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EC2151 ELECTRIC CIRCUITS AND ELECTRON DEVICES

SEM:II Branch: CSE & IT

"UESTION BAN#

UNIT . I

$ART.

A1. Define the following terms: i) Charge ii) Current iii) Voltage iv) Power2. Define the following terms: i) Mesh ii) Loop iii) Node iv) ran!h v)Networ"#. Distinguish $etween a ran!h and a node of a !ir!uit.%. Distinguish $etween a Mesh and a Loop of a !ir!uit.&. Define '!tive and Passive elements of the !ir!uits.(. Define nilateral and ilateral elements.*. Define linear and Non+Linear elements.,. Define Lumped and distri$uted elements-. ow is the ele!tri!al energ/ sour!es !lassified01. Define an ideal voltage and an ideal !urrent sour!e.

11. hat are dependent and independent sour!es012. hat are the different t/pes of dependent or !ontrolled sour!es01#. hat is resistan!e01%. rite down the V+ 3 relationship of passive !ir!uit elements.1&. Define 4hm.s law.1(. 5tate and e6plain 7ir!hhoff.s laws1*. 8wo resistan!es with the value of 91 92 are !onne!ted in i) series and ii) parallel. hat isthee;uivalent resistan!e01,. 8wo indu!tors with the value of L1 L2 are !onne!ted in i) series and ii) parallel. hat is thee;uivalent indu!tan!e01-. 8wo !apa!itors with the value of C1 C2 are !onne!ted in i) series and ii) parallel. hat isthee;uivalent !apa!itan!e02. 5tate voltage division rule.21. 5tate !urrent division rule.22. Define sour!e transformation.2#. rite down the formula for a star !onne!ted networ" is !onverted into a delta networ".2%. rite down the formula for a delta !onne!ted networ" is !onverted into a star networ".2&. hat is Mesh anal/sis02(. hat is Nodal anal/sis02*. hen do we go for super mesh anal/sis02,. hen do we go for super node anal/sis02-. 5tate superposition theorem.#. 5tate 8hevenin.s theorem.#1. 5tate Norton.s theorem.#2. 5tate ma6imum power transfer theorem.##. Define dualit/.#%. rite down few e6amples pf dual pairs.

$ART - B

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2. Derive the relationship to e6press three delta !onne!ted resistan!es into star.#. 8wo resistan!es 1&> and 2> are !onne!ted in parallel. ' resistan!e of 12> is !onne!ted inserieswith the !om$ination. ' voltage of 12 V is applied a!ross the entire !ir!uit. ?ind the!urrent in ea!h resistan!e voltage a!ross 12> resistan!e and power !onsumed in all theresistan!es.

%. ' resistan!e 9 is !onne!ted in series with a parallel !ir!uit !omprising two resistan!es of 12and ,>.8he total power dissipated in the !ir!uit is * watts when the applied voltage is 2V.Cal!ulate thevalue of 9.&. . ' ( >resistan!e is!onne!ted $etween and D. ' $atter/ sour!e of -V is !onne!ted with internalresistan!e of 1 >$etween ' and C su!h that ' is Bve and C is .ve. Cal!ulate !urrent through (>resistan!e $/ i)Norton.s theorem ii) 8hevenin.s theorem.

UNIT.

II$ART . A

1. hat is transient state02. hat is transient time0#. hat is natural response0%. hat is transient response0&. Define Lapla!e 8ransform fun!tion.(. hat is Lapla!e transform of eat sin at teat and tn.*. hat is inverse Lapla!e 8ransform0,. Define time !onstant of 9L !ir!uit.-. Define time !onstant of 9C !ir!uit.

1. hat is meant $/ natural fre;uen!/011. Define damping ratio.12. rite down the !ondition for the response of 9LC series !ir!uit to $e under damped for stepinput.1#. rite down the !ondition for the response of 9LC series !ir!uit to $e over damped for stepinput.1%. Define initial value theorem.1&. Define final value theorem.1(. hat is driving point impedan!e01*. hat is transfer point impedan!e01,. Define networ" fun!tion.1-. Define Pole and @ero.2. Define resonant !ir!uit.21. hen the !ir!uit is said to $e in resonan!e.22. hat is resonant fre;uen!/02#. Define andwidth.2%. Define sele!tivit/.2&. Define ;ualit/ fa!tor.2(. Define half power fre;uen!ies.

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2*. rite down the formula for indu!tive rea!tan!e and !apa!itive rea!tan!e.2,. ive the e6pression for ;ualit/ fa!tor of series 9LC !ir!uit.2-. ive the e6pression for ;ualit/ fa!tor of parallel 9LC !ir!uit.

$ART . B

1. Determine the e6pression of resonant fre;uen!/ and $andwidth of a series resonant !ir!uit.

2. Derive the e6pression for the half power $andwidth of a parallel resonant !ir!uit.#. hat is +fa!tor0 ?ind values of +fa!tor for an indu!tor and !apa!itor.%. 3n a single tuned resonant !ir!uit the applied voltage in a primar/ !oil L1AL2A #2 F M A2F se!ondar/ side !apa!itan!e C2 A .&F ?. Determine the resonantfre;uen!/ and the output voltage at this fre;uen!/.&. Derive the e6pression of ma6imum value of

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&.

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%#. hat is the other name for M45?

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2*. ive the appli!ations of L'5

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EC 2151 ELECTRIC CIRCUITS AND ELECTRON DEVICES

(Common to Biomedical Engineering, Electronics and Communication Engineering

and Information Technology)

(Regulation 2008)

Time : Three hours a!imum : "00 ar#s$ns%er $&& 'uestions

PART A (10 2 = 20 Marks)

" ind Re' of the resti*e net%or# 2 +etermine the current dra%n y the source as sho%n in- or the circuit sho%n in fig- determine the *alue of . at resonance and Band%idth of the circuit/ $ eries RC circuit consists of resistor of "0 and a ca1acitor of 0" as sho%n in ig/ $ constant *oltage of 20* isa11lied to the circuit at t0 +etermine *oltage across resistor and ca1acitor3 tate ass4$ction la%5 +efine diffusion ca1acitance6 +efine Base %idth modulation and ring out its conse'uences8 ention the ad*antages of 7ET o*er ET9 +ra% the t%o transistor model of an CR %ith its characteristic cur*e

"0 nder %hat 1rinci1le does a 1hoto *oltaic cell %or#;

PART B (5 16 = 0 Marks)

"" (a) (i) se The*enin and C 200 ? If the s%itch is closed %hen f -0@ +etermine thecurrent e'uation (ar#s 8)7r() (i) Consider the single tuned circuit" Resonant fre'uency2 7ut1ut *oltage at resonance and- a!imum out1ut *oltage

$ssume RsAA%r&, and #09 (ar#s 8)(ii) ith neat diagram, otain gain of a doule tuned am1lifier %ith critical *alue of mutual inductance (ar#s 8)

"- (a) (i) tate continuity e'uation and 1ro*e that concentration of changes is inde1endent of time %ith ero electricfield (ar#s 8)(ii) ith neat diagram, e!1lain the formation of D= unction and deri*e its de1letion %idth (ar#s 8)7r() (i) hat is the rea#do%n mechanism found in Fener diode; E!1lain it %ith neat diagram (ar#s 8)(ii) rite detailed notes on s1ace charge and diffusion ca1acitance (ar#s 8)

"/ (a) E!1lain the construction and %or#ing 1rinci1le of a ET and otain its characteristic 1arameters (ar#s "5)7r() E!1lain the o1eration of a +e1letion mode 7ET and its com1arison o*er enhancement 7ET %ith neatdiagrams (ar#s "5)

"3 (a) +iscuss the construction and o1eration of a Tunnel +iode %ith neat energy and diagram (ar#s "5)7r() rite detailed notes on:(i) +I$C and TRI$C (ar#s 3)(ii) Dhotodiode and Dhototransister (ar#s 3)(iii) &E+ and &C+ (ar#s 5)