Engineering Talks Open Club  ·  24 members ### Category

Engineering Subjects

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1. What's new in this club
2. Write short notes on the following: (i) Stability criteria for an oscillator. (Rajasthan Univ. 2003 (ii) Hartley and Colpitt's oscillators. (iii) Hartley oscillator. (iv) Crystal oscillator. (v) R-C phase shift oscillator. (vi) Wien-bridge oscillator. You﻿ can write the answer an﻿d upload releva﻿nt images to justif﻿y the answer (if required) Let's together discuss and contribute in making th﻿e best answ﻿﻿﻿﻿﻿﻿e﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿r
3. ## Write short notes on any four of the following: (a) Basic principles of sinusoidal oscillator...

Write short notes on any four of the following: (a) Basic principles of sinusoidal oscillator (b) Crystal oscillator (c) Clap oscillator (d) Hartley oscillator (e) Phase shift oscillator f) Wien bridge oscillator You﻿ can write the answer an﻿d upload releva﻿nt images to justif﻿y the answer (if required) Let's together discuss and contribute in making th﻿e best answ﻿﻿﻿﻿﻿﻿e﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿r
4. ## Define the following terms used to specify the performance of an oscillator. (i) dial resolution...

Define the following terms used to specify the performance of an oscillator. (i) dial resolution, (ii) amplitude stability, (iii) frequency stabity, (iv) frequency range, (v) output impedance. You﻿ can write the answer an﻿d upload releva﻿nt images to justif﻿y the answer (if required) Let's together discuss and contribute in making th﻿e best answ﻿﻿﻿﻿﻿﻿e﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿r
5. Write the important factors in choosing a certain type of oscillato Why do we use R-C oscillators for audio frequencies and L-C oscillators for RF frequencies? Why does not an L-C tank is cuit produce sustained oscillations? Explain how the low frequency parasitics can be suppressed in an oscillator. You﻿ can write the answer an﻿d upload releva﻿nt images to justif﻿y the answer (if required) Let's together discuss and contribute in making th﻿e best answ﻿﻿﻿﻿﻿﻿e﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿r
6. Explain the working principle of a tunnel diode oscillator. Give the frequency range over which it is employed. You﻿ can write the answer an﻿d upload releva﻿nt images to justif﻿y the answer (if required) Let's together discuss and contribute in making th﻿e best answ﻿﻿﻿﻿﻿﻿e﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿r
7. Draw the block diagram of a beat frequency oscillator and explain the working of each block. You﻿ can write the answer an﻿d upload releva﻿nt images to justif﻿y the answer (if required) Let's together discuss and contribute in making th﻿e best answ﻿﻿﻿﻿﻿﻿e﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿r
8. Sketch the circuit schematic of a Wien bridge oscillator and explain its operation. Derive an expression for the frequency of oscillation and suggest a suitable scheme for amplitude stabilization of the oscillator. You﻿ can write the answer an﻿d upload releva﻿nt images to justif﻿y the answer (if required) Let's together discuss and contribute in making th﻿e best answ﻿﻿﻿﻿﻿﻿e﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿r
9. Draw the circuit of Wien bridge oscillator and explain how oscillations are generated ? You﻿ can write the answer an﻿d upload releva﻿nt images to justif﻿y the answer (if required) Let's together discuss and contribute in making th﻿e best answ﻿﻿﻿﻿﻿﻿e﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿r
10. Sketch the circuit for a Wien bridge oscillator. What determines the frequency of oscillation. Will oscillations take place the bridge is balanced ? You﻿ can write the answer an﻿d upload releva﻿nt images to justif﻿y the answer (if required) Let's together discuss and contribute in making th﻿e best answ﻿﻿﻿﻿﻿﻿e﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿r
11. What is Barkhausen criterion ? What do you mean by frequency stability and stability criterion in an oscillator Explain the Wien-bridge oscillator in detail. You﻿ can write the answer an﻿d upload releva﻿nt images to justif﻿y the answer (if required) Let's together discuss and contribute in making th﻿e best answ﻿﻿﻿﻿﻿﻿e﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿r
12. Sketch and explain the circuit of a phase shift oscillator using a bipolar junction transistor. You﻿ can write the answer an﻿d upload releva﻿nt images to justif﻿y the answer (if required) Let's together discuss and contribute in making th﻿e best answ﻿﻿﻿﻿﻿﻿e﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿r
13. What are the requirements of an oscillator circuit ? Draw a neat diagram of a phase shift oscillator using BJT. What advantage has the phase shift oscillator in the audio frequency You﻿ can write the answer an﻿d upload releva﻿nt images to justif﻿y the answer (if required) Let's together discuss and contribute in making th﻿e best answ﻿﻿﻿﻿﻿﻿e﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿r
14. What is Barkhausen criterion for the feedback oscillator? Draw a neat diagram of a phase shift oscillator using BJT. Derive an expression for its frequency of oscillation. You﻿ can write the answer an﻿d upload releva﻿nt images to justif﻿y the answer (if required) Let's together discuss and contribute in making th﻿e best answ﻿﻿﻿﻿﻿﻿e﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿r
15. Compare R-C phase shift and crystal oscillators You﻿ can write the answer an﻿d upload releva﻿nt images to justif﻿y the answer (if required) Let's together discuss and contribute in making th﻿e best answ﻿﻿﻿﻿﻿﻿e﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿r
16. Explain with figure the working of a typical inductance type high frequency oscillator. Discuss the limitations in realisation of radio frequency signals using transistor circuits. Explain how to realise radio-frequency signals using crystal oscillator. You﻿ can write the answer an﻿d upload releva﻿nt images to justif﻿y the answer (if required) Let's together discuss and contribute in making th﻿e best answ﻿﻿﻿﻿﻿﻿e﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿r
17. What are the advantages of using crystal oscillators ? Mention its applications. You﻿ can write the answer an﻿d upload releva﻿nt images to justif﻿y the answer (if required) Let's together discuss and contribute in making th﻿e best answ﻿﻿﻿﻿﻿﻿e﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿r
18. What is a piezoelectric crystal ? Sketch the circuit symbol, an electrical equivalent model and the variation of the reactance of the crystal with frequency. Explain how this crystal can be incorporated in an electronic circuit to form a stable oscillator. You﻿ can write the answer an﻿d upload releva﻿nt images to justif﻿y the answer (if required) Let's together discuss and contribute in making th﻿e best answ﻿﻿﻿﻿﻿﻿e﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿r
19. What is crystal oscillator? How it works ? Draw its equivalent circuit and derive results for impedance, resonant frequency You﻿ can write the answer an﻿d upload releva﻿nt images to justif﻿y the answer (if required) Let's together discuss and contribute in making th﻿e best answ﻿﻿﻿﻿﻿﻿e﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿r
20. Explain briefly, how the oscillations are maintained in Hartley oscillator. Also derive the expression of frequency of oscillation You﻿ can write the answer an﻿d upload releva﻿nt images to justif﻿y the answer (if required) Let's together discuss and contribute in making th﻿e best answ﻿﻿﻿﻿﻿﻿e﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿r
21. State Barkhausen criteria and explain the working of Hartley oscillator. You﻿ can write the answer an﻿d upload releva﻿nt images to justif﻿y the answer (if required) Let's together discuss and contribute in making th﻿e best answ﻿﻿﻿﻿﻿﻿e﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿r
22. How does the circuit of a Clapp oscillator differ from that of Colpitt's oscillator ? Derive frequency of oscillation of any one of them. You﻿ can write the answer an﻿d upload releva﻿nt images to justif﻿y the answer (if required) Let's together discuss and contribute in making th﻿e best answ﻿﻿﻿﻿﻿﻿e﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿r
23. Draw a neat circuit diagram of a Colpitt's oscillator using NPN transistor. Give its equivalent circuit. Derive expressions for the following: (i) The frequency of oscillatios (ii) The maximum gain for sustained oscillations. You﻿ can write the answer an﻿d upload releva﻿nt images to justif﻿y the answer (if required) Let's together discuss and contribute in making th﻿e best answ﻿﻿﻿﻿﻿﻿e﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿r
24. Draw the circuit diagram of a Colpitt's oscillator using transistor. Derive an expression for its frequency of oscillations. Deduce the starting condition for this oscillator. You﻿ can write the answer an﻿d upload releva﻿nt images to justif﻿y the answer (if required) Let's together discuss and contribute in making th﻿e best answ﻿﻿﻿﻿﻿﻿e﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿r
25. Draw and explain the circuit and working of any LC oscillator. You﻿ can write the answer an﻿d upload releva﻿nt images to justif﻿y the answer (if required) Let's together discuss and contribute in making th﻿e best answ﻿﻿﻿﻿﻿﻿e﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿r
26. Draw a neat sketch of a generalised resonant circuit oscillator using three impedances. Explain how this circuit can be used to behave as (i) Colpitt's oscillator (ii) Hartley oscillator. You﻿ can write the answer an﻿d upload releva﻿nt images to justif﻿y the answer (if required) Let's together discuss and contribute in making th﻿e best answ﻿﻿﻿﻿﻿﻿e﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿r
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