单选题By convention,the north seeking ends of a compass’ magnets are colored().ABlackBBlueCRedDWhite
单选题
By convention,the north seeking ends of a compass’ magnets are colored().
A
Black
B
Blue
C
Red
D
White
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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
Which magnetic compass corrector(s)can be set while the vessel is on a heading of magnetic north or magnetic south ________.A.Quadrantal spheresB.Heeling magnetsC.Flinders barD.Fore-and-aft magnets
A compass card without north-seeking capability that is used for relative bearings is a(n)______.A.Bearing circleB.PelorusC.Bearing barD.Alidade
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
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
填空题The regulation of marine pollution in the North East Atlantic Region is based on the OSPAR Convention.____
单选题A compass card without north-seeking capability that is used for relative bearings is a(n)().Abearing circleBpelorusCbearing barDalidade
单选题When adjusting a magnetic compass using the fore-and-aft permanent magnets,you should().Ause the magnets one at a time,putting one in one side and then one on the opposite side,one step higherBuse the magnets in pairs,starting at the top,with trays at the highest point of travelCuse the magnets in pairs,from the bottom up,with the trays at the lowest point of travelDfill all the trays with magnets,then remove them one-by-one until the deviation is removed
单选题Deviation is the angle between the().Atrue meridian and the axis of the compass cardBtrue meridian and the magnetic meridianCmagnetic meridian and the axis of the compass cardDaxis of the compass card and the degaussing meridian
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The lubber’s line of a magnetic compass().Aalways shows true north directionBindicates the vessel's headingCis always parallel to the vessel's transomDis located on the compass card
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
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 magnetsBIf 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
单选题Which magnetic compass corrector(s)can be set while the vessel is on a heading of magnetic north or magnetic south().AQuadrantal spheresBHeeling magnetsCFlinders barDFore-and-aft magnets
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
单选题To center a compass bowl in its binnacle,you should have the ship on an even keel,heading north or south,and adjust the screws until().Athe compass heading is in line with the lubber's lineBthere is no lost motion in the gimbal ringsCno change of heading by compass is observed if you raise and lower the heeling magnetDthe gimbal rings do not strike the compass frame when they are tilted
单选题Magnetic compass deviation().Avaries depending upon the bearing usedBis the angular difference between magnetic north and compass northCis published on the compass rose on most nautical chartsDis the angular difference between geographic and magnetic meridians
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
单选题If you()a magnet-needle, its two ends can point North and South, and so it can be used to determine directions.AovertakeBfixChighlightDsuspend