is caused by ______.A.magnetism from the earth’s magnetic fieldB.misalignment of the compassC.magnetism within the vesselD.a dirty compass housing
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单选题If a ship is proceeding towards the magnetic equator，the uncorrected deviation due to permanent magnetism（）.A
increasesB
remains the sameC
decreasesD
is unimportant and may be neglected
考题
单选题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
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单选题This induced magnetism（）the permanent magnetism already present in the ship.A
will add toB
will subtract fromC
may add to or subtract fromD
will not change
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单选题The permanent magnetism of a vessel may change in polarity due to（）.A
being moored for a long time on one headingB
being struck by lightingC
steaming from the north magnetic hemisphere to the south magnetic hemisphereD
loading a homogenous magnetic cargo such as steel plate，iron bars，etc
考题
单选题The permanent magnetism of a vessel may change in strength due to（）.A
a collision with another vesselB
being moored on a constant heading for a long period of timeC
being struck by lightningD
All of the above
考题
单选题What are the only magnetic compass correctors that correct for both permanent and induced effects of magnetism?（）A
Quadrantal spheresB
Heeling magnetsC
Athwartships magnetsD
Fore-and-aft magnets
考题
单选题The Flinders bar on a magnetic compass compensates for the（）.A
induced magnetism in vertical soft ironB
induced magnetism in horizontal soft ironC
permanent magnetism in ship's steelD
vessel's inclination from the vertical
考题
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（）.A
fore-and-aft and athwartships magnetsB
dip needle and heeling magnetC
heeling magnet and Flinders barD
Flinders bar and quadrantal spheres
考题
单选题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
考题
单选题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
考题
单选题Permanent magnetism is found in（）.A
hard ironB
soft ironC
vertical iron onlyD
horizontal iron only
考题
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.A
hammering and jarringB
vibration and poundingC
varying magnetic fieldsD
stable or permanent magnetism of the ship
考题
单选题The error in a magnetic compass caused by the vessel’s magnetism is called（）.A
variationB
deviationC
compass errorD
bearing error
考题
单选题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
考题
单选题Magnets are placed in horizontal trays in the compass binnacle to compensate for the（）.A
induced magnetism in the vessel's horizontal soft ironB
change in the magnetic field when the vessel inclines from verticalC
permanent magnetism of the vesselD
magnetic fields caused by electrical currents in the vicinity
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