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Posted By: tamil Member Level: Gold Posted Date: 14 Jun 2008
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2007 Anna University B.E Electronics and Communication Electronics Circuits I Question paper
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Electronics Circuits I
ANSWER ALL QUESTIONS
PART-A
Answer all questions.
1. An amplifier with open loop voltage gain Av=1000+ or - 100 is available. It is required to have an amplifier whose voltage gain varies by no more than + or - 0.1%. Find the reverse transmission factor B.
2. Draw the schematic circuit of trans-resistance amplifier. Specify conditions for Ri and Ro.
3. What are the advantages and disadvantage of RC phase shift oscillators?
4. Give the expressions for fs and fp of crystal oscillator.
5. Where is the Q point placed in a class c amplifier? What are its applications?
6. What is neutralization?
7. State relation between rise time and fH and also sketch response of low pass RC filter for pulse input.
8. State the role of commutating capacitors in bi-stable multi vibrator.
9. List the different methods available for generation of ramp waveforms.
10. What is a blocking oscillator? Give one application.
PART-B
11(a) (1) Discuss the classification of feedback amplifiers with schematic (topology). How is the impedance level modified in each type?
(2) Derive expression for Avf with positive feedback and negative feedback and state condition for stability in negative feedback amplifiers.
Or
11(b) (1) An RC coupled amplifier has a voltage gain of 1000, f1 = 50hz, f2 = 200khz and distortion of 5% with feedback. Find Avf, BWf when B = 0.001 is applied.
(2) Elaborate the method of identifying feedback topology.
(3) With example prove that negative feedback increases stability.
12(a) (1) Draw the RC phase shift oscillator. Explain its operation and derive condition for sustained oscillation and frequency.
(2) Calculate the inductance value to produce 734.5 kHz frequency of oscillation in clapp oscillator having C1 = 0.1 micro farad, C2 + 1 micro farad, C3 = 100 micro farad.
Or
12(b) (1) Explain the working of miller type oscillator with circuit. Give two applications.
(2) Give reasons why quartz crystal oscillator. State its advantages and application.
13(a) (1) Draw the circuit of class C tuned amplifier and explain its operation with relevant waveforms.
(2) Discuss the hazeltine method of neutralization with circuit.
Or
13(b) (1) Discuss the instability of tuned amplifier.
(2) Explain the working of emitter coupled a-stable multi vibrator.
14(a) (1) Draw the circuit of differentiator and explain the generation of narrow spikes from square wave. What are its applications?
(2) With circuit discuss schmit trigger operation. Obtain expression for UTP and LTP.
Or
14(b) (1) Discuss the working of a self biased bi-stable multi vibrator.
(2) Explain the different methods of triggering mono-stable multi vibrators.
15(a) (1) Explain the miller time base generator.
(2) Explain triggered blocking oscillator.
Or
15(b) (1) For a bootstrap sweep circuit show that ps = (1-A) Vo (Ts)/Vo (t) = Av/R1C integration of dt.
(2) Compare the diode and RC network type of astable blocking oscillators.
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