Set No.

1 Code No.220101 II-B.Tech. II-Semester Supplementary Examination January - 2003 APPLIED ELECTRONICS (Civil Engineering) Max.Marks:80 Answer any FIVE questions All questions carry equal Marks ---

.in

Time:3 hours

Explain how a P-N junction operates when it is forward biased and reverse biased. Define the terms Zener break down and Avalanch Break down.

2.a)

Draw the circuit diagrams of CE, CB and CC configurations. Compare the performance quantities of the above amplifiers. How is field effect Transistor operate? Justify the name given to it.

b)

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1.a) b)

Realize AND, OR, NOT, NOR, EXOR gates using NAND gates. Draw the Full wave rectifier circuit with and without filter and explain its improvement in operation with filter.

4.a)

Derive the voltage gain, current gain, input impedance and output impedance expressions for a CE amplifier. A CE BJT amplifier has the following circuit parameters RL = 10K, RE = 2K, RS = 10K, hie = 2K, hfe = 60, ro = 100K. Find AV, AI, Ro and Ri without RE.

b)

5.a) b) 6.a)

Draw the 4 basic types of feedback configurations. What is the effect of feedback on Impedance levels in these 4 types. Explain the Barkhussain’s crieterion for sustaining the oscillations. Give the construction of an electrostatically deflected CRT and explain its function. How are the parameter like frequency, voltage and current measured using CRO.

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b)

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3.a) b)

7.a)

b)

Write short note on: a) RC-Phase shift oscillator b) Compare BJT and FET.

Aj

8.

Explain the working principle of Piezo-electric transducer and Temperature transducer. Explain the working of regulated power supply.

***

***

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Set No.

2 Code No.220101 II-B.Tech. II-Semester Supplementary Examination January - 2003 APPLIED ELECTRONICS (Civil Engineering) Max.Marks:80 Answer any FIVE questions All questions carry equal Marks ---

b)

Draw the energy band diagram of a P-n junction diode under open circuit conditions. Obtain the equation for Eo. Derive the equation of Total diode current.

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1.a)

.in

Time:3 hours

2.a) b) c)

Explain why PN junction acts as a rectifier. What is the difference between drift current and diffusion current? Explain. Explain how a zener works as a voltage regulator.

3.a)

Describe the output characteristics of a BJT. How can it be turned into an amplifier. Also show different regions of operations. Draw the circuit of a Full wave rectifier with capacitor filter. How does it give better output. Explain.

b)

Discuss the difference between +ve and –ve feedback. Derive expressions for the input and output resistances in current series feedback amplifier.

5.a) b)

Explain the operation of a CRO for the display of waveforms. What is meant by focusing? Explain in detail.

6.a) b)

Explain any one of the pressure transducer operating principles. Design an CE amplifier circuit for  = 50, Vcc = 12v and Ic = 15mA.

nt

uW

4.a) b)

List out the truth tables of all logic gates and explain the working. Compare and contrast the BJT and FET.

8.

Write short notes on: a) Working of a regulated power supply b) Derive conditions for oscillations and equation for frequency of oscillations of an RC phase shift oscillator.

Aj

7.a) b)

***

***

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Set No.

3 Code No.220101 II-B.Tech. II-Semester Supplementary Examination January - 2003 APPLIED ELECTRONICS (Civil Engineering) Max.Marks:80 Answer any FIVE questions All questions carry equal Marks ---

b) 2.a) b) 3.a) b)

Draw the V-I characteristics of PN diode junction. Explain the principle of operation. Explain how a transistor acts as an amplifier.

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1.a)

.in

Time:3 hours

Analyze the half wave rectifier operation. Derive the % regulation and the ripple factor. Derive the relation between  and  of a transistor. What are the advantages and disadvantable of a negative feedback in an amplifier. Analyze. Explain the concept of Oscillator. Explain the construction and working of CRT. Explain about the deflection plates in CRO.

5.a) b)

Draw and explain the principle of operation of a strain gauge. How do you measure displacement using LVDT? Explain.

6.a) b)

Draw the circuit of a CE amplifier and explain its operation. What is the overall effect on the frequency in a cascaded amplifier response.

7.a) b)

Find out the effect of –ve feedback on Bandwidth and noise of an amplifier. Realize all other gates using NAND gates.

8.

Write short notes on: a) CRO and its applications b) Filters used in rectifiers.

Aj

nt

uW

4.a) b)

***

***

***

Set No.

4

.in

Code No.220101 II-B.Tech. II-Semester Supplementary Examination January - 2003 APPLIED ELECTRONICS (Civil Engineering) Time:3 hours Max.Marks:80 Answer any FIVE questions All questions carry equal Marks --1.a) Explain the following terms of a pn-junction without any external bias i) Carrier density (ii) Charge density (iii) Electric field Intensity iv) Potential energy for holes and electrons across the junction. b) Write a note on Depletion layer capacitance and diffusion capacitance of a p-n junction. Explain how a Zener diode works as a voltage regulator. Explain the principle and operation of FET.

3.a)

Show that the rectification efficiency of a half wave rectifier circuit is r = 40.6/(1+RS/RL)%. Draw the CE amplifier equivalent circuit and derive the expressions for voltage gain, current gain, Ri and Ro.

4.a) b)

5.a)

Draw the basic configuration of phase-shift oscillator circuit. Derive the expressions for the conditions for oscillations to occur. A quartz crystal has the following constants: L = 0.05H, C1 = 0.02Pf, R = 500 ohms and C2 = 12Pf. Find the values of fS and fp. If the external capacitance across the crystal changes from 5Pf to 6Pf. Find the change in frequency of oscillations.

nt

b)

Plot the overall frequency and phase response of an RC coupled amplifier and explain. What are the general properties of Feedback amplifier? Explain how they are achieved by negative feedback.

uW

b)

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2.a) b)

Draw the block diagram of a CRO. Explain its operation. Explain how the measurement of voltage, current and frequency are measured using CRO.

7.a)

What is a transducer? Explain briefly the principle and working of LVDT and Strain gauge. Define the terms accuracy, resolution, precision and linearity in measurements.

Aj

6.a) b)

b)

8. (a)

Write short note on: Comparision of CB,CE,CC amplifiers. (b) Universal gates and their truth tables. *** *** ***

Set No.

Code No.220101. II-B.Tech. II-Semester Supplementary Examination January - 2003 · APPLIED ELECTRONICS · (Civil Engineering) · Time:3 hours · Max.
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