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单选题
The lubber’s line of a magnetic compass（）.
A
always shows true north direction
B
indicates the vessel's heading
C
is always parallel to the vessel's transom
D
is located on the compass card
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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
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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
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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
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south magnetic poleC
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单选题Deviation in a compass is caused by the（）.A
vessel's geographic positionB
vessel's headingC
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influence of the magnetic materials of the vessel
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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
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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
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单选题Which magnetic compass corrector（s）CANNOT be set on a heading of magnetic east or magnetic west（）.A
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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The greatest directive force is exerted on the magnetic compass when the（）.A
needles are nearly in line with the meridianB
vessel is near the magnetic polesC
variation is near zeroD
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单选题Which magnetic compass corrector（s）can be set while the vessel is on a heading of magnetic north or magnetic south（）.A
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单选题Magnetic dip is a measurement of the angle between the（）.A
geographic pole and the magnetic poleB
lubber's line and true northC
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compass heading and the magnetic heading
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
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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
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单选题What is the basic principle of the magnetic compass（）.A
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单选题The lubber’s line on a magnetic compass indicates（）.A
compass northB
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a relative bearing taken with an azimuth circle
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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单选题The magnetic compass operates on the principle that（）.A
like magnetic poles attractB
unlike magnetic poles repelC
unlike poles attractD
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考题
单选题The error in a magnetic compass caused by the vessel’s magnetism is called（）.A
variationB
deviationC
compass errorD
bearing error
考题
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（）.A
the compass heading is in line with the lubber's lineB
there is no lost motion in the gimbal ringsC
no change of heading by compass is observed if you raise and lower the heeling magnetD
the gimbal rings do not strike the compass frame when they are tilted
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
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考题
单选题Magnetic information on a chart may be （）.A
found in the center(s) of the compass rose(s)B
indicated by isogonic linesC
found in a note on the chartD
All of the above
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