单选题The principal purpose of adjustment of the magnetic compass is to eliminate()as far as possible.AvariationBcompass errorCdeviationDearth's magnetic force

单选题
The principal purpose of adjustment of the magnetic compass is to eliminate()as far as possible.
A

variation

B

compass error

C

deviation

D

earth's magnetic force


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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

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

You are about to go to sea and adjust the magnetic compass.To expedite the adjustment at sea,in what order should the following dockside adjustments be made ________.A.Flinders bar first,then the heeling magnet and spheresB.Heeling magnet first,then the Flinders bar and spheresC.Flinders bar first,then the spheres and heeling magnetD.Spheres first,then the Flinders bar and heeling magnet

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

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

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

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

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

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().Anorth magnetic poleBsouth magnetic poleCmagnetic prime vertical meridianDmagnetic equator

单选题If a magnetic compass is not affected by any magnetic field other than the Earth’s,which statement is TRUE? ()ACompass error and variation are equalBCompass north will be true northCVariation will equal deviationDThere will be no compass error

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单选题The horizontal angle between the magnetic meridian and the north-south line of the magnetic compass is().AdeviationBvariationCcompass errorDdip

单选题As a vessel changes course to starboard,the compass card in a magnetic compass().Aremains aligned with compass northBalso turns to starboardCfirst turns to starboard then counterclockwise to portDturns counterclockwise to port

单选题Which magnetic compass corrector(s)CANNOT be set on a heading of magnetic east or magnetic west().AHeeling magnetBFlinders barCFore-and-aft magnetsDAll of the above can be set on magnetic east or magnetic west headings

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? ()AIf the quadrantal spheres are all the way out,replace them with smaller spheresBIf the quadrantal spheres are all the way in,replace them with larger spheresCIf the quadrantal spheres are all of the way out,move the spheres inDIf the quadrantal spheres are all the way out,replace them with larger spheres.

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? ()AMove the quadrantal spheres closer to the compassBRaise the heeling magnet if the red end is upCRemove some of the Flinders barDRaise or lower the athwartship magnets

单选题A vessel is heading magnetic east and its magnetic compass indicates a heading of 086°. Which action should be taken to remove this error during compass adjustment?()AIf the blue ends of the magnets are aft,and the fore-and-aft tray is at the top,you should add some magnets.BIf the blue ends of the magnets are aft you should lower the fore-and-aft trayCIf the blue ends of the magnets are aft,and the fore-and-aft tray is at the top,you should reverse the magnetsDIf the blue ends of the magnets are forward,and the fore-and-aft tray is at the bottom,you should add some magnets

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单选题The greatest directive force is exerted on the magnetic compass when the().Aneedles are nearly in line with the meridianBvessel is near the magnetic polesCvariation is near zeroDvessel is near the magnetic equator

单选题Variation in a compass is caused by().Aworn gears in the compass housingBmagnetism from the earth's magnetic fieldCmagnetism within the vesselDlack of oil in the compass bearings

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