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DIFFICULTYLEVEL TOPICREPORTSolutionReportForANALOGELECTRONICSRepresentwholetestsolutionwithcorrectandincorrectanswers.

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Q.No

QuestionStatus

Q.1

Attempt Incorrect YourAns. d CorrectAns. b Solution

Which configuration of the transistor is used as an impedancetransformer?

a. Commonbaseb. Commoncollectorc. Commonemitter

d. Cascadeconnection

Q.2

Attempt Incorrect YourAns. a CorrectAns. c Solution

ThemaximumefficiencyofclassAamplifiercanbe

a. 25%

b. 24.7%c. 50%d. 32%

Q.3 Inthefigureshown

REPORTS

NEWS



Attempt Incorrect YourAns. d CorrectAns. b Solution

Assume that the transistors are identical and their respectivetransconductanceisgm,thenthenettransconductancewillbeequalto

a. gm/2

b. 2gmc. (gm)2

d. Noneoftheabove

Q.4 Inthefigureshownbelow

AssumingtheopamptobeanidealopampandVin=Vmsin(0t) then

theoutputofthesystemwillbe

a.

b.

c.

d.



Attempt Incorrect YourAns. a CorrectAns. b Solution

Q.5 GivenaperiodicsquarewaveofperiodTasaninputtothecircuitshownbelow

LetT>>RCthentheoutputoftheabovecircuitwillbe

a.

b.

c.



NotAttempt CorrectAns. c Solution

d.

Q.6


Inthefigureshownbelowthediodesareideal

theoutputofthecircuitwhenVA=5V,VB=3V,andVC=1Vwillbe

a. 3Vb. 0Vc. 5Vd. 1V

Q.7

Attempt Incorrect YourAns. d CorrectAns. a

InapracticalRCphaseshiftoscillator(i)Thephaseshiftprovidedbytheoscillatorsamplifiershouldbe180.(ii)ThevalueofRandCinthecircuitshouldbesameforallthecapacitorsandresistorsinvolved.

(iii)Thevalueofgainoftheamplifier shouldbeequaltoinverseofthemodulusofthefeedbackfactor.Which of the above conditions are necessary for the RC phase shiftoscillatorwith3capacitorfeedbackcircuits?

a. (i)onlyb. (iii)onlyc. (i)and(iii)

d. (i),(i)and(iii)



Solution

Q.8

Attempt Correct CorrectAns. b Solution

Theconditionforthermalrunawayis

a. Theheatgeneratedatthecollectorislessthanrateofheatdissipatedbyit.b. Rateofheatgeneratedatthecollectorshouldbegreaterthanrateof

heatdissipatedbyit.c. Rateofheatdissipatedbythecollectorisgreaterthentherateofheat

generatedatthecollector.d. Noneoftheabove.

Q.9


Inthecircuitshownbelowtheopampisideal.

thegainoftheabovecircuitis

a. 1b. 2c. 0.5d. 5

Q.10 ConsidertheCMOSinverter

Thefiguregivenbelowisthetransfercharacteristicofthecircuit




Wehavedividedtheplotin5regionsaccordingtooperationofNMOSandPMOSoftheCMOScircuit.TheregionwhereCMOSinvertercanbeusedforamplificationpurposewillbe

a. 1b. 3c. 2d. 4

Q.11

Attempt Incorrect YourAns. d CorrectAns. a Solution

Inthefigureshownbelow.

IfRA=RBthen

a. Dutycycleoftheoutputwaveisgreaterthan50%.b. Dutycycleoftheoutputwaveis50%.c. RAandRBdonotinfluencethedutycycleoftheoutput.

d. Dutycycleis50%irrespectiveofRAandRBvalues.

Q.12 Three identical RC coupled transistor amplifier are cascaded. If eachamplifier has an upper cut off frequency at 10 kHz then the cutofffrequencyofoverallsystemwillbe_____kHz.



Attempt Incorrect YourAns. 3.35 CorrectAns. 5(4.80to5.30)Solution

Q.13

Attempt Correct CorrectAns. 2 Solution

ConsideraHalfwaverectifiercircuitwitha500loadoperatingfrom220V(rms)supply.IfthediodeshaveforwardresistanceRfequalto10,then

theregulationis_____%.

Q.14

NotAttempt CorrectAns. 0.60(0.50to0.70) Solution

Considerthecircuitshownbelow

Assume that transistor tobe insaturation regionandVBE(sat) = 0.8V,

VCE(sat)=0.2Vand=100,thecurrentiis_____mA.

Q.15

Attempt Correct CorrectAns. 1(0.90to1.10) Solution

Inthevoltageregulatorcircuitshownbelow

given that iz(min) = 0.6mA, then themaximum value of load current is

_____mA.

Q.16 Considerthecircuitgivenbelow,



Attempt Incorrect YourAns. 20 CorrectAns. 30(29.50to30.50)Solution

Assumethattheinputvoltageis2VandVtoftheNMOStransistoris1V

anddropacrosstheLEDis1VthenthecurrentflowingthroughtheLEDwhentheMOSFETisattheedgeofsaturationis_____mA.

Q.17

NotAttempt CorrectAns. b Solution

Inthefigureshownbelow,

Assume =1k,theinputresistanceofthecircuitis

a. 5.152kb. 5.203Mc. 5.151Md. 421k

Q.18 Considerthecircuitshowninthefigure,




theopamp is idealwith thegainbandwidthproductequal to50kHz.Tohave faithful reproductionof thesignalVmsin(31.416t ) at theoutput, the

minimumvalueofR1is_____.(AssumeR2=5k)

a. 5kb. 0.5c. 1kd. 10k

Q.19


Considerthecircuitgivenbelow,

Assumingall thecapacitorsareshortcircuitedatmid frequency.Theapproximategainofthefeedbackamplifierwillbe

a. 100

b. 103

c. 3d. 56.69



Q.20

NotAttempt CorrectAns. b Solution

Considerthecircuitshownbelow,

Iftheinputofthesignalis10sin0tthentheoutputofthesignalwillbe

a.

b.

c.

d.

Q.21



Attempt Correct CorrectAns. c Solution

InthefiguregivenbelowAssumingopenloopgainofopampisAOL=5

103

If theopen loopgainofopampdecreasesby20%, then theclosed loopgaindecreasesby

a. 0.8%b. 1.5%c. 0.39%d. 1%

Q.22

Attempt Correct CorrectAns. a Solution

The three interacting stages of amplifier have been cascaded and thetransferfunctionofoverallsystemisgivenas

then the approximate value of the upper cut off frequency of overallsystem.(wherefisinHz)

a. 467kHzb. 51kHzc. 5.68MHzd. 1.12MHz

Q.23 Considerthecircuitgivenbelow,



NotAttempt CorrectAns. a Solution

AssumeboththeNMOSareidenticalwithnCoxWL=20mA/VandVt=

0.5VthenthevalueofVoutis

a. 2.132b. 1.143c. 1.890d. 2.432

Q.24 ConsidertheMOSFETcircuitshowninthefigurebelow,thecircuitisbiasedsuch that MOSFET is in saturation and the drop across the MOSFET isnearlyequaltozero.

Thenthevalueofitoreachthegivenconditionwouldbe

a. 2mA



Attempt Incorrect YourAns. b CorrectAns. a Solution

b. 1mA

c. 3mAd. 8mA

Q.25 ConsidertheNMOSshowninthefigure.

Which of the following curve represent expected dependence ofgm(transconductance)onVGS(Gatesourcevoltage)

a.

b.

c.



Attempt Incorrect YourAns. b CorrectAns. c Solution

d.

Q.26

Attempt Correct CorrectAns. d Solution

Considerthefigureshownbelow,

Theabovefilterwillworkas

a. Highpassfilter.b. Bandstopfilter.c. EitherhighpassorlowpassdependinguponthevalueofR1,R2,C1,C2.

d. EitherbandpassoranattenuatordependinguponR1,C1,R2,C2value.

Q.27 Thefigureshownbelowrepresentsaschmitttrigger



Attempt Incorrect YourAns. d CorrectAns. a Solution

Thenthewidthofthehysteresisloopwillbe

a. 12Vb. 8Vc. 13V

d. 10V

Q.28

Attempt Correct CorrectAns. 3.87(3.50to4.00) Solution

GivenaJFETwith =2VandthemaximumdraincurrentIDSSequalto

5 mA. If we want to operate the JFET at 3 mA then the value oftransconductancewillbe_____mA/V?

Q.29


SupposetwoAmplifiersarecascadedasshownbelow

IfRS = 1 k then to supply maximum power to the load RL the output

resistanceofanamplifiershouldbe_____k.(Assumebothamplifiertobeidenticalandinputresistanceofeachamplifierbe1k)

Q.30 If the input to thecircuitgivenbelow is10sin0t then theoutput to the

circuitwillbe_____V.




Q.31

Attempt Incorrect YourAns. 1 CorrectAns. 3 Solution

Inthefigureshownbelow,

Themagnitudeofgaini.e. is_____?

Q.32 Considertheamplifiercircuitshownbelow,

Assume that the current gainof the transistor is very large, then themodulusofthevoltagegainoftheamplifieris_______.



Attempt Incorrect YourAns. 816.74 CorrectAns. 5(4.50to5.50)Solution

Q.33

Attempt Incorrect YourAns. 0.8 CorrectAns. 0.20(0.15to0.25)Solution

Assumethatthediodeinthecircuitisideal,thenthevalueofIinthecircuitis_____mA.

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