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
This induced magnetism（）the permanent magnetism already present in the ship.
The magnetism in the various structures of a ship changing as a result of cruising，vibration，or aging is termed（）.
When adjusting a magnetic compass using the fore-and-aft permanent magnets，you should（）.
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（）.
The variation for most given areas undergoes（）change，the amount of which is also noted on charts.
Which magnetic compass corrector（s）can be set while the vessel is on a heading of magnetic north or magnetic south（）.
When a magnetic compass is not in use for a prolonged period of time it should（）.
What is the name of the movable，radial guide line used to measure direction on a radar?（）
What is used to correct for both induced and permanent magnetism，and consequently must be readjusted with radical changes in latitude（）.
The Flinders bar and the quadrantal spheres should be tested for permanent magnetism at what interval（）.