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单选题
Deviation which is maximum on intercardinal compass headings may be removed by the（）.
A
Flinders bar
B
transverse magnets
C
fore-and-aft magnets
D
soft iron spheres on the sides of the compass
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The compass error of a magnetic compass that has no deviation is ______.A.zeroB.equal to variationC.eliminated by adjusting the compassD.constant at any geographical location
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When an azimuth of the Sun has been taken and the deviation of the standard magnetic compass computed，the watch officer should record the results ______.A.in the vessel's Official LogbookB.on the compass deviation cardC.in the compass deviation logD.on a Napier diagram
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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
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Deviation which is maximum on intercardinal compass headings may be removed by the ______．A.Flinders barB.Transverse magnetsC.Fore-and-aft magnetsD.Soft iron spheres on the sides of the compass
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Heeling error is defined as the change of deviation for a heel of ______．A.2° while the vessel is on an intercardinal headingB.1° while the vessel is on a compass heading of 000°C.2° and is constant on all headingsD.1° while the vessel is on a compass heading of 180°
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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
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Compass error is equal to the ______.A.deviation minus variationB.variation plus compass courseC.combined variation and deviationD.difference between true and magnetic heading
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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
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If the compass heading and magnetic-heading are the same then ______.A.the deviation has been offset by the variationB.there is something wrong with the compassC.the compass is being influenced by nearby metalsD.there is no deviation on that heading
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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
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Magnetic heading differs from compass heading by______．A.compass errorB.true headingC.variationD.Deviation
考题
单选题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
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 compass deviation changes as the vessel changes（）.A
geographical positionB
speedC
headingD
longitude
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If the magnetic heading is greater than the compass heading，the deviation is（）.A
eastB
westC
northD
south
考题
单选题If the compass heading and the magnetic heading are the same then（）.A
the deviation has been offset by the variationB
there is something wrong with the compassC
the compass is being influenced by nearby metalsD
there is no deviation on that heading
考题
单选题When a vessel changes course from one cardinal heading to another cardinal heading whilea djusting the compass，which action should be taken?（）A
The course change should be made rapidly to prevent transient induced magnetism while passing the intercardinal headingsB
After the new heading is reached，the vessel should steam on that course for at least two minutes before the adjustmentC
During the course change，you should gently tap the compass to remove any error caused by friction on the pivot bearingD
After steadying on the new heading，the compass card should be slewed by a magnet and allowed to oscillate freely to remove any gaussin error
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The total magnetic effects which cause deviation of a vessel’s compass can be broken down into a series of components which are referred to as（）.A
divisional partsB
coefficientsC
fractional partsD
equations
考题
单选题If the gyrocompass error is east，what describes the error and the correction to be made to gyrocompass headings to obtain true headings?（）A
The readings are too low (small numerically) and the amount of the error must be added to the compass to obtain trueB
The readings are too low and the amount of the error must be subtracted from the compass to obtain trueC
The readings are too high (large numerically) and the amount of the error must be added to the compass to obtain trueD
The readings are too high and the amount of the error must be subtracted from the compass to obtain true
考题
单选题The quadrantal spheres are used to（）.A
Remove deviation on the intercardinal headingsB
Remove deviation on the cardinal compass headingsC
Remove heeling errorD
Compensate for induced magnetism in vertical soft iron
考题
单选题Quadrantal error in a gyrocompass has its GREATEST effect（）.A
in high latitudesB
near the equatorC
on north or south headingsD
on intercardinal headings
考题
单选题The compass error of a magnetic compass that has no deviation is（）.A
zeroB
equal to variationC
eliminated by adjusting the compassD
constant at any geographical location
考题
单选题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
单选题When adjusting a magnetic compass for error，a deviation table should be made（）.A
before correcting for any deviationB
after correcting for variationC
after adjusting the fore-and-aft and athwartships permanent magnetsD
before the quadrantal correctors are placed on the compass
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