A.Flinders bar should be inverted
B.Heeling magnet should be inverted
C.The quadrantal spheres should be rotated 180°
D.Flinders bar should be moved to the opposite side of the binnacle
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A.Flinders bar
B.Soft iron spheres
C.Fore-and-aft permanent magnets in their trays
D.Heeling magnet
A.Magnetic materials of the same polarity repel each other and those of opposite polarity attract
B.The Earth's magnetic lines of force are parallel to the surface of the Earth
C.Magnetic meridians connect points of equal magnetic variation
D.The compass needle（s）will，when properly compensated，lie parallel to the isogonic lines of the Earth
A.Worn gears in the compass housing
B.Magnetism from the earth's magnetic field
C.Magnetism within the vessel
D.Lack of oil in the compass bearings
A.will add to
B.will subtract from
C.may add to or subtract from
D.will not change
A.an annual
B.a constant
C.a variable
D.an unstable
最新試題
Variation is the angular measurement between（）.
The most accurate method of determining gyrocompass error while underway is by（）.
The MOST important feature of the material used for making the binnacle of a standard magnetic compass is that it is（）.
What is the basic principle of the magnetic compass?（）
The variation for most given areas undergoes（）change，the amount of which is also noted on charts.
Which compensates for errors introduced when the vessel heels over（）.
The Flinders bar on a magnetic compass compensates for the（）.
By convention，the north seeking ends of a compass’ magnets are colored（）.
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（）.
When relieving the helm，the new helmsman should know the（）.