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单选题
What is the basic principle of the magnetic compass().
A

Magnetic materials of the same polarity repel each other and those of opposite polarity attract

B

The Earth's magnetic lines of force are parallel to the surface of the Earth

C

Magnetic meridians connect points of equal magnetic variation

D

The compass needle(s)will,when properly compensated,lie parallel to the isogonic lines of the Earth


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更多 “单选题What is the basic principle of the magnetic compass().A Magnetic materials of the same polarity repel each other and those of opposite polarity attractB The Earth's magnetic lines of force are parallel to the surface of the EarthC Magnetic meridians connect points of equal magnetic variationD The compass needle(s)will,when properly compensated,lie parallel to the isogonic lines of the Earth” 相关考题
考题 Which one of the followings is incorrect about magnetic compass?______.A.The magentic compass is compulsory on my vesselB.The magentic compass is prone to errorC.The magentic compass is always placed inside steel constructionsD.The magentic compass needs to be calibrated to compensate for local magnetic distortion

考题 On a nautical chart,the inner ring of a compass rose indicates ______.A.true directionsB.compass errorC.deviationD.magnetic directions

考题 A vessel is heading magnetic north and its magnetic compass indicates a heading of 003°. What action should be taken to remove this error during compass adjustment?A.Move the quadrantal spheres closer to the compassB.Raise the heeling magnet if the red end is upC.Remove some of the Flinders barD.Raise or lower the athwartship magnets

考题 Deviation is the angle between the ______.A.true meridian and the axis of the compass cardB.true meridian and the magnetic meridianC.magnetic meridian and the axis of the compass cardD.axis of the compass card and the degaussing meridian

考题 If a magnetic compass is not affected by any magnetic field other than the Earth’s which statement is TRUE?______.A.Compass error and variation are equalB.Compass north will be true northC.Variation will equal deviationD.There will be no compass error

考题 Magnetic compass deviation______.A.varies depending upon the bearing usedB.is the angular difference between magnetic north and compass northC.is published on the compass rose on most nautical chartsD.is the angular difference between geographic and magnetic meridians

考题 Magnetic heading differs from compass heading by______.A.compass errorB.true headingC.variationD.Deviation

考题 Magnetic dip is a measurement of the angle between the ______.A.geographic pole and the magnetic poleB.lubber’s line and true northC.horizontal and the magnetic line of forceD.compass heading and the magnetic heading

考题 单选题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

考题 单选题The magnetic compass magnets are acted on by the horizontal component of the Earth’s total magnetic force. This magnetic force is GREATEST at the().A north magnetic poleB south magnetic poleC magnetic prime vertical meridianD magnetic equator

考题 单选题If a magnetic compass is not affected by any magnetic field other than the Earth’s,which statement is TRUE? ()A Compass error and variation are equalB Compass north will be true northC Variation will equal deviationD There will be no compass error

考题 单选题Deviation is the angle between the().A true meridian and the axis of the compass cardB true meridian and the magnetic meridianC magnetic meridian and the axis of the compass cardD axis of the compass card and the degaussing meridian

考题 单选题The horizontal angle between the magnetic meridian and the north-south line of the magnetic compass is().A deviationB variationC compass errorD dip

考题 单选题As a vessel changes course to starboard,the compass card in a magnetic compass().A remains aligned with compass northB also turns to starboardC first turns to starboard then counterclockwise to portD turns counterclockwise to port

考题 单选题Which magnetic compass corrector(s)CANNOT be set on a heading of magnetic east or magnetic west().A Heeling magnetB Flinders barC Fore-and-aft magnetsD All of the above can be set on magnetic east or magnetic west headings

考题 单选题A vessel is heading magnetic northwest and its magnetic compass indicates a heading of 312°. What action should be taken to remove this error during compass adjustment? ()A If the quadrantal spheres are all the way out,replace them with smaller spheresB If the quadrantal spheres are all the way in,replace them with larger spheresC If the quadrantal spheres are all of the way out,move the spheres inD If the quadrantal spheres are all the way out,replace them with larger spheres.

考题 单选题A vessel is heading magnetic north and its magnetic compass indicates a heading of 003°. What action should be taken to remove this error during compass adjustment? ()A Move the quadrantal spheres closer to the compassB Raise the heeling magnet if the red end is upC Remove some of the Flinders barD Raise or lower the athwartship magnets

考题 单选题A vessel is heading magnetic northwest and its magnetic compass indicates a heading of 317°. What action should be taken to remove this error during compass adjustment? ()A If the quadrantal spheres are out as far as possible replace them with smaller spheresB If the quadrantal spheres are in as far as possible remove one of the spheresC If the quadrantal spheres are in as far as possible replace them with smaller spheresD If the quadrantal spheres are out as far as possible,move the quadrantal spheres in

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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Variation in a compass is caused by().A worn gears in the compass housingB magnetism from the earth's magnetic fieldC magnetism within the vesselD lack of oil in the compass bearings

考题 单选题The principal purpose of magnetic compass adjustment is to().A reduce the variation as much as possibleB reduce the deviation as much as possibleC reduce the magnetic dip as much as possibleD allow the compass bowl to swing freely on its gimbals

考题 单选题What is an advantage of the magnetic compass aboard vessels?()A Compass error is negligible at or near the earth's magnetic polesB It does not have to be checked as oftenC It is reliable due to it's essential simplicityD All points on the compass rose are readily visible

考题 单选题The principal purpose of adjustment of the magnetic compass is to eliminate()as far as possible.A variationB compass errorC deviationD earth's magnetic force

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