航海英语(甲类船长)航海仪器单选题练习1
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Which magnetic compass corrector（s）can be set while the vessel is on a heading of magnetic north or magnetic south ________．
- A.Quadrantal spheres
- B.Heeling magnets
- C.Flinders bar
- D.Fore-and-aft magnets
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Which compensates for errors introduced when the vessel heels over ________．
- A.The soft iron spheres on the arms of the binnacle
- B.Magnets placed in trays inside the binnacle
- C.A single vertical magnet beneath the compass
- D.The Flinders bar
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When relieving the helm，the new helmsman should know the ______．
- A.Course per magnetic steering compass
- B.Gyro error
- C.Variation
- D.Maximum rudder angle previously used
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When a vessel changes course from one cardinal heading to another cardinal heading while adjusting the compass，which action should be taken ________．
- A.The course change should be made rapidly to prevent transient induced magnetism while passing the intercardinal headings
- B.After the new heading is reached，the vessel should steam on that course for at least two minutes before the adjustment
- C.During the course change，you should gently tap the compass to remove any error caused by friction on the pivot bearing
- D.After steadying on the new heading，the compass card should be slewed by a magnet and allowed to oscillate freely to remove any gaussin error
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When crossing the magnetic equator the ______．
- 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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This induced magnetism ______ the permanent magnetism already present in the ship．
- A.will add to
- B.will subtract from
- C.may add to or subtract from
- D.will not change
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What is used to correct for both induced and permanent magnetism，and consequently must be readjusted with radical changes in latitude ________．
- A.Flinders bar
- B.Soft iron spheres
- C.Fore-and-aft permanent magnets in their trays
- D.Heeling magnet
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The most accurate method of determining gyrocompass error while underway is by ______．
- A.Comparing the gyro azimuth of a celestial body with the computed azimuth of the body
- B.Comparing the gyro heading with the magnetic compass heading
- C.Determining from the chart the course made good between celestial fixes
- D.It cannot be determined accurately at sea due to drift of unknown currents
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The gyrocompass error resulting from your vessel's movement in OTHER than an east-west direction is called ______．
- A.Damping error
- B.Ballistic deflection
- C.Quadrantal error
- D.Speed error
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The magnetism in the various structures of a ship changing as a result of cruising，vibration，or aging is termed ______．
- A.permanent magnetism
- B.subpermanent magnetism
- C.induced magnetism
- D.variable magnetism
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