electrical circuit - mcqs part i _ pinoybix - online questions and answers

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Electrical Circuit - MCQs Part I

ThisistheMultiplesChoiceQuestionsPart1oftheSeriesinElectricalCircuitasoneoftheElectronicsEngineeringtopic.InPreparationfortheECEBoardExammakesuretoexposeyourselfandfamiliarizeineachandeveryquestionscompiledheretakenfromvarioussourcesincludingbutnotlimitedtopastBoardExamQuestionsinElectronicsEngineeringfield,ElectronicsBooks,JournalsandotherElectronicsReferences.

Multiple Choice Questions Topic Outline

MCQsinACDCcircuits

MCQsinResistors

MCQsinInductors

MCQsinCapacitors

The SeriesFollowingisthelistofmultiplechoicequestionsinthisbrandnewseries:

ElectricalCircuitMCQs



PART1: Answerkey:MCQsfromNumber150 PARTI

PART2: Answerkey:MCQsfromNumber51100 PARTII

PART3: Answerkey:MCQsfromNumber101150 PARTIII

PART4: Answerkey:MCQsfromNumber151200 PARTIV

PART5: Answerkey:MCQsfromNumber201250 PARTV

PART6: Answerkey:MCQsfromNumber251300 PARTVI

Start with Part I of the [email protected]

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FreeUSGovernmentForms1.Conventionalflowassumeschargesflowfrom

A.Positivetonegative

B.Positivetopositive

C.Negativetopositive

D.Negativetonegative

2.Electronflowassumeschargesflowfrom

A.Negativetopositive



B.Negativetonegative

C.Positivetonegative

D.Positivetopositive

3.Seriesresonanceoccurswhen

A.X =XL C

B.X =RL

C.Z=R

D.BothAandC

4.ThesymbolQrefersto

A.Resonancequotient

B.Qualityfactor

C.Powerquotient

D.Qualificationtest

5.TheratioofW/VAinanaccircuitmeans

A.Powerfactor

B.Reactivefactor

C.Qualityfactor

D.Loadfactor

6.Whatisthereciprocalofqualityfactor?

A.Powerfactor

B.Reactivefactor

C.Dissipationfactor

D.1/Qfactor

7.Inliquidsandgases,ionizationcurrentresultsfromaflowof



A.Positiveornegativeions

B.Freeelectrons

C.Ionsthatarelighterinweightthanelectrons

D.Protons

8.V =V inaseriesRLCcircuitwhenL C

A.Thevalueoftheimpedanceisminimum

B.Thepowerfactoriszero

C.Thecurrentleadsthetotalvoltageby90

D.Thetotalvoltageiszero

9.Atwhatfrequencywillaninductorof5mHhavethesamereactanceasacapacitorof0.1F?

A.7.12kHz

B.7.12Hz

C.7.12MHz

D.7.12GHz

10.Propertyofanelectriccircuitthatdissipateselectricenergy

A.Reactance

B.Impedance

C.Resistance

D.Conductance

11.Whatistheothernameofrelativepermittivity?

A.Dielectricstrength

B.Potentialgradient

C.Breakdownvoltage

D.Specificinductancecapacity



12.InaseriesRLCcircuit

A.ThecurrentlagsV by90L

B.ThecurrentleadsV by90L

C.X leadsX by90L c

D.Z=jX atresonanceL

13.Resistorwithcoloredbandsinthebody

A.Wirewoundresistor

B.Carboncompositionresistor

C.Potentiometer

D.Rheostat

14.Inaresonantcircuit,ifQ10resonantfrequency_______bandwidth.

A.Bisects

B.Exceeds

C.Islessthan

D.Isequalto

15.WhichofthefollowingconditionsisnottrueforaseriesRLCcircuitatresonance?

A.Z=jXL

B.X =XL C

C.Thepowerfactorisone

D.ThemagnitudeofZis

16.Thecurrentis____timesthemaximumcurrentathalfpowerpointsofaresonancecurve.

A.0.707

B.1.414

C.0.5

D.0.632



17.Agangcapacitorisavariablecapacitorinwhichcapacitanceisvariedbychangingthe

A.Dielectric

B.Numberofplates

C.Platearea

D.Distancebetweenplates

18.Inanaccircuitwithinductivereactance,the

A.Phaseangleofthecircuitisalways45

B.Voltageacrosstheinductancemustbe90outofphasewiththeappliedvoltage

C.Currentthroughtheinductancelagsitsinducedvoltageby90

D.Currentthroughtheinductanceandvoltageacrossitare180outofphase

19.Ifthree9mHinductorsareconnectedinparallelwithoutmutualinductancethenthetotalinductanceis

A.3mH

B.9mH

C.27mH

D.18mH

20.Whatisthespecificresistanceofapuregermanium?

A.55cm

B.55m

C.55mm

D.55km

21.Twocapacitorsofcapacitance9Fand18Finserieswillhaveatotalcapacitanceof

A.27F

B.162F

C.6F



D.180F

22.InaseriesRLCcircuit

A.Increasingthefrequencydecreasestheresistance

B.Increasingthefrequencyincreasestheresistance

C.BothX andX changeasfrequencychangesL C

D.Impedancewillalwaysdecrease

23.AseriesRLCcircuithasa______powerfactoratitshalfpowerpoints

A.Unity

B.Leading

C.Lagging

D.EitherBorC

24.Kirchhoffslaws(KCLandKVL)areapplicableto

A.DCcircuits

B.ACcircuits

C.DCaswellasACcircuits

D.Passivenetworksalone

25.Atankcircuitisa

A.ParallelLCcircuit

B.SeriesLCcircuit

C.Aresonantcircuit

D.Anonresonantcircuit

26.Acapacitiveloadalwayshasa______powerfacto

A.Leading

B.Lagging



C.Zero

D.Unity

27.WhatisthetemperaturecoefficientoftheresistanceEureka?

A.Infinity

B.Negative

C.Almostzero

D.Positive

28.AsappliedtoaseriesRLCcircuit,bandwidthmeans

A.Thefrequencyrangeformaximumpowertransfer

B.Thedifferencebetweenthehighestandlowestfrequenciesoftheoscillator

C.Theseparationofthehalfpowerpoints

D.ThefrequencyatwhichX =XL C

29.Whichisconsideredastheeffectofadielectricmaterial?

A.Increasingcapacitance

B.Decreasingcapacitance

C.Reducingtheworkingvoltage

D.Increasingthedistancebetweentheplates

30.TheopencircuitvoltageattheterminalofloadR is60V.Undertheconditionofmaximumpowertransfer,theloadvoltagewillbe

L

A.60V

B.15V

C.20V

D.30V

31.Ifacapacitorisratedfor200Vdc,whatisitseffectiveacworkingvoltage?

A.50V



B.100V

C.200V

D.400V

32.Ifresonantfrequencyis10kHzandqualityfactoris50,then

A.Bandwidthis200Hz

B.X =is50,000L

C.Ris50

D.X =is50,000C

33.Whichstatementistrue?

A.Aseriesresonantcircuitisofhighimpedance

B.Aparallelresonantcircuitisoflowimpedance

C.Aseriesresonantcircuitisinductiveifitoperatesatafrequencyhigherthantheresonantfrequency

D.Aparallelresonantcircuitisinductiveifitoperatesatafrequencyhigherthantheresonantfrequency

34.Whatisconsideredasthemostimportantvalueofasinewave?

A.Effectivevalue

B.Peakvalue

C.Averagevalue

D.Instantaneousvalue

35.Anacseriescircuitiscomposedofaresistanceof20,inductivereactanceof40,andacapacitivereactanceof15.Ifacurrentof1ampereisflowing,whatistheappliedvoltage

A.320V

B.32V

C.220V

D.22V



36. An intermittent and nonsymmetrical alternating current like that obtained from the secondary winding of aninductioncoil

A.Faradiccurrent

B.Transientaccurrent

C.Inductivecurrent

D.Capacitivecurrent

37.Thevalueoftemperaturecoefficient()isdependentupon

A.Thenatureofmaterialandtemperature

B.Thelengthofmaterial

C.Thecrosssectionalareaofthematerial

D.Thevolumeofthematerial

38.AtwhatfrequencywillthecurrentinaseriesRLCcircuitreachitsmaximumvalueforanappliedvoltageof15VwithR=500,L=100HandC=0.001F?

A.503kHz

B.403kHz

C.603kHz

D.303kHz

39.Iftwoequalresistancesconnectedinseriesacrossacertainsupplyarenowconnectedinparallelacrossthesamesupply,thepowerproducedwillbe_____thatofseriesconnection

A.Onehalf

B.Onefourth

C.Twotimes

D.Fourtimes

40.Thevoltagelagsthecurrentbycycleina

A.Purelyresistivecircuit

B.Purelyinductivecircuit



C.Purelycapacitivecircuit

D.Circuitcontainingresistance,capacitanceandinductance

41.Whatisthehalfpowerbandwidthofaparallelresonantcircuitwhichhasaresonantfrequencyof3.6MHzandQof218?

A.1.65kHz

B.16.5MHz

C.16.5kHz

D.165kHz

42.Whichoneofthefollowingelementsservesasaprotectionagainstoverload?

A.Fuse

B.Switch

C.Resistor

D.Relay

43.Transientperiodisconsideredoverafter

A. 5

B.1

C.100

D.6

44.Whatratingofaresistordeterminesitsabilitytoabsorbheat?

A.Wattage

B.Ohmic

C.Current

D.Voltage

45.Anopeninductorhas

A.Zeroresistanceandinfiniteinductance



B.Infiniteresistanceandzeroinductance

C.Infiniteresistanceandinfiniteinductance

D.Zeroresistanceandzeroinductance

46.Whatisthereadingofanohmmeterforashortedcapacitor?

A.Zero

B.Infinity

C.k

D.M

47.What capacitanceexistsnot throughdesignbut simplybecause two conducting surfacesare relatively close toeachother?

A.Surge

B.Stray

C.Natural

D.Normal

48.Theaveragevalueofatriangularorsawtoothwaveis_____timesitspeakvalue.

A.0.577

B.0.500

C.0.318

D.0.637

49.AseriesRLCcircuitconsistsofa10resistorinserieswithL=10H,andC=100F.DetermineanewvalueofI,forwhichtheresonantfrequencyisonehalftheoriginalvalue.

A.40H

B.40mH

C.40pH

D.40nH



50.Whatisthepeakfactorofatriangularwave?

A.1.16

B.1.73

C.1.41

D.1.11

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