電氣英語考試題庫及答案

一、單項選擇題（每題2分，共10題）1.Whichofthefollowingisaunitofelectricalresistance?A.VoltB.AmpereC.OhmD.Watt答案：C2.Thesymbolforcurrentinelectricalcircuitsis?A.VB.IC.RD.P答案：B3.InanACcircuit,thefrequencyismeasuredin?A.HertzB.OhmsC.VoltsD.Amperes答案：A4.Whichcomponentisusedtostoreelectricalcharge?A.ResistorB.CapacitorC.InductorD.Transistor答案：B5.Thepowerformulainelectricalcircuitsis?A.P=VIB.P=V/RC.P=I/RD.P=V+I答案：A6.Adevicethatconvertselectricalenergyintomechanicalenergyiscalled?A.GeneratorB.MotorC.TransformerD.Rectifier答案：B7.Whatisthecolorcodefora10-ohmresistor?A.Brown-black-blackB.Brown-black-brownC.Black-brown-blackD.Black-black-brown答案：A8.Inaseriescircuit,thecurrent?A.VariesacrosscomponentsB.IsthesamethroughoutC.IszeroD.Dependsontheresistance答案：B9.Whichtypeoftransformerhasmoreturnsinthesecondarycoilthanintheprimarycoil?A.Step-downtransformerB.Step-uptransformerC.IsolationtransformerD.Autotransformer答案：B10.Electricalconductivityismeasuredin?A.SiemenspermeterB.OhmspermeterC.AmperespermeterD.Voltspermeter答案：A二、多項選擇題（每題2分，共10題）1.Whichofthefollowingaretypesofelectricalmotors?A.DCmotorB.ACmotorC.SteppermotorD.Servomotor答案：ABCD2.Componentsusedinelectricalcircuitsinclude?A.ResistorsB.CapacitorsC.DiodesD.Transistors答案：ABCD3.Electricalsafetymeasuresmayinvolve?A.GroundingB.FusingC.InsulationD.Earthing答案：ABCD4.Thefollowingareelectricalpowersources?A.BatteryB.GeneratorC.SolarcellD.Fuelcell答案：ABCD5.Inanelectricalsystem,factorsaffectingresistanceare?A.LengthoftheconductorB.Cross-sectionalareaoftheconductorC.MaterialoftheconductorD.Temperatureoftheconductor答案：ABCD6.Whichofthefollowingcanbeusedforelectricalenergystorage?A.BatteryB.SupercapacitorC.FlywheelD.Compressedair答案：ABC7.Electricalsymbolsforcomponentsinclude?A.Resistor(R)B.Capacitor(C)C.Inductor(L)D.Diode(D)答案：ABCD8.Typesofelectricalwiringinclude?A.SolidwireB.StrandedwireC.CoaxialcableD.Twisted-paircable答案：ABCD9.Electricalcircuitscanbeclassifiedas?A.SeriescircuitsB.ParallelcircuitsC.CombinationcircuitsD.Meshcircuits答案：ABC10.Electricalmeasurementinstrumentsinclude?A.VoltmeterB.AmmeterC.OhmmeterD.Wattmeter答案：ABCD三、判斷題（每題2分，共10題）1.Voltageisthemeasureoftheflowofelectriccharge.(False)2.AcapacitorallowsDCcurrenttopassthrougheasily.(False)3.Inaparallelcircuit,thevoltageacrosseachcomponentisthesame.(True)4.Theresistanceofaconductordecreaseswithanincreaseintemperature.(False)5.Aninductorstoresenergyinamagneticfield.(True)6.Adiodeallowscurrenttoflowinbothdirections.(False)7.Thepowerfactorisalwaysequalto1inallelectricalsystems.(False)8.Astep-downtransformerincreasesthevoltage.(False)9.Electricalconductivityofamaterialisinverselyproportionaltoitsresistivity.(True)10.Anammeterisconnectedinparallelinanelectricalcircuit.(False)四、簡答題（每題5分，共4題）1.WhatisOhm'slaw?Answer:Ohm'slawstatesthatthecurrent(I)flowingthroughaconductorisdirectlyproportionaltothevoltage(V)acrossitandinverselyproportionaltotheresistance(R),expressedasI=V/R.2.Brieflyexplainthefunctionofatransformer.Answer:AtransformerisusedtochangethevoltagelevelinanACcircuit.Ithasaprimarycoilandasecondarycoil.Byvaryingthenumberofturnsinthecoils,itcanstep-up(increase)orstep-down(decrease)thevoltage.3.Whatistheroleofacapacitorinanelectricalcircuit?Answer:Acapacitorstoreselectricalcharge.ItcanalsoblockDCcurrentwhileallowingACcurrenttopass,andisusedinfiltering,couplingandenergystorageapplicationsincircuits.4.Nametwotypesofelectricalgenerators.Answer:TwotypesareDCgeneratorsandACgenerators.DCgeneratorsproducedirectcurrent,whileACgeneratorsproducealternatingcurrent.五、討論題（每題5分，共4題）1.Discusstheimportanceofelectricalgrounding.Answer:Electricalgroundingisimportantasitprovidesasafepathforfaultcurrentstoflowtotheearth.Ithelpsprotectpeoplefromelectricalshock,protectsequipmentfromdamageduetoovervoltage,andensurestheproperoperationofelectricalsystems.2.Explainhowtochoosetherightresistorforaparticularcircuit.Answer:Considerfactorsliketherequiredresistancevalue,powerrating(tohandlethecurrentwithoutoverheating),tolerance(accuracyoftheresistancevalue),andtheenvironmentalconditionsinwhichthecircuitwilloperate.3.WhataretheadvantagesanddisadvantagesofACandDCpower?Answer:ACcanbeeasilytransformedtodifferentvoltages.Itissuitableforlong-distancepowertransmission.DCisusedinsomeelectronicsforitsstablevoltage.Disadvantages:ACcanbemorecomplexinsomeapplications.DChashigherenergylossesinlong-distancetransmissionwithoutspeci