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Previous Year Exam Questions of Analog Electronic Circuits of bput - AEC by Verified Writer

  • Analog Electronic Circuits - AEC
  • 2017
  • PYQ
  • Biju Patnaik University of Technology Rourkela Odisha - BPUT
  • Electronics and Instrumentation Engineering
  • B.Tech
  • 12519 Views
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Registration No: Total Number of Pages: 02 B.Tech PEI3G001 3rd Semester Regular Examination 2017-18 ANALOG ELECTRONIC CIRCUITS BRANCH: AEIE Time: 3 Hours Max Marks: 100 Q.CODE: B1207 Answer Question No.1 and 2 which are compulsory and any four from the rest. 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) Answer the following questions: multiple type or dash fill up type : An op-amp has zero gain for common mode inputs. Then CMRR = a) zero b) infinite c) high d) low In a power amplifier the collector current flows for 270° of the input cycle. The operations is a) class A b) class B c) class AB d) class C A CB amplifier has IE = 3.5 mA, = 0.98 and RL = 600 Ω. The input impedance a) 0.98Ω b) 0.026Ω c) 0.026/(3.5 × 10 )Ω d) 600Ω Which op-amp circuit uses a capacitor in series with input and resistance in feedback path? a) Differentiating amplifier b) Integrating amplifier c) Logarithmic amplifier d) None of the above An oscillator requires an amplifier a) with negative feedback b) with positive feedback c) with either positive or negative feedback d) none of the above Which circuit is called emitter follower? a) CC b) CB c) CE d) Both (a) and (b) CE mode input V-I characteristic can be shown by a plot of a) VBE versus iB for constant values of VCE b) VCB versus iC for constant values of IE c) VCE versus iE for constant values of VEB d) VCE versus iE for constant values of VCE In a FET, gm varies as a) b) c) d) (2 x 10) Which of the following parameters of CE circuit has the unit of ohms? a) ℎ b) ℎ c) ℎ d) ℎ When a JFET is cut off, it’s like an __________ switch and when it is saturated, it’s like aswitch. a) closed, open b) open, closed c) open, open d) closed, closed Answer the following questions: Short answer type : Why a fixed bias is called so? Justify. What is crossover distortion? How can this be minimized? Why it is necessary to provide proper dc biasing to a BJT/FET amplifier? Define gain of a BJT amplifier at low frequencies and high frequencies? What are the advantages of push-pull power amplifier? Justify. Why square wave is fed to an amplifier for testing purpose? An amplifier is burst into oscillation when the loop gain Aβ=1,but for sustained oscillation Aβ>1. Why so? Define slew rate and CMRR for an op-amp. Draw the electrical model of a piezoelectric crystal. Define the safe operating area of a transistor with suitable sketch. (2 x 10)

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Q3 a) b) Q4 a) b) Q5 a) b) Explain the characteristics of a JFET. With diagram, explain the self- biasing schemes used in JFET. Derive necessary equations relating voltage and current at different terminals in this bias. Sketch hybrid- model of CB amplifier. Derive relations of gain, input and output impedances. (10) Derive the expression for IC and VCE for a CE amplifier with bypass RE and with unbypassed RE and compare the results. List advantages and disadvantages of negative feedback on amplifier performance. How it affects various parameters of an amplifier? (10) Differentiate between differential and common mode operation of an OPAMP? Define CMRR and its significance. Explain a differentiator circuit using OP-AMP. State and explain the Barkhausen criterion for sustained oscillations. Discuss its importance in operation of an oscillator circuit. (10) (5) (5) (5) Q6 a) b) Derive the expression for high cut-off frequencies of a FET amplifier network. For a self-bias configuration of FET circuit with VDD=20V, RD=3.3KΩ, RS=1KΩ, RG=1MΩ, IDSS=8mA, VP= -6V, calculate , , VDS, VG, VD. (10) (5) Q7 a) Define h-parameters for a CE amplifier. With neat sketches explain how these can be obtained graphically from input and output characteristic of the transistor? What is Miller effect capacitance in a transistor-amplifier? How does it affect the cutoff frequency of the amplifier circuit? (10) Differentiate between power amplifier and voltage amplifier. Explain operation of a push-pull amplifier for class AB operation. What are the advantages of class B over class A amplifier? Which feedback technique is there in an emitter follower circuit? Draw the topology and derive the expression of input impedance for that feedback network. (10) With neat circuit diagram, explain the working of two-stage RC coupled amplifier and derive the output relation of each stage. Sketch the frequency response curve and discuss methods to improve gain bandwidth product. Show that OP-AMP can be used as voltage buffer and controlled sources. (10) b) Q8 a) b) Q9 a) b) (5) (5) (5)

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