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j Exa~'-·----04 TRIBHUVAN UNIVERSITY

INSTITUTE OF ENGINEERING rL~-;cl---"--

i------- 1All (Except -'-~ P M ks : 32 'I'Examination Control Division I p rogramme: BAh) . I ass arL I . rc.. I I

2071 Bhadra i Year/Part j II II i' Time --1il...- " ,3 hrs.

___, S_Ll_b~'.i_ec_t_:_-Basic Electronics Engineering (EX451)

-/ Candidates are required to give their answers in-their own words as far as practicable. -/ AttemptAll questions. ./ The figures in the margin indicate Full illarks. -/ Assume suitable data ifnecessary.

1. Define active and passive circuit component. Determine the color code of the following resistor 75 KQ ± 10%. [2+2]

2. Determine the currerit through 10 Q resistance using Thevenin's theorem. [4]

: BE ! Full Marks i 80 !

...: .

3. What is a filter? Explain the types offilter with necessary diagrams. [1+3]

4. Explain large signal models ofPN junction diode. .[~]! 5. Define clIpping circuits. Draw the output waveform of circuit shown below. Assume real ! silicon diode. ' [2-1;f] ,I

I"i !

J ,

, ,

+,

+ RL = 1 KQI.I

II )~

6. Find the Zener current in the given circuit when RL = 1.2KQ. Assume Vz = 10 V. ,[4]

" 7. Explain the common ernltte~ configuration circuit of npn tra.'1sistor with the help of input

'1/I, and omput characteristics. [6] I

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8. ExplaLTl t.~e working principle of 1\ channel depletion type MOSFET with necessary diagrams. [6]

9. State any four properties of arl ideal op-amp. Design a SUI!ill'Jng amplifier usign Op-Amp to ge- the output voltage Yo = -V, + 2V2 ..J.. 3V). (2-'-3]

10. Explain how squar~ve caIl be-generated using Op-Amp and wTite the relation for -­frequency of oscillation. [4+1]

-=-­11. Define communication system and draw the complete block diagram of cOffiffiUllication

system. [2+3]

12. What is optical fiber? Explain the advantages of optical fiber communication over traditional communication system. [2+3J

13. Simpiify the expression using K-map, Y = A'BC' + ABC' + ABC. [3]

14. Explain the operation ofSR-flip flop with necessary diagrams and characteristics table. [6]

15. (a) (10101.101)2 = (?)1O (b) (900i I80}IO = (?)BCD (c) (2AB . 5E)16 = (?)g [Ix3]

16. What is instrumentation system? Explain the instrumentation system with the help of simple block diagram. '(1+3]

17. Write short notes of any two: [2x4]

a) Data Logger b) DMM c) Strain Gauge

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i-:E~fi;~-------04 TRIBHUVAN UNIVERSITY r---- ­

INSTITUTE OF ENGn~EERING ! Level ~:B=.=E:- .....:.{..:;F:....:u=l:..lM~a:..:..r~ks=-- _ ; 1> : Ali Except ;

Examination Control Division i Pass Marks 32t. rogramme (B.A.rch.)

2071 Magh : Year / Part ! un Time 3 h15.--------------'

Subject: - Basic Electroni,?s Engineering (EX_4_5....:.1)_' '

.,I Candidates are required to give tIl,err answers in their own words as far as practicable.

.,I AttemptAll queslions.

.; The figures in the margin indicate Full Marks.

.,I Assume suiIaole data ifnecessary.

! .1 ~. Wha~ do you mean by filter? Explain the RC low pass and high pass filter withI 1 corresponding transfer function and magnitude. [1+4]1\ (0

2. State Thevenin's Theorem. Write down the steps 'for determining Vth and Rth with [1 +4] j/ necessary circuit diagrams.

j 3 .. \Vhat is rectification? Explain the operation of half wave rectifier with necessary diagrams. [1+4]

4. What are clippers? Draw the sinusoidal waveform of the following. circuit and indicate _the output voltage. Assume diode is ideal. [1+4]

R .---'\)JJw---.""-1"-'--.....,~ +

+IVBias __- ­

T I: 5. Find the zener current from the given zener diode network when RL 3 KQ and 'I [5],Vo = lOY.I

R=l KQ

'I I

! Vi = 16 V

6. For the given circuit with f3 = 75, dete::mine Is, Ic and VCEo [2+2+2]

RB =200 KQ

=

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II 7. Explain the construction and working principle of enhancement type MOSFET? [6]

8. Explain the concept of feedback theory. Describe the working principal of square wave oscillator circuiI using op-amp. [2-r4]

9. State a..'ly 4 important propenies of ideal Op-Amp. Draw the circuit diagram of differentiarof using Op-Amp and show that output is the differentiation of input signa~. [~J

10. What is modulation? Explain AM and FM modulated wave. [1-2+2J

11. What do you mean by electromagnetic waves? How are they propagated? Explain. [2+3]

12. Perform the followinQ: [4xl]-af' (375.37)8:= (?)16

~

b) (169.03125)10:= (?)2 c) (905)io = (?)BCD d) Subtract (25)10 from (49)10 using 2'S complement method

13. Simplify the following Boolean expression using K-map and realize it by using universal gate of your interest. . [3+2]

F(x, y, z) = xy + xz + yi

14. Explain SR flip-flop with circuit. [4]

15. What is instrumentation system? Describe the instrumentation system with block ~~ ~

16. Explain briefly about remote control or digital multimeter with necessary diagrams. [4]

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0,;

IN"STT:"-"TE OF ENGIN1:ER.:.'NG ! Leve!

.-.

BE!-----.--7---=:----'------i----'

Examination Cont:-ol Division i Pro~mlmme All (Expect IPass Marks 32 I i _~ -:-..:::B=.;•.:.....A.r=....:.:ch:..::.:.!..)__-,-'-------+-:-:---1

2070 Bhadra Ll:ear i Part I I n I Time 3 hrs. !

Subject: - Basic Electronics Engineering (EX451)·

../ Candidates are required to give their answers in their own words as far as practicable.

./' Attempt All questions. .,/ The figures in the margin indicate Full Marks.

• .,/ Assume suitable daw ifnecessary.

1. State superposition theorem. In the following figure frnd the current flow in 4 ohm resistor using superposition theorem. . - . [2+4].

_ l2V 4,Q

14VS.ot_---J""-3-,Q-_______

2. Explain the principle of operation of RC low pass filter with neceSSaI"j diagrams and derivation. [4J

3.' Explain the working principle of full wave bridge rectifier circuit with the help of necessa..J' circllir diagrams and expressions. . [6]

".. -..; '"!"'~.' rOt:· .• '; ; ".4. Determine VLi

;

IL, 1z and IR f<;>r the- network shown in figure below for follo\Ving condition. [3+3J

a) IfRL = fso n b) IfRL = 470 n

• Rs = 220.0 )

+-Yin = 20V

Vz = lOY PZ max = 400 rnW

5. Define DC lead line? Explain the -coomon emitter configu.ration circuit with the help of _input and output characteristics curve. [2+4J

6. Ex~laLT} the constru_cqoJ?- and working principleofMOSFET. [oj

7.--w;jie:the foUI' prouerties of ideal operation2--..:u-TIolifier. [2+4] --'-" -." -. .... .... - '! .~

8. _Explain how square wave can be generated using Op-A~p. [6] '--'-- ­

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9. Den..lle c:JrnmW1ication 5; seem. 2::Qla.i= a.'TIDli!ll~e moculation corr..munication s:-,sIer:2 with the help ofnecessar'"j block diagrams. [OJ

10. Discuss the r::>le o.c amen.."12. in cOInmU1.J.icanon system. 'What are the advi!mages 8..-rQ disadvantages of optical iibe, cornrnunicarion? r-J...:...d ]L- '"T

11. Draw the circuit of X-OR gate using NAND gates only. Perform ul.e subtraction using 2'5 comple:nen· method.. r'i...:..'J]

L- ­

42(10) -115(10)

12. Simplifj L.1.e expression using k-map [4] F(x, y, z) = xyz + x'y'z + xyz' -i- X/y'Z/ + x/yz

13. Discuss the operation of S-R flip flop.­ . [4] 14. Write short notes: (anv two)

J , [5x2] a) Clipper circuit b) Strain gauge transducer c} Data logger.

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04 TRlBHT..JV..i.N U1-i:T /E?.SrIT

INSTITU 1.e OF B-TGlNEEPlNG I Ali (Ex::ept .Examination Cont~ol Dhision Programme I B A_ ' ') IPass Ma.i""-s. 32I ..-ucn

2070 Magh Ye3rfPart ! I fII ~ Time J - ,nrs.

Subject: - Basic Electronics Engmeerl.c'1g (LY45jj

-/ Candidates are required to give their ansWers in t1eir own words as far as practicable. y/ AttemptAll questions. "" ./ The figures in the margin indicate Fu.ll AtIarks. -/ Assume suitable data ifnecessary.

1. Find the current I in 150 .Q resistor using thevinius the"orem. {6] " . 00 Q 60 Q

IODV lSOQC -. [2]2. Find the value of resistor from following colour code.

a) Red Orange Green Silver b) Yellow Black Gold Gold

3. Explain the operation of RC high pass filter circuit with the help of necessary di~orams

and figures. [4J

4. Describe N ~haracterisi:ics ofPN Junction diode. [6J

5. What is a damper circuit? Design a clamper circuit to perform the function indicated in the figure below. " ". [2+4] .

)>

t

++20

-20v

Vin

•

J"

6. For the given circuit with f3=7?, Determine VBE, IB , ,.Icand V CEo [6] Vee = +12V

r Rc=2.21<..'2

RB=200 k B C

E I

-L

7_ --:.~.- .,.;::::~ -'

Explain how 3JT Carl" be used as as·,vitch. \\!hat are t..1-:le difference bet-y-.,;een MOSFET and BJT?-" . [ "+'">.1-:­ '::'J

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8. Explain:he concept of vi:-t'..lal ground in op-amp. Desi~ a SUIDJ.'"TI.er drcuirusing op-am;; to ge: 6e OutiJUI voltage as: '10 = _0,VJ +1OV~ T 25V.)

- - - ~ J

9, How 'cio you define positive feedback? Draw the circuiT for Wein bridge oscillator ana explain the pri..nciple of operation.

10, What are the .ad.vantages of optical fiber communication sysrem? Draw and label tile diagram of optical fiber.

11. Explain why modulation is needed in Communication System. Mention any three . parameters of antenna. r", ,'"'].JI,;)

12: Simply the given function using K-map metL1od. F(A, B,C)=I (0, 1, 2,5) + D (3,4, '6) and implement the simplified cireui! using N.AND only. f3+31

13. What is the difference between combinational and sequential circuit Discuss Tl'C flin-fion. .. ..... .. with the help of logic diagram. . .[2+6]

14. Write short nOtes on: (any two) [3x2]

a) Data logger . . b) Regulated poWer supply c) Digital Multi-meter

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04 TR.t3h"VYA...": Lrl',r;:V=::::.s~{ i Exzm. ltC;<?!t\s:t:tDiiBftM:M!!lf\"f.!l INSTITTJ'l'E OF ENGDi.=,:=;PING iLevel : BE; i Full Marks ! 80 i

-.::i' .. ,# ~ .... -: lit..,:J.:JXamlnanOn Controi DIVISIOn .1 Programme IAll {Except !O.A:'ch) i Pass Marks !.:>2 1 , , .

2069 Bhadra . i Yeur / P~rt) II IT I Time I 3 hrs, . \

Subject: - Basic Electronics Engineering (EX451)

./ Candidates are required to give their ariswers in their own words as far as practicable.

./ Attempt All questions.. '. .

./' Thejigures in the margin indicateFuO Marks. ./' Assume suitable data. ifnecessary.

. i , '1. ;Def.ine transconductance and voltage gam with reference to BJT. [3] i

1

2. Dr~~RC highpa~s filter circuit and its characteristics ~aph.. [2J - -,;,,,!. --' •.• ,-. "

'3. F~d ~urrent flow in 3.0 resistance. Use s?,perposition theorem to solve the problem. [5]

3.0 ,

, .. [1+3J' ,I

4...

What is clamping circuit? Find the output waveform of the kiven circuit. V~ 'C' ...j,. ,.' .-~--l ~--+---~'-­+25V , ~

"

;~+

Vo~t

.1:

, ' ,, ,J

. .

5. Deduce AC resistance ofPNjunction diode at forvlard biased region:.' [3] )6. Draw bridge rectifier circuit and its ~utput waveform. Assume input is Sinewave voltage. [3]

7. ,Find Iz, assuming Vz = 9V. [3]

, . j,

Vir, =

,

p=120n .' .4rI. Z

'VoutI5V-=- ..

.

8. Find the v,olume of collector: current; Q-point, DC load line for cOIDmon emitter .circuit having Vc.':. =.l~V, Rc = lOKn,-IB = lOJ-lA and 13 = 50 . . ~ : . '. .. - [5]

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9. Draw tile -cireui. diagram a.TJ.d I-V charact~ristic cu..-ve to inveS'".igate OUTIn:: stan: cha.'"acteristics 0: common emitter amplifier configuration.

i 10. Describe the operation of CMOS NOT-gate circui~.

I­ 11. State four' impor..ant prope:'ties 'ofideal op-amp. Draw the, circuit diagram of aI differentIator using op-amp and show that the OI.!lPU~ is the derivative of the input. f .12. Describe the operation of Wien bridge RC-sinewave·Oscillator. State Barkhausen"criteria. r

13. Draw the block diagram of cOI11I!lUnication'system and explain each block.t 14. DefIne amplitude rnedulation and frequency modu1?-tion and draw the necessaryf

wavefonns. . . f' 15. State DeMorgan'st.~eorems withexample in each cas~.f

16. a) Verify the following: .f - ­

I i) AB+AC = (A+C) (A+B) ii)XY+ XZ+YZ=XY+XZ

b) Find: (l5)lo--{20)lO=?, use 2's complement method.

I 17. Draw and explain the block diagram of data logger and remote control.

18. Define encoder. Draw truth tables of NAND and XOR gates.

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.[4]

[7+41 [4+21

[4]

[2+3]

[4]

[2+2J

'[2]

[5+5]

[2+2] .­

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04 T;']3E-:U·V.4j'i L.l'iI'/ERSIT:' iExu~-.-------,-- New Back l2066 &. Later Batch)

INSTITl.-T£ OF ENGlNEER.l'NG .rL-;;~~i-' : BE ---, I Fun Marks I 80__,__, IT7' ' ''''; C 1 D' .. ! p j All {2xcem I P M 1 3'2-- - III',:Ji.·.:xamlna llon on tT01 lYlSlOn i rogramm e 1 B A _ h)' ,I ass arfiS I

L-.-.. f ,.'"'1../.C

2069 Poush LYea.: /Parr 11 /n i Time j 3 hrs·l .. . ~-:

Subjed: - Basic Electronics EngineerinQ: (EX451) . rf .•

.,/'. Candidates are reauired to irive their answers in their own words as far as practicable.

.,/' AttemptA:J questi~ns. -.' . '.' ­v'. Thefigures in the marginindi.;ate FulilWarks. ./ . Assume suitable data ifnecessary.

1. Find the current I in R3 using:- Thevenin'stheo~em. .. [4] . <•

• ,... _0'

60Q

~I

1500

i

.2~ Draw the circuit diagram'of RC Low 'Pass 'Filter and explain with the help of frequency . . depe?dent response of the output~'. . .', ..' .. ' '-. , : ' .' . [4]

_3..c:~ wliat:"isdiode? Explam'fue I~V charact~~~tics of.PN junction diode, . . [6] _ .- .:._., •• ..,Y.< '. ' • • • ' •• . ~

[6]'. 4, .' Explain the 'Y'(0rking principle of full-wave bridge rectifier circuit. .

.. . t' . S. . 'What is dc load line curve? Explain the common emitter configuration circuit with the f.-.

· . help' ofinput anq qutput characteristic curve,-- [1+5] ~ • .1' .i~: :. . - - . ~~

6. 'Explain the construction,and working principle ofMOSFET. . [6] .'. ~ F

. . 7::-":Stat~Jo~'iri:lport~i~roperties of ideal operational amplifier. 'Draw the circuit di~am of

. _,an mtegrator using op-amp and show that'output is tJ:te integration of input signaL.. [2+4] ;;

._ 8. .~xplamthe working principle of sqU:are wave oscillator circuit usmg op-,amp.... ~ .. - ~

... 9:~' Defin~ ~ommUnication system. Discuss 'about the merits'bf opticalfibercornmunicatibn ,,;;. '­" . 'oyer the other transmission media. . '. . .. [2+4] .

: '.'1 0:~im~inY ~e' expr~s;ion.using K-Map, F{x,y,z). =; x'yz + x'y:z .~ ·xYz.and r~~i~e 'it ,using'" ~', .' ••••• < logic..,gates. . - .... ",. . " . .'. ' ," ~. "-' ..' J2+2]

11:"¥eritiori va-T-ious types of flip flops and. discuss about theJ-K flip flop with the helpof "'\>;' :' logic diagram. ; . ' . . .' ,-' '. . ,'. . ..' :(2+4]. .

12. Perform thefollowing:'t1x4] . :,..,,\: ,"

· a) (1 22)Hj'= (?)BCD ",;::';;~:. -, ", 'b) (423.25)8 = (?)2 ~., .. ..' . " .. ':".::'\('.

c) (l79.03125)10=(?)2 ..·:~·'i:f;;' .. ',:.:.'

d) SubtraGt (25)10 from (49)10 using 2i S complement method '..... ".,

13. Write short notes on: (anY·foUT).·[4~4] a) Data loggerbr Intemet I Intra.n.et c) 'c;lipper circuit ..' . . ~ . , d) Strain Gauge Transducer.__-~,-_ "':"--""

. e) Instrumentation s.yslelu-,-", :;. .. , "-:'~-

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