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
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 magnets
B.Dip needle and heeling magnet
C.Heeling magnet and Flinders bar
D.Flinders bar and quadrantal spheres
相关考题：
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
Before sailing，mariners on duty shall check the headings of magnetic compass by comparison with ______.A.ship's clockB.engine movement recorderC.repeatersD.navigation lights
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Before sailing，mariners on duty shall check the headings of magnetic compass by comparison with（）.Aship's clockBengine movement recorderCrepeatersDnavigation lights
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
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Your experiment reports must be checked with care before _____.Ahanded them inBthem handing inCbeing handed inDhanding them in
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Before starting any diesel or gasoline engine，which of the following must be checked? （）AOil levelBFlow of cooling waterCExhaust dischargeDAll 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The principal purpose of magnetic compass adjustment is to（）.Areduce the variation as much as possibleBreduce the deviation as much as possibleCreduce the magnetic dip as much as possibleDallow the compass bowl to swing freely on its gimbals
单选题What is an advantage of the magnetic compass aboard vessels?（）ACompass error is negligible at or near the earth's magnetic polesBIt does not have to be checked as oftenCIt is reliable due to it's essential simplicityDAll points on the compass rose are readily visible
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（）.Afore-and-aft and athwartships magnetsBdip needle and heeling magnetCheeling magnet and Flinders barDFlinders bar and quadrantal spheres
单选题The magnetic compass operates on the principle that（）.Alike magnetic poles attractBunlike magnetic poles repelCunlike poles attractDthe poles of the compass line up with the geographic poles of the earth
单选题ECDIS must be able to perform all of the following EXCEPT（）.Adetermine true bearing and distance between two geographical pointsBdetermine magnetic compass deviationCtransform a local datum to the WGS-'84 datumDconvert graphical coordinates to display coordinates
单选题The compass error of a magnetic compass that has no deviation is（）.AzeroBequal to variationCeliminated by adjusting the compassDconstant at any geographical location
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When adjusting a magnetic compass for error，a deviation table should be made（）.Abefore correcting for any deviationBafter correcting for variationCafter adjusting the fore-and-aft and athwartships permanent magnetsDbefore the quadrantal correctors are placed on the compass