FAA考试题库General

05/23/2007Bank:(AviationMechanicGeneral)AirmanKnowledgeTestQuestionBankTheFAAcomputer-assistedtestingsystemissupportedbyaseriesofsupplementpublications.Thesepublications,availablethroughseveralaviationpublishers,includethegraphics,legends,andmapsthatareneededtosuccessfullyrespondtocertaintestitems.UsethefollowingURLtodownloadacompletelistofassociatedsupplementbooks:)equaltothemaximuminstantaneousvoltage.B)greaterthanthemaximuminstantaneousvoltage.C)lessthanthemaximuminstantaneousvoltage.2.A01GAMGThebasisfortransformeroperationintheuseofalternatingcurrentismutualA)inductance.B)capacitance.C)reactance.3.A01GAMG(RefertoGeneralfigure2.)Whatisthetotalcapacitanceofacircuitcontainingthreecapacitorsinparallelwithcapacitancesof.02microfarad,.05microfarad,and.10microfarad,respectively?A).170•F.B)0.125pF.C).0125•F.4.A01GAMGWheninductorsareconnectedinseriesinacircuit,thetotalinductanceis(wherethemagneticfieldsofeachinductordonotaffecttheothers)(Note:LT=L1+L2+L3...)A)lessthantheinductanceofthelowestratedinductor.B)equaltotheinductanceofthehighestratedinductor.C)equaltothesumoftheindividualinductances.5.A01GAMGTheamountofelectricityacapacitorcanstoreisdirectlyproportionaltotheA)distancebetweentheplatesandinverselyproportionaltotheplatearea.B)plateareaandisnotaffectedbythedistancebetweentheplates.C)plateareaandinverselyproportionaltothedistancebetweentheplates.6.A01GAMGTheoppositionofferedbyacoiltotheflowofalternatingcurrentiscalled(disregardresistance)A)impedance.B)reluctance.C)inductivereactance.7.A02GAMGHowmanyampereswilla28-voltgeneratorberequiredtosupplytoacircuitcontainingfivelampsinparallel,threeofwhichhavearesistanceof6ohmseachandtwoofwhichhavearesistanceof5ohmseach?A)1.11amperes.B)1ampere.C)25.23amperes.8.A02GAMGThepotentialdifferencebetweentwoconductorswhichareinsulatedfromeachotherismeasuredinA)volts.B)amperes.C)coulombs.9.A02GAMGWhichrequiresthemostelectricalpowerduringoperation?(Note:1horsepower=746watts)A)A12-voltmotorrequiring8amperes.B)Four30-wattlampsina12-voltparallelcircuit.C)Twolightsrequiring3ampereseachina24-voltparallelsystem.10.A02GAMGA24-voltsourceisrequiredtofurnish48wattstoaparallelcircuitconsistingoffourresistorsofequalvalue.Whatisthevoltagedropacrosseachresistor?A)12volts.B)6volts.C)24volts.11.A04GAMGWhichiscorrectconcerningaparallelcircuit?A)Totalresistancewillbesmallerthanthesmallestresistor.B)Totalresistancewilldecreasewhenoneoftheresistancesisremoved.C)Totalvoltagedropisthesameasthetotalresistance.12.A04GAMGTransferofelectricenergyfromonecircuittoanotherwithouttheaidofelectricalconnectionsA)iscalledinduction.B)iscalledcapacitance.C)cancauseexcessivearcingandheat,andasaresultispracticalforuseonlywithlowvoltages/amperages.13.A04GAMGThroughwhichmaterialwillmagneticlinesofforcepassthemostreadily?A)Copper.B)Iron.C)Aluminum.14.A04GAMG(RefertoGeneralfigure11.)FindthetotalcurrentflowinginthewirebetweenpointsCandD.A)6.0amperes.B)2.4amperes.C)3.0amperes.15.A04GAMG(RefertoGeneralfigure13.)Determinethetotalcurrentflowinthecircuit.A)0.2ampere.B)1.4amperes.C)0.8ampere.16.A04GAMGWhatunitisusedtoexpresselectricalpower?A)Volt.B)Watt.C)Ampere.17.A04GAMGWhatistheoperatingresistanceofa30-wattlightbulbdesignedfora28-voltsystem?A)1.07ohms.B)26ohms.C)0.93ohm.18.A04GAMGWhichiscorrectinreferencetoelectricalresistance?A)Twoelectricaldeviceswillhavethesamecombinedresistanceiftheyareconnectedinseriesastheywillhaveifconnectedinparallel.B)Ifoneofthreebulbsinaparallellightingcircuitisremoved,thetotalresistanceofthecircuitwillbecomegreater.C)Anelectricaldevicethathasahighresistancewillusemorepowerthanonewithalowresistancewiththesameappliedvoltage.19.A04GAMGA48-voltsourceisrequiredtofurnish192wattstoaparallelcircuitconsistingofthreeresistorsofequalvalue.Whatisthevalueofeachresistor?A)36ohms.B)4ohms.C)12ohms.20.A04GAMGThevoltagedropinacircuitofknownresistanceisdependentonA)thevoltageofthecircuit.B)onlytheresistanceoftheconductor,anddoesnotchangewithachangeineithervoltageoramperage.C)theamperageofthecircuit.21.A04GAMG(RefertoGeneralfigure11.)Findthevoltageacrossthe8-ohmresistor.A)8volts.B)20.4volts.C)24volts.22.A06GAMGAfullychargedleadacidbatterywillnotfreezeuntilextremelylowtemperaturesarereachedbecauseA)theacidisintheplates,therebyincreasingthespecificgravityofthesolution.B)mostoftheacidisinthesolution.C)increasedinternalresistancegeneratessufficientheattopreventfreezing.23.A06GAMGTheelectrolyteofanickelcadmiumbatteryishighestwhenthebatteryisA)inafullychargedcondition.B)inadischargedcondition.C)underano-loadcondition.24.A06GAMGThepurposeofprovidingaspaceunderneaththeplatesinaleadacidbattery'scellcontaineristoA)allowforconvectionflowoftheelectrolyteinordertoprovideforcoolingoftheplates.B)preventsedimentbuildupfromcontactingtheplatesandcausingashortcircuit.C)ensurethattheelectrolytequantityratiotothenumberofplatesandplateareaisadequate.25.A06GAMGInnickelcadmiumbatteries,ariseincelltemperatureA)causesanincreaseininternalre