7/29/2019 Basic Electronics Jan 2013 New

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USN I I I I I I I I I I I lOELNlS/25First/Second Semester B.E. Degree Examination, January 2013

Basic ElectronicsTime: 3 hrs. Max. Marks: I00

Note: /. Answer FIVEfull questions choosing at least two from each part.

2

3

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2. Answer all objective type questions only in OMR sheet page 5 of he Answer Booklet.3. Answers to objective type questions on sheets other than OMR will not be valued.

PART -Aa. Choose the correct answer : (04 Marks)i) A device which allows th e current flow in one direction but does not allow it in the opposite direction is ca lled _ _ .

(A) Transi stor (B) Filter (C) Regulator (D) Rectifier.ii) The capacitance of a forward biased p - n functi on is called__

(A) Diffusion (B) Conventional (C) Drift (D) Transitioniii) The zener power dissipation is g iven by the product of _ _ _

(A) VR. lz (B) VF, lz (C) Vz . lz (D) None of theseiv) The maximum efficien cy of full wave rectifier is _ _ _

(A) 40.6% (B) 60.4% (C) 78.5% (D) 81.2% .b. Explain the forward and reverse characteristics for a Ge diode, with a neat fi gure.(05 Marks)c. With a circuit diagram, expla in the working of a full wave recti fie r. Draw relevant waveforms. (06 Marks)d. A 9V re ference sou rce is to be designed usi ng a zener diode and a resistor connected in series to a 30V supply. Select

suitable components and calculate the circuit current when the supply voltage drops to 27V . Ass ume lzy = 200mA.(05 Marks)

a.

b.c.d.a.

b.c.a.

b.c.d.

Choose the correct answer :i) A t rans istor is cutoff when - ----::-

(A) Both emitter and co llector fun ction reverse bi ased(B) The emitter functi on is reversed biased but the coll ec tor function is forward biased.(C) Both emitter and collector functi on are forward biased.(D) The emitter function is forward bi ased but the collector function is reversed bi ased.

i ) If a = 0. 95. than the va lue o f ~ of the transi stor is__(A) 0.05 (B) I 9 (C) I00 (D) I 20

iii) The o utput characteristics of aCE configuration is a graph between _ _ _ .(A) VBE Is (B) Vs E, VeE (C) VeE , leiv) The Q - point is also known as _ _ _

(04 Marks)

(A) Open point (B) Operating point (C) D. C. point (D) A.C point.Explain the working o f a current amp lifi cation using transistor. (05 Marks)Exp lain with the help of circuit diagram the working of input and output characteristics of transistor in CB configuration.. (07 Marks)For a ce rtain transisto r circuit. lc = 12.42mA and 18 = 2 0 0 ~ A , find i) IE ii) a a n d ~ of transistor. (04 Marks)Choose the correct answer : (04 Marks)i) In the bi as ing ci rcuit. the one whi ch gives most stable operating point.

(A) Base bias (B) Co llector to base bias (C) Voltage divider bias (D) None of these.ii) Stability factorS for base bias circuit is ----=-- -

(A) S (B) S (C) (D) S = II( I + ~ ) iii) Diode can be used tor compensation of _ __ chan ges in voltage divider bias circuit

(A) VsE (B) VCE (C) Veeiv) In emitter bias circuit__ is connected between emitter and ground.(A) Inductor (B) Capacitor (C) Resistor (D) Diode

With a c ircuit diagram. explain the operation of collector- to base bias circuit. (08 Marks)The voltage divider bias circui t has Vec = I SV . R1 = 6.8kn , R2 = 3.3ki1. Rc = 900n, RE = 900n and hFE=50.VBE = 0. 7V. Find the levels of VE 18 lc. VcE and VC Draw the DC load I ne a nd mark the Qpoint on that. (08 Marks)Choose the correct answer : (04 Marks)i) SCR is a device

(A) NPN (B) PNP (C) PNPNii) SC R crow bar circuit is used for protection against

(A) under voltage (B) over current (C) under currentiii) The intrinsic stand- of f ration ofUJT

(A) must be less than unity (B) must be greater than unity (C) must be zeroiv) FET is a controlled device.

(A) Voltage (B) Current (C) Powe rExpla in the working of two transistor model of SC R.Expl ai n with a neat figure the construction of a P - channel JFET.Give the eq uivalent circuit of UJT.

(D) PNN(D) over voltage.(D) must be negative(D) None of these

(06 Marks)(06 Marks)(04 Marks)

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7/29/2019 Basic Electronics Jan 2013 New

2/2

lOELNlS/25

PART-8

5 a. Choose the correct answer: (04 Marks)i) In an oscillator we use feedback .(A) Positive (B) Negative (C) Neither (D) Unity gainii) The two Barkhausen conditions to be satisfied by oscillator are__(A) A :::; l, shift = 0 (B) IAP I :=:: L shift= 0 (C) IAP I =:: l. shift = 90 (D) IAP I =::. shift = 180 iii) In RC coupled amplifier the d. c. component is blocked by__(A) load resistance RL (B) coupling capacitor, Cc (C) R8 (D) the transistoriv) f1(fL) and f2( fH) are known as __ requencies(A) half (B) half power (C) decibel (D) mid band

b. With the help of circuit diagram, explain the working of aR C coupled single state CE amplifier. (06 VI arks)c. List the advantages of negative feedback. (05 Marks)d. Calculate the value of an inductor to be used in Col pitt's oscillator to generate a frequency of 1OM Hz. Assume the va lues

of cI= I00 pf and c2 =5 0 pf. (05 Marks)6 a. Choose the correct answer : (04 Marks)

7

i) The ideal value ofCMRR is(A) 90dB "(8)2x 105 (C) 0 (D) ooii) The PSRR is generally measured in _ _(A) dB (B) mVIY (C) 1.tY!V (D) V/J.lSiii) The gain of voltage follower is__(A) zero (B) infinite (C) negative (D) unityiv) If we apply a square waveform to a differentiator, then we ge t__ t the output(A) cosine wave (B) ramp (C) sine wave (D) train of impulsesb. Give the ideal op-amp characteristics. (05 Marks)c. With the help of circuit diagram, explain the working of an op-amp used as integrator. (06 Marks)d. Design an adder circuit usi ng op- amp to obtain an output expression Y0 = -(0.1 V1 + 0.5Y2 + 20Y3). where V1 V and V,are the inputs. Select Rr = !Okf.! (05 Marks)a. Choose th e correct answer :

b.c.d.

i) Ov er modulation exists when modulation index is(A) I (B) 0 (C) > Iii) The relation between carrier power and total power in an AM wave is _ _(A) Pc = PT(1+(m

2/4)) (B) Pc =PT( I+(m

2/2)) (C) PT=Pc(l+(m

2/4))iii) The amplitude of both the side bands in an AM wave is __(A) Ec 212m (B) m2Ec /2 (C) mEc/2iv) Hexadecimal and octal numbering systems are similar tor the first(A) 9 digits (B) 8 digits (C) 7 digitsExplain the need tor modulation.With the help of block diagram, explain the working of super heterodyne receiver.Perform the following decimal subtraction using 9' s complement method : i) 49- 24'

(04 Marks)(D) < I.

(D) PT = Pc( l+(m2/2 ))

(D) 6 digits.(06 Marks)(06 Marks)ii) 32! - 579. (04 Marks)

8 a. Choose the correct answer : (04 Marks)i) For EX - NOR gate the output is l if__(A) even number of inputs is 0 (B) even number of inputs is 1(C) odd number of inputs is 0 (D) odd number of inputs is 1.ii) Which of these are universal gates?(A) only NOR (B) onl y NANS (C) Both NOR & NAND (D) NOT. AND. OR

iii) The result of binary addition I + 1 + I is __(A) carry 0, sum 0 (B) cany 0, su m 1 (C) cany I, sum 0 (D) carry I. sum liv) A half adder has__ nputs and _ _ outputs.(A) I, I (B) I, 2 (C) 2, I (D) 2. 2b. State Define Morgan's theorems. (04 Marks)c. Simplify the following Boolean expressions : i) Y = AB + A C + BC ii) Y = (A + B + C) (A +B + C)

iii) Y = C (B +C) (A+ B +C ). (06 Marks)d. What is full adder? Give its truth- table. Implement the full adder using logic gates. (06 Marks)

*****

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