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VALLIAMMAI ENGINEERING COLLEGE SRM Nagar, Kattankulathur – 603 203 VALLIAMMAI ENGINEERING COLLEGE SRM Nagar, Kattankulathur – 603 203. DEPARTMENT OF ELECTRONICS & COMMUNICATION ENGINEERING QUESTION BANK SUBJECT : EC6401 – ELECTRONICS CIRCUITS-II SEM / YEAR: IV / II year B.E. UNIT I FEEDBACK AMPLIFIERS General Feedback Structure – Properties of negative feedback – Basic Feedback Topologies – Feedback amplifiers – Series – Shunt, Series – Series, Shunt – Shunt and Shunt – Series Feedback – Determining the Loop Gain – Stability Problem – Nyquist Plot – Effect of feedback on amplifier poles – Frequency Compensation. PART A Q. No BT Level Domain Questions 1. Define positive and negative feedback. BTL 1 Remembering 2. List out the three networks that are connected around the basic BTL 1 Remembering amplifier to implement feedback concept. 3. Write about sensitivity and de-sensitivity of gain in feedback BTL 1 Remembering amplifiers. 4. Examine the gain with feedback for the amplifier with open loop BTL 1 Remembering gain of 300 and feedback factor of 0.1. 5. Tabulate the input and output resistances of a negative feedback BTL 1 Remembering amplifier. 6. Identify the type of feedback in the circuit. BTL 1 Remembering 7. Predict the loop gain or return ratio of feedback amplifier. BTL 2 Understanding [EC6401 – EC II/Question Bank/2015‐2016 EVEN SEM/D.Murugesan, S.Marirajan, A.G.Murali Krishna] 8. BTL 2 Understanding Discuss the advantages of negative feedback in amplifiers. 9. Give the reason for negative feedback which increases BTL 2 Understanding bandwidth. 10. Describe the effect of gain in amplifier when voltage shunt & BTL 2 Understanding series feedback is employed. 11. Discover the impact of negative feedback on noise and distortion BTL 3 Applying in amplifier circuits. 12. Calculate the percentage of negative feedback. If the voltage gain BTL 3 Applying of the amplifier is 150 and a feedback used to reduce the distortion of an amplifier by 80 %. 13. Illustrate the current series & current shunt feedback. BTL 3 Applying 14. Analyzing the feedback factor of an amplifier. BTL 4 Analyzing 15. Differentiate Phase margin and Gain margin. BTL 4 Analyzing 16. Explain the decrease in output impedance in feedback amplifiers. BTL 4 Analyzing 17. Summarize the effect of negative feedback on amplifier BTL 5 Evaluating characteristics. 18. Evaluating the Nyquist criterion for stability of feedback BTL 5 Evaluating amplifiers. 19. Creating the equivalent circuit of Trans-conductance amplifier. BTL 6 Creating 20. Compose the stability condition using Nyquist criterion. BTL 6 Creating PART – B 1. Examine the expressions for gain with positive and negative BTL 1 Remembering feedback. [16] 2. List the effects of negative feedback on stability, distortion, noise, BTL 1 Remembering input and output impedance of a feedback amplifier. [16] [EC6401 – EC II/Question Bank/2015‐2016 EVEN SEM/D.Murugesan, S.Marirajan, A.G.Murali Krishna] 3. (i) A voltage-series negative feedback amplifier has a voltage gain without feedback as A = 500, input resistance R = 3kΩ, output i BTL 1 Remembering resistance R = 20kΩ and feedback ratio β = 0.01. Identify the o voltage gain A , input resistance R and output resistance R of the f if of amplifier with feedback. [8] (ii) The current-series feedback types of transistor amplifier for the given circuit diagram has the following parameters such as R 1 = 20kΩ, R = 20kΩ, R = 1KΩ, Re = 100Ω h = 80 and h = 2 L fe ie 2kΩ. Examine A, β, R , A and the loop gain in dB. [8] if f, 4. Describe the effect of a voltage series feedback on input and output resistance of a BJT amplifier. Explain the same, with BTL 2 Understanding necessary circuit, equivalent circuit and equations. [16] 5. Discuss the current shunt feedback connection and derive the BTL 2 Understanding expressions for R and R . [16] if of 6. An amplifier, without feedback, has a voltage gain of 500, lower cut-off frequency f =100Hz,upper cut-off frequency f = 250 kHz 1 2 and a distortion of 10%. Calculate the amplifier voltage gain, lower cut-off frequency and upper cut-off frequency and BTL 3 Applying distortion, sensitivity, de-sensitivity and bandwidth when a negative feedback is applied with feedback ratio of 0.01. [16] 7. (i) Illustrate the circuit diagram of voltage shunt feedback BTL 3 Applying amplifier [8] (ii)Examine the expressions for R and R . BTL 4 Analyzing if of [8] [EC6401 – EC II/Question Bank/2015‐2016 EVEN SEM/D.Murugesan, S.Marirajan, A.G.Murali Krishna] 8. (i) An amplifier, with feedback has voltage gain of 100. If the gain without feedback changes by 20 % and the gain with feedback should not vary more than 2 %. If so, Analyzing the values of open loop gain A and BTL 4 Analyzing feedback ratio β. [8] (ii) For the given emitter follower circuit, Analyzing A , R , A , i i v R & R if R = 600Ω, R = 2kΩ, h = 80 and h = o of s L fe ie 5kΩ. [8] 9. Explain the current series feedback amplifier with neat block BTL 5 Evaluating diagram and derive the expressions for R and R . [16] if of 10. Design the structure of Nyquist criterion to Analyzing the stability BTL 6 Creating of feedback amplifiers. [16] UNIT II OSCILLATORS Classification, Barkhausen Criterion - Mechanism for start of oscillation and stabilization of amplitude,General form of an Oscillator, Analysis of LC oscillators - Hartley, Colpitts,Clapp, Franklin, Armstrong,Tuned collector oscillators, RC oscillators - phase shift –Wienbridge - Twin-T Oscillators, Frequency range of RC and LC Oscillators, Quartz Crystal Construction, Electrical equivalent circuit of Crystal,Miller and Pierce Crystal oscillators, frequency stability of oscillators.. PART A Q.No Questions BT Level Domain 1. Define an oscillator. BTL 1 Remembering [EC6401 – EC II/Question Bank/2015‐2016 EVEN SEM/D.Murugesan, S.Marirajan, A.G.Murali Krishna] 2. Quote the Barkhausen criterion for an oscillator. BTL 1 Remembering 3. Tell the types of feedback oscillators. BTL 1 Remembering 4. List out the advantages of RC phase shift oscillator. BTL 1 Remembering 5. Label the equivalent circuit of an oscillator. BTL 1 Remembering 6. Write the advantages of crystal oscillator. BTL 1 Remembering 7. If L = 1 mH, L = 2 mH and C = 0.1 nF, Estimate the frequency BTL 2 Understanding 1 2 of oscillation for Hartley oscillator. 8. Give the equivalent circuit of quartz crystal and mention its series BTL 2 Understanding and parallel resonant frequencies. 9. Express piezoelectric effect. BTL 2 Understanding 10. Illustrate the electrical equivalent circuit of Crystal oscillator. BTL 2 Understanding 11. A Wien bridge oscillator is used for operation at 10 kHz. If the value of the resistor R is 100 KΩ, Calculate the value of BTL 3 Applying Capacitor C. 12. Classify the frequency range of RC and LC oscillators. BTL 3 Applying 13. Demonstrate the frequency stability of an oscillator. BTL 3 Applying 14. Order the types of RC & LC oscillators. BTL 4 Analyzing 15. Differentiate Hartley and Colpitts oscillator. BTL 4 Analyzing 16. Explain how the amplifier differs from oscillator. BTL 4 Analyzing 17. Judge how the feedback occurs in Armstrong Oscillator. BTL 5 Evaluating 18. In an RC phase shift oscillator, if R = R = R = 200kΩ and C = 1 2 3 1 C = C = 100 pF. Evaluating the frequency of oscillations. 2 3 BTL 5 Evaluating 19. Substitute L = 0.4mH and C = 0.004F and the frequency of BTL 6 Creating 2 oscillator F = 120kHz in the Hartley oscillator. Invent L value by 1 neglecting the mutual inductance. 20. Generalize the structure of an Oscillator. BTL 6 Creating PART – B 1. List out the general condition for oscillation and derive the frequency of oscillation for a LC oscillator. [16] BTL 1 Remembering [EC6401 – EC II/Question Bank/2015‐2016 EVEN SEM/D.Murugesan, S.Marirajan, A.G.Murali Krishna] 2. Examine the working of a Hartley oscillator with a neat circuit diagram and derive the frequency of oscillation [16] BTL 1 Remembering 3. Describe the working of crystal oscillators with neat circuit BTL 1 Remembering diagrams. [16] 4. (i) In a transistorized Hartley oscillator, the two inductances are BTL 2 Understanding 2mH and 20µH while the frequency is to be changed from 950kHzto 2050kHz. Predict the range over which the capacitor is to be varied. [8] (ii) In a Hartley oscillator, the value of the capacitor in the tuned circuit is 500pF and the sections of the coil have inductances 38µH and 12µH. Express the frequency of oscillations and the feedback factor β. [8] 5. Discuss the working of Miller and Pierce crystal oscillators BTL 2 Understanding with neat circuit diagrams. [16] 6. Solve the expressions for frequency of oscillation and condition BTL 3 Creating for sustained oscillation of Colpiits oscillator with neat circuit diagram. [16] 7. (i) What is Wien Bridge oscillator? Calculate its BTL 3 Creating frequency of oscillation. [8] (ii) Explain the frequency stability of oscillator. [8] BTL 4 Analyzing 8. With neat circuit diagrams Analyzing the working principle of the following: [16] i. Tuned collector oscillator BTL 4 Analyzing ii. Franklin oscillator iii. Armstrong oscillator 9. Explain the working of Twin T oscillator with neat circuit BTL 5 Evaluating diagrams. Give any two applications [16] [EC6401 – EC II/Question Bank/2015‐2016 EVEN SEM/D.Murugesan, S.Marirajan, A.G.Murali Krishna] 10. Develop the circuit diagram and explain the working principle of RC phase shift oscillator. Also derive the expression for BTL 6 Creating frequency of oscillation and condition for sustained oscillation. [16] UNIT III TUNED AMPLIFIERS Coil losses, unloaded and loaded Q of tank circuits, small signal tuned amplifiers - Analysis of capacitor coupled single tuned amplifier – double tuned amplifier - effect of cascading single tuned and double tuned amplifiers on bandwidth – Stagger tuned amplifiers – large signal tuned amplifiers –Class C tuned amplifier – Efficiency and applications of Class C tuned amplifier - Stability of tuned amplifiers – Neutralization - Hazeltine neutralization method.
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