磁场（magnetic field）

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• The vertical component of the Earth’s magnetic field causes induced magnetism in vertical soft iron. This changes with latitude. What corrects for this coefficient of the deviation? （）

  A . The Flinders bar B . The heeling magnet C . Quadrantal soft iron spheres D . Bar magnets in the binnacle

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• What are the only magnetic compass correctors that correct for both permanent and induced effects of magnetism?（）

  A . Quadrantal spheres B . Heeling magnets C . Athwartships magnets D . Fore-and-aft magnet

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• Any piece of metal on becoming magnetized will develop regions of concentrated magnetism called（）.

  A . flux B . poles C . magnets D . azimuth

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• The coil of wire rotating in the magnetic field produces the（）.

  A . voltage B . current C . power D . frequency

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• Permanent magnetism is caused by（）.

  A . operation of electrical equipment and generators on board ship B . the earth's magnetic field affecting the ship's hard iron during construction C . the horizontal component of the earth's magnetic field acting on the horizontal soft iron D . the vertical component of the earth's magnetic field acting on the vertical soft iro

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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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• Which magnetic compass corrector（s）CANNOT be set on a heading of magnetic east or magnetic west（）.

  A . Heeling magnet B . Flinders bar C . Fore-and-aft magnets D . All of the above can be set on magnetic east or magnetic west heading

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• If a ship is proceeding towards the magnetic equator，the uncorrected deviation due to permanent magnetism（）.

  A . increases B . remains the same C . decreases D . is unimportant and may be neglected

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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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• 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 shi

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• Magnets in the binnacles of magnetic compasses are used to reduce the effect of（）.

  A . deviation B . variation C . local attraction D . All of the above

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• If a magnetic compass is not affected by any magnetic field other than the Earth’s，which statement is TRUE?（）.

  A . Compass error and variation are equal B . Compass north will be true north C . Variation will equal deviation D . There will be no compass error

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• At the magnetic equator there is no induced magnetism in the vertical soft iron because（）.

  A . the lines of force cross the equator on a 0°-180°alignment B . the quadrantal error is 0° C . there is no vertical component of the Earth's magnetic field D . the intercardinal headings have less than 1&deg

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• “*magnetic”属于位置检索的检索表达式。

  A . 正确 B . 错误

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• The magnetic field is provided by electromagnets so arranged that adjacent poles have （）.

  A . opposite polarity B . the same polarity C . negative polarity D . positive polarity

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• Induced magnetism is found in（）.

  A . hard iron B . soft iron C . vertical iron only D . horizontal iron only

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• Magnetic compass deviation（）.

  A . varies depending upon the bearing used B . is the angular difference between magnetic north and compass north C . is published on the compass rose on most nautical charts D . is the angular difference between geographic and magnetic meridia

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• 标有“Magnetized Material”字样的标签是（）标签。

  A . 远离热源 B . 包装件向上 C . 深冷液化气体 D . 磁性物质

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• 266. Magnetic compass deviation ______.

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• 13、如果电流发生变化，磁场也将变化。 __________________________, the magnetic field will change as well.

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• The cause of the transition of the Earth's magnetic field comes from ___.

  A．the movement deep inside the Earth B．the periodically reverses of the Earth C．the force coming from outer space D．the mechanical movement of the Earth 此题为多项选择题。

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• The Inductrack Ⅱ design can produce a very strong magnetic field even when the train runs more slowly by ______.

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• 请翻译以下内容和10个部件，并简要说明它们的各自功能。 All CRT monitors have a CRT, which is a vacuum tube. One end of this tube is a slender cylinder that consists of three electron guns. The wide end of the CRT is the display screen. When power is applied to one or more of the electron guns, a stream of electrons is generated. This stream is subjected to a magnetic field generated by a ring of electromagnets called a yoke. The phosphor coating, when struck by the electro

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• 44、一带电粒子与磁感应线成任意角度射入匀强磁场，则它作___运动； If the electric particle and the magnetic induction line are injected into the uniform magnetic field at any Angle, it will do ___ motion.

  A．直线； straight lines; B．变速率圆周； speed change rate of the circumference; C．匀速率圆周； uniform speed of the circumference; D．（D）螺线； spiral;

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