A.remove deviation on the intercardinal headings
B.remove deviation on the cardinal compass headings
C.remove heeling error
D.compensate for induced magnetism in vertical soft iron
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A.reduce the variation as much as possible
B.reduce the deviation as much as possible
C.reduce the magnetic dip as much as possible
D.allow the compass bowl to swing freely on its gimbals
A.a collision with another vessel
B.being moored on a constant heading for a long period of time
C.being struck by lightning
D.All of the above
A.being moored for a long time on one heading
B.being struck by lighting
C.steaming from the north magnetic hemisphere to the south magnetic hemisphere
D.loading a homogenous magnetic cargo such as steel plate，iron bars，etc
A.nonmagnetic
B.weatherproof
C.corrosion resistant
D.capable of being permanently affixed to the vessel
A.like magnetic poles attract
B.unlike magnetic poles repel
C.unlike poles attract
D.the poles of the compass line up with the geographic poles of the earth
最新試題
The Flinders bar on a magnetic compass compensates for the（）.
The line which connects the points of zero magnetic dip is（）.
A ship under construction or major repair will acquire permanent magnetism due to（）while sitting stationary in the earth’s magnetic field.
Which statement about the Flinders bar of the magnetic compass is CORRECT（）.
Which statement about the gyrocompass is FALSE（）.
While in drydock your vessel will be belt-gauged.This process involves（）.
What is used to correct for both induced and permanent magnetism，and consequently must be readjusted with radical changes in latitude（）.
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 adjusting a magnetic compass using the fore-and-aft permanent magnets，you should（）.
This induced magnetism（）the permanent magnetism already present in the ship.