This induced magnetism()the permanent magnetism already pres

题目
单选题
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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第1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 jarring

B.vibration and pounding

C.varying magnetic fields

D.stable or permanent magnetism of the ship


正确答案:A

第2题:

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


正确答案:B

第3题:

Permanent magnetism is found in ______.

A.hard iron

B.soft iron

C.vertical iron only

D.horizontal iron only


正确答案:A

第4题:

Compass deviation is caused by ______.

A.magnetism from the earth’s magnetic field

B.misalignment of the compass

C.magnetism within the vessel

D.a dirty compass housing


正确答案:C
罗经自差由船舶内部的磁力导致。

第5题:

A single vertical magnet placed underneath the compass in the binnacle is used to compensate for ______.

A.The horizontal component of the permanent magnetism

B.Deviation caused by the vessel's inclination from the vertical

C.Induced magnetism in the horizontal soft iron

D.Induced magnetism in the vertical soft iron


正确答案:B

第6题:

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


正确答案:D

第7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 necessary

B.Semiannually

C.Annually

D.Every five years


正确答案:C

第8题:

The permanent magnetism of a vessel may change in strength due to ______.

A.the nature of the cargo being carried

B.changes in heading

C.major structural repair

D.All of the above


正确答案:C

第9题:

Before a magnetic compass is adjusted certain correctors must be checked to ensure that they are free of permanent magnetism.These correctors are the ______.

A.Fore-and-aft and athwartships magnets

B.Dip needle and heeling magnet

C.Heeling magnet and Flinders bar

D.Flinders bar and quadrantal spheres


正确答案:D

第10题:

Magnetism which is present only when the material is under the influence of an external field is called ______.

A.permanent magnetism

B.induced magnetism

C.residual magnetism

D.terrestrial magnetism


正确答案:B
表现为仅仅当材料在外部磁场的影响下才有磁性叫做感应磁性。

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