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
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
相关考题：
Permanent magnetism is found in ______.A.hard ironB.soft ironC.vertical iron onlyD.horizontal iron only
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
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
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
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（）on board ship are used to control and distribute the electrical energy generated by generators.AGovernorsBAlternatorsCBlackboardsDSwitchboards
单选题When a rescuer finds an electrical burn victim in the vicinity of live electrical equipment or wiring，his first step is to（）.Aflush water over any burned area of the patientBapply ointment to the burned areas on the patientCget assistance to shut down electrical power in the areaDremove the patient from the vicinity of the live electrical equipment or wiring
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Electrical failures in motors are caused by the breakdown of insulation, which may be caused by （）Apenetration of moistureBaccumulation of dirtCoverheatingDAll 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Steering gears can be arranged with hydraulic control equipment known as a （）, or with electrical control equipment.AtelemeterBtelemanometerCtelemotorDtelemometer
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The error in a magnetic compass caused by the vessel’s magnetism is called（）.AvariationBdeviationCcompass errorDbearing error
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Magnets are placed in horizontal trays in the compass binnacle to compensate for the（）.Ainduced magnetism in the vessel's horizontal soft ironBchange in the magnetic field when the vessel inclines from verticalCpermanent magnetism of the vesselDmagnetic fields caused by electrical currents in the vicinity