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# 2014 Acharya Nagarjuna University II/IV B.Tech - 2nd Semester - Electronic Circuits I - Bapatla Engineering College - January 2014 Question paper

 Course: University/board: Acharya Nagarjuna University

Do you need the old question papers of Electronic Circuits I - Bapatla Engineering College - B.Tech? This is the original question paper from the B.Tech second year second semester exam conducted by Bapatla Engineering College in January 2014. Feel free to store a copy and use it to prepare for your upcoming exams.

II/IV B.Tech Degree Examinations, January 2014

Second Semester

Electronic Circuits I

Time : 3 hours

Maximum Marks : 60

Answer ONE question from each Unit

1. Answer the following [12 x 1 = 12M]
a) What are the advantages of h-parameters?
b) Define Millers Theorem.
c) Draw the low frequency small signal model of JFET.
d) Explain Second Harmonic Distortion.
e) What are the advantages of Push Pull Power Amplifier?
f) What is the efficiency of Class B Amplifier?
g) Define Feedback Factor.
h) Draw the circuit diagram of a Voltage series feedback amplifier.
i) What are the advantages of Negative Feedback?
j) What are the advantages of Crystal Oscillator?
k) What are the Barkhusen conditions for oscillations?
l) Draw the circuit diagram of Hartley oscillator.

UNIT - I [1 x 12 = 12M]

2. a) Analyze a single stage transistor amplifier using h-parameters.
2. b) Explain the operation of cascode transistor amplifier. (OR)
3. a) Explain Millers Theorem with a neat circuit diagram.
3. b) Explain Bootstrapped Darlington pair in detail.

UNIT - II [1 x 12 = 12M]

4. a) Explain the working of Class A power amplifier.
4. b) Derive the efficiency value for class B power amplifier. (OR)
5. a) A class B push pull amplifier must deliver 12 W of audio power to the output load. If the output transformer is 75% efficient, what the maximum power is drawn on the power supply under optimum conditions.
5. b) Explain Transformer coupled class A power amplifier.

UNIT - III [1 x 12 = 12M]

6. a) With the help of general block diagram explain the term feedback.
6. b) Compare various feedback amplifiers with different topologies. (OR)
7. a) Draw the circuit diagram of a voltage series feedback and derive expressions for input and output resistances.
b) If an amplifier has a bandwidth of 300 K Hz and voltage gain of 100, what will be the new bandwidth and gain if 10% negative feedback is introduced? What will be the gain bandwidth product before and after feedback? What should be the amount of feedback if the bandwidth is to be limited to 800 K Hz.

UNIT - IV [1 x 12 = 12M]

8. a) Derive the frequency of oscillation of RC phase shift oscillator and explain the circuit.
8. b) A crystal has the following parameters: L=0.5 H, C1=0.06 pF, Cm=1 pF and R=5 K Ohms. Find the series and parallel resonant frequencies and Q-factor of crystal. (OR)
9. For a full wave rectifier derive the following
1. Average d.c current
2. Average d.c Voltage
3. R.M.S value of current
4. D.C power output
5. Rectifier efficiency
6. Ripple Factor

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