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单选题
The permanent magnetism of a vessel may change in strength due to（）.
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
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Permanent magnetism is found in ______.A.hard ironB.soft ironC.vertical iron onlyD.horizontal iron only
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The permanent magnetism of a vessel may change in strength due to ______.A.the nature of the cargo being carriedB.changes in headingC.major structural repairD.All of the above
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A ship under construction or major repair will acquire permanent magnetism due to ______ while sitting stationary in the earth's magnetic field．A.hammering and jarringB.vibration and poundingC.varying magnetic fieldsD.stable or permanent magnetism of the ship
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This induced magnetism ______ the permanent magnetism already present in the ship．A.will add toB.will subtract fromC.may add to or subtract fromD.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 barB.Soft iron spheresC.Fore-and-aft permanent magnets in their traysD.Heeling magnet
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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 magnetismB.subpermanent magnetismC.induced magnetismD.variable magnetism
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The Flinders bar and the quadrantal spheres should be tested for permanent magnetism at what interval ________．A.They are not subject to permanent magnetism; no check is necessaryB.SemiannuallyC.AnnuallyD.Every five years
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A single vertical magnet placed underneath the compass in the binnacle is used to compensate for ______．A.The horizontal component of the permanent magnetismB.Deviation caused by the vessel's inclination from the verticalC.Induced magnetism in the horizontal soft ironD.Induced magnetism in the vertical soft iron
考题
If a ship is proceeding towards the magnetic equator, the uncorrected deviation due to permanent magnetism ______.A.increasesB.remains the sameC.decreasesD.is unimportant and may be neglected
考题
If your vessel is the stand-on vessel in a crossing situation ______.A.you must keep your course and speedB.you may change course and speed as the other vessel must keep clearC.the other vessel must keep her course and speedD.both vessels must keep their course and speed
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Magnetism which is present only when the material is under the influence of an external field is called ______.A.permanent magnetismB.induced magnetismC.residual magnetismD.terrestrial magnetism
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单选题If your vessel is the stand-on vessel in a crossing situation（）.A
You must keep your course and speedB
You may change course and speed as the other vessel must keep clearC
The other vessel must keep her course and speedD
Both vessels must keep their course and speed
考题
单选题If a ship is proceeding towards the magnetic equator，the uncorrected deviation due to permanent magnetism（）.A
increasesB
remains the sameC
decreasesD
is unimportant and may be neglected
考题
单选题Risk of collision may be deemed to exist（）.A
if the compass bearing of an approaching vessel does not appreciably changeB
even when an appreciable bearing change is evident, particularly when approaching a vessel at close rangeC
if you observe both sidelights of a vessel ahead for an extended period of timeD
All of the above
考题
单选题What is used to correct for both induced and permanent magnetism，and consequently must be readjusted with radical changes in latitude（）.A
Flinders barB
Soft iron spheresC
Fore-and-aft permanent magnets in their traysD
Heeling magnet
考题
单选题This induced magnetism（）the permanent magnetism already present in the ship.A
will add toB
will subtract fromC
may add to or subtract fromD
will not change
考题
单选题The permanent magnetism of a vessel may change in polarity due to（）.A
being moored for a long time on one headingB
being struck by lightingC
steaming from the north magnetic hemisphere to the south magnetic hemisphereD
loading a homogenous magnetic cargo such as steel plate，iron bars，etc
考题
单选题When shall the stand-on vessel change course and speed?（）A
the stand-on vessel may change course and speed at any time as it has the right of wayB
after the give-way vessel sounds one blast in a crossing situationC
when action by the give-way vessel alone cannot prevent collisionD
when the two vessels become less than half a mile apart
考题
单选题Risk of collision may exist（）.A
if the compass bearing of an approaching vessel does not appreciably changeB
even when an appreciable bearing change is evident, particularly when approaching a vessel at close rangeC
if you observe both sidelights of a vessel ahead for an extended period of timeD
All of the above
考题
单选题The Flinders bar and the quadrantal spheres should be tested for permanent magnetism at what interval（）.A
They are not subject to permanent magnetism; no check is necessaryB
SemiannuallyC
AnnuallyD
Every five years
考题
单选题The permanent magnetism of a vessel may change in strength due to（）.A
the nature of the cargo being carriedB
changes in headingC
major structural repairD
All of the above
考题
单选题Mooring with two bow anchors has which major advantage over anchoring with one bow anchor? （）.A
The vessel will not reverse direction in a tidal currentB
The radius of the vessel's swing will be shortenedC
A mooring approach may be made from any directionD
The vessel will not swing with a change in wind
考题
单选题Permanent magnetism is found in（）.A
hard ironB
soft ironC
vertical iron onlyD
horizontal iron only
考题
单选题A ship under construction or major repair will acquire permanent magnetism due to（）while sitting stationary in the earth’s magnetic field.A
hammering and jarringB
vibration and poundingC
varying magnetic fieldsD
stable or permanent magnetism of the ship
考题
单选题A single vertical magnet placed underneath the compass in the binnacle is used to compensate for（）.A
the horizontal component of the permanent magnetismB
deviation caused by the vessel's inclination from the verticalC
induced magnetism in the horizontal soft ironD
induced magnetism in the vertical soft iron
考题
单选题If a towing vessel and her tow are severely restricted in their ability to change course，they may show lights in addition to their towing identification lights. These additional lights may be shown if the tow is（）.A
pushed aheadB
towed alongsideC
towed asternD
Any of the above
考题
单选题Magnets are placed in horizontal trays in the compass binnacle to compensate for the（）.A
induced magnetism in the vessel's horizontal soft ironB
change in the magnetic field when the vessel inclines from verticalC
permanent magnetism of the vesselD
magnetic fields caused by electrical currents in the vicinity
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