单选题The coil of wire rotating in the magnetic field produces the（）.AvoltageBcurrentCpowerDfrequency
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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相关考题：
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
When placed in a magnetic field, which of the materials listed will maintain the highest permeability?( )A.GlassB.BakeliteC.Soft ironD.Aluminum
An electrical device which employs a stationary armature and a rotating electromagnetic field is used aboard as aA.magnetic amplifierB.ship's service alternatorC.three-wire DC generatorD.saturable core reactor
The frequency of an alternator at a given r/min 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
What will be the phase angle relationship of a six-pole, three-phase, rotating field generator?A.60B.120C.180D.360
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.the horizontal component of the earth's magnetic field acting on the horizontal soft ironD.the vertical component of the earth's magnetic field acting on the vertical soft iron
The American Petroleum Institute recommends magnetic particle inspection for ______.A.anchor chainB.wire ropeC.connecting linksD.pendant wires
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
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.AintensificationsBjustificationsCrecordsDcorrelationsEfluctuations
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单选题Permanent magnetism is caused by（）.Aoperation of electrical equipment and generators on board shipBthe earth's magnetic field affecting the ship's hard iron during constructionCthe horizontal component of the earth's magnetic field acting on the horizontal soft ironDthe vertical component of the earth's magnetic field acting on the vertical soft iron
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.Ahammering and jarringBvibration and poundingCvarying magnetic fieldsDstable or permanent magnetism of the ship
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