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Previous Year Exam Questions for Analog Electronic Circuits - AEC of 2018 - BPUT by Bput Toppers

  • Analog Electronic Circuits - AEC
  • 2018
  • PYQ
  • Biju Patnaik University of Technology Rourkela Odisha - BPUT
  • Electronics and Instrumentation Engineering
  • B.Tech
  • 2 Offline Downloads
  • Uploaded 9 months ago
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Registration No : Total Number of Pages : 02 B.Tech PEI3G001 3rd Semester Regular Examination 2018-19 ANALOG ELECTRONIC CIRCUITS BRANCH : AEIE, EIE, IEE Time : 3 Hours Max Marks : 100 Q.CODE : E975 Answer Question No.1 (Part-1) which is compulsory, any eight from Part-II and any two from Part-III. The figures in the right hand margin indicate marks. Q1 a) b) c) d) e) f) g) h) i) j) Q2 a) b) c) d) e) f) g) h) i) j) k) l) Part- I Short Answer Type Questions (Answer All-10) (2 x 10) Find the applied voltage on a forward biased diode if the current is 1mA and reverse saturation current is 10-10A. Temperature is 250C and take ideality factor as 1.5. For a diode the transition capacitance was 15pF. The diode is replaced with another diode of same material with twice cross sectional area. Terminal voltage remains unchanged. Calculate the capacitance of new diode. Define drift and diffusion current. What do you mean by CMRR? How it affects the performance of Op-Amp. What is peak inverse voltage? If peak voltage on a half wave rectifier circuit is 5V and diode cut-in voltage is 0.7, then obtain the peak inverse voltage on diode. Why feedback is necessary in amplifiers? How to select the operation point for BJT? An amplifier is burst into oscillation when the loop gain Aβ=1, but for sustained oscillation Aβ>1, Why so? Why BJT is called current controlled device where the FET is called voltage controlled device. Part- II Focused-Short Answer Type Questions- (Answer Any Eight out of Twelve) Derive an expression for stability factor S(ICO) for a voltage divider bias circuit. Draw the emitter follower circuit. Derive expression for Zi ; Zo ; and AV using Re model. Explain the high frequency response of BJT amplifier using ac equivalent model and obtain the equation of input output capacitance. Explain the cascade connection of general amplifier with the help of block diagram. Write its advantage. Give the list of power amplifiers. Explain series fed class A amplifier with necessary circuit and output waveforms. Also calculate the efficiency. Explain with the help of circuit diagram of Hartley Oscillator. Design an emitter-bias network using the following data ICQ = ½ IC(Sat), VCEQ = ½ VCC, VCC = 20V, IC(Sat) = 10mA, β= 120, RC = 4RE Define h-parameter and hence derive h-parameter model of a CE-BJT. Explain with diagram, Emitter follower configuration. Justify how voltage gain is approximated unity. What is clipper circuit? With circuit diagram explain the working of simple negative clipper. Also sketch the output for sinusoidal input of 20V peak to peak. A crystal has L= 0.4H, C= 0.085pF, CM=1pF, R= 5KΩ, find i. Series resonant frequency ii. Parallel resonant frequency iii. Quality factor of crystal Derive the conditions of oscillation in a Wein-bridge oscillator. (6 x 8)

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Q3 Part-III Long Answer Type Questions (Answer Any Two out of Four) a) For distortion reading of D2 = 0.15, D3 = 0.01 and D4 = 0.05 with I1 = 3.3Amp and RC = 4Ω. Determine i. Total Harmonic Distortion ii. Fundamental Power component iii. Total Power b) List the difference between i. FET and BJT ii. JFET and MOSFET (8) (8) Q4 a) Explain how Op-Amp can be used for voltage summing amplifier. b) Write a note on Voltage Controlled Oscillator. (8) (8) Q5 a) Explain the operation of a transistor as a switch with the help of neat diagram and wave forms. b) Explain the working of full wave bridge rectifier and derive the expression for ripple factor and efficiency. (8) a) Write a note on Darlington configuration. b) Draw the Op-amp phase shift oscillator and derive the expression for frequency of oscillation. (10) (6) Q6 (8)

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