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单选题
The coil of wire rotating in the magnetic field produces the（）.
A
voltage
B
current
C
power
D
frequency
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Passage TwoQuestions 26 to 30 are based on the following passage.The electromagnet was invented in England by William Sturgeon，who took an iron rod and bent it into the shape of a horseshoe. This “horseshoe” was coated with varnish and a layer of copper wire was wrapped around it. An electric current was passed through the wire，thus making the rod magnetic. The rod was now，because of magnetic attraction，able to support nine pounds of iron. In the US，a scientist named Joseph Henry improved on Sturgeon's electromagnet by insulating the copper wine with silk. He was able to wrap many turns of wire around an iron core without danger of short circuits between the turns. His magnet could hold 2,300 pounds. This experiment prompted Henry to try his hand at converting magnetism into electricity. First he coiled some insulated wire around an iron bar. connecting both ends of the wire to a galvanometer(电流表). The iron bar was placed across the poles of the electromagnet. Then the coil of the electromagnet was connected to a battery. The galvanometer indicated a voltage，then dropped to zero. Henry signaled his assistant to disconnect the coil. The galvanometer showed that once again a voltage had been produced，although this time in the opposite direction. The principle of electromagnetic induction had thus been discovered. Unfortunately for Joseph Henry he did not publish his findings and someone else(Faraday)got the credit for the discovery.The principle of electromagnetic was discovered by______.A. William SturgeonB. Joseph HenryC. FaradayD. someone else
考题
When placed in a magnetic field, which of the materials listed will maintain the highest permeability?( )A.GlassB.BakeliteC.Soft ironD.Aluminum
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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 equalB.Compass north will be true northC.Variation will equal deviationD.There will be no compass error
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单选题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 equalB
Compass north will be true northC
Variation will equal deviationD
There will be no compass error
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单选题An electrical device which employs a stationary armature and a rotating electromagnetic field is used aboard ship as a （）.A
magnetic amplifierB
ship’s service alternatorC
three-wire DC generatorD
saturable core reactor
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单选题To increase the frequency of an operating AC generator, you should （）A
increase the field excitationB
decrease the field excitationC
increase the number of magnetic polesD
increase the speed of the prime mover
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单选题Geological evidence suggests that the earth’s magnetic polarity has switched back and forth many times over the millennia; such ______in the magnetic field may affect the ability of our planet to ward off cosmic radiation.A
intensificationsB
justificationsC
recordsD
correlationsE
fluctuations
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单选题During the transition of the Earth’s magnetic field _____.A
the compass will become uselessB
man and animals will be confused as to directionsC
the magnetic strength of the Earth will disappearD
the magnetic strength of the Earth will be stronger
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单选题Aboard ship, a grounded field coil in an AC motor can be determined by using a （）.A
portable growlerB
galvanometerC
visual inspectionD
megohmmeter
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单选题When placed in a magnetic field, which of the materials listed will maintain the highest permeability?（）A
GlassB
BakeliteC
Soft ironD
Aluminum
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单选题According to the passage, _____.A
we should not worry about the transition of the Earth’s magnetic fieldB
the Earth’s magnetic field will not change for at least 2000 yearsC
the Earth’s magnetic field has decreased its strength rapidlyD
the transition of the Earth’s magnetic field can be controlled by modern science
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单选题If kinking results while wire rope is being coiled clockwise，you should（）.A
coil it counterclockwiseB
not coil itC
take a turn underD
twist out the kinks under a strain
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单选题A centrifugal pump produces the required pressure energy by means of a rotating （） provided with vanes.A
propellerB
impellerC
circumferenceD
screw
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单选题The magnetic field is provided by electromagnets so arranged that adjacent poles have （）.A
opposite polarityB
the same polarityC
negative polarityD
positive polarity
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单选题The frequency of an alternator at a given RPM is determined by the （）.A
number of turns of wire in the armature coilB
number of magnetic polesC
strength of the magnets usedD
output voltage
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单选题What will be the phase angle relationship of a six-pole, three-phase, rotating field generator （）.A
60B
120C
180D
360
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单选题Permanent magnetism is caused by（）.A
operation of electrical equipment and generators on board shipB
the earth's magnetic field affecting the ship's hard iron during constructionC
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the vertical component of the earth's magnetic field acting on the vertical soft iron
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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
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单选题The most common type of AC service generator found aboard ship is the stationary （）.A
electromagnetic field, revolving armature typeB
electromagnetic field, oscillatory armature typeC
armature, oscillatory electromagnet field typeD
armature, rotating electromagnetic field type
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