Unit 19 Capacitors - Electrical Block Practice

Name: Class: Date: Unit19Capacitors Indicatewhetherthestatementistrueorfalse. 1.Whilethefaradisthebasicunitofcapacitance,itisseldomusedbecauseitisanextremelylargeamountof capacitance. a.True b.False 2.TemperaturecoefficientsarelistedinpartspermillionperdegreeCelsius. a.True b.False Indicatetheanswerchoicethatbestcompletesthestatementoranswersthequestion. 3.Variablecapacitorsnormallyhaveadielectricof_____. a.air b.mica c.Teflon d.glass 4.Achargecurveforacapacitorisdividedinto_____timeconstants. a.two b.three c.four d.five 5.IntheformulaQ=CxV,whatdoesQstandfor? a.capacitanceinfarads b.chargeincoulombs c.chargingvoltage d.capacitanceinpicofarads 6.A100μFcapacitoranda3.6kΩresistorareconnectedinseries.Howlongwillittakeforthecapacitorto changeitschargecompletely? a.1.8s b.2.3s c.3.8s d.4.3s 7.Inacapacitor,theamountofdielectricstressisproportionaltothe_____. a.distancebetweentheplates b.thicknessofthedielectric c.currentflowthroughthecapacitor d.voltagedifferencebetweentheplates Name: Class: Date: Unit19Capacitors 8.Whatisadevicethatopposesachangeofvoltage? a.aninductor b.acapacitor c.adiode 9.AHIPOTisatestsetusedtotestcapacitor_____. a.capacitance b.dielectric c.leads d.tolerance 10.Thematerialbetweenacapacitor’splatesisratedbyavaluecalledthe_____. a.dielectricconstant b.magneticconstant c.dielectricvariable d.magneticvariable 11.Variablecapacitorsgenerallycontaina(n)_______________. a.ACelectrolytic b.dry-typeelectrolytic c.setofcharges d.setofmovableplates 12.Energyinacapacitorisstoredasa(n)_____. a.electrostaticcharge b.magneticfield c.electromagneticfield d.circulatingcurrent 13.Atemperaturecoefficientthatis__________indicatesthecapacitorwillincreaseitscapacitancewithan increaseintemperature. a.negative b.positive c.neutral d.stable 14.Threecapacitors,a12μF,a20μFanda30μF,areconnectedinseries.Whatisthetotalcapacitance? a.6μF b.62μF Name: Class: Date: Unit19Capacitors 15.Howaresmallelectrolyticcapacitorsgenerallytestedforshorts? a.withanohmmeter b.withavariableDCpowersupply c.withamicroammeter d.withaHIPOT 16.Acapacitorisconstructedbyseparatingtwometalconductorsknownas_____withaninsulatingmaterial knownasa(n)_____. a.plates;dielectric b.dielectrics;plate c.electrolytes;ceramic d.ceramics;electrolyte 17.Increasingthesurfaceareaoftheplateswillcausethecapacitanceofacapacitorto_____. a.decrease b.increase c.staythesame 18.Capacitorschargeanddischargeata(n)_____rate. a.linear b.exponential c.geometric d.sinusoidal 19.Twocapacitors,a20μFanda30μF,areconnectedinseries.Whatisthetotalcapacitance? a.12μF b.50μF 20.Inacapacitor,thevoltagedifferencebetweentheplatescontrolsthe_____. a.areaoftheplates b.thicknessofthedielectric c.amountofdielectricstress d.amountofcurrentflowthroughthecapacitor 21.Whatisthebasicunitofcapacitance? a.henry b.farad c.ohm d.coulomb Name: Class: Date: Unit19Capacitors 22.Whatlettersymbolizesthefarad? a.C b.Q c.F d.V 23.Insomecapacitors,thereisasmallamountofcurrentthatflowsfromoneplate,throughthedielectricmaterialto theotherplate.Thiscurrentiscalled_____current. a.leakage b.conduction c.electrostatic d.electrolytic 24.Threecapacitors,a12μF,a20μFanda30μF,areconnectedinparallel.Whatisthetotalcapacitance? a.6μF b.62μF 25.Twocapacitors,a20μFanda30μF,areconnectedinparallel.Whatisthetotalcapacitance? a.12μF b.50μF 26.Whenacapacitorisconnectedinacircuitwitharesistor,theamountoftimeneededtochargethecapacitoris calledthe_____. a.CRtimeconstant b.RCtimeconstant c.CRtimevariable d.RCtimevariable 27.Nonpolarizedcapacitors_____. a.mustbeusedwithAConly b.mustbeusedwithDConly c.canbeusedwitheitherACorDC 28.Polarizedcapacitors_____. a.mustbeusedwithAConly b.mustbeusedwithDConly c.canbeusedwitheitherACorDC 29.Polarizedcapacitorsarealsoknownas_____capacitors. a.bipolar b.variable c.electrolytic d.electroplated Name: Class: Date: Unit19Capacitors 30.Whichareusedforpowerfactorcorrectioninindustrialapplications? a.coulombs b.farads c.capacitors d.watts 31.Whatdictatesthetypeofcapacitorused? a.circuitvoltage b.circuitmagnitude c.circuitstrength d.circuitapplication 32.___________capacitorsareconstructedinsuchamannerthattheircapacitancevaluecanbechangedovera certainrange. a.Nonpolarized b.Polarized c.Variable d.Ceramic 33.Atemperaturecoefficientthatis__________indicatesthecapacitorwilldecreaseitscapacitancewitha decreaseintemperature. a.negative b.positive c.neutral d.stable 34.HowmanymeasurementsmustbemadeforaccuracytotestlargeACoil-filledcapacitors? a.one b.two c.three d.four Indicatewhetherthestatementistrueorfalse. 35.Capacitorsareusedextensivelyinelectroniccircuitsforcontroloffrequencyandpulsegeneration. a.True b.False Name: Unit19Capacitors AnswerKey 1.True 2.True 3.a 4.d 5.b 6.a 7.d 8.b 9.b 10.a 11.d 12.a 13.b 14.a 15.a 16.a 17.b 18.b 19.a 20.c 21.b 22.c 23.a 24.b 25.b 26.b Class: Date: Name: Unit19Capacitors 27.c 28.b 29.c 30.c 31.d 32.c 33.a 34.b 35.True Class: Date: