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单选题
The lubber’s line on a magnetic compass indicates（）.
A
compass north
B
the direction of the vessel's head
C
magnetic north
D
a relative bearing taken with an azimuth circle
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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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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
north magnetic poleB
south magnetic poleC
magnetic prime vertical meridianD
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单选题Deviation in a compass is caused by the（）.A
vessel's geographic positionB
vessel's headingC
earth's magnetic fieldD
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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单选题The lubber’s line of a magnetic compass（）.A
always shows true north directionB
indicates the vessel's headingC
is always parallel to the vessel's transomD
is located on the compass card
考题
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? （）A
Move the quadrantal spheres closer to the compassB
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Remove some of the Flinders barD
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单选题A vessel is heading magnetic northwest and its magnetic compass indicates a heading of 317°. What action should be taken to remove this error during compass adjustment? （）A
If the quadrantal spheres are out as far as possible replace them with smaller spheresB
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单选题The greatest directive force is exerted on the magnetic compass when the（）.A
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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
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考题
单选题Variation in a compass is caused by（）.A
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magnetism from the earth's magnetic fieldC
magnetism within the vesselD
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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
考题
单选题What is the basic principle of the magnetic compass（）.A
Magnetic materials of the same polarity repel each other and those of opposite polarity attractB
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Magnetic meridians connect points of equal magnetic variationD
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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
the poles of the compass line up with the geographic poles of the earth
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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
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