Anna University ECE Question Paper

Will you please provide the question paper of Anna University Electronics And Communication stream?

As you are looking for the question paper of Anna University Electronics And Communication stream, here I am providing the list of few questions given below.

1. How many AM broadcast stations can be accommodated in a 100 kHz bandwidth
if the highest frequency modulating a carrier i s 5 kHz?
2. What are the causes of linear distortion?
3. Draw the block diagram of a method for generating a narrowband FM signal.
4. A carrier wave of frequency 100 MHz i s frequency modulated by a signal
20 sin(200¼ £ 103t):
What is bandwidth of FM signal if the frequency sensitivity of the modulation i s
25kHz=V .
5. When i s a random process called deterministic?
6. A receiver connected to an antenna of resistance of 50* has an equivalent noise
resistance of 30*. Find the receiver noise ¯gure.
7. What are the characteristics of superheterodyne receivers?
8. What are the methods to improve FM threshold reduction?
9. De¯ne entropy function.
10. De¯ne Rate Bandwidth and Bandwidth e±ciency.

Part B - (5 x 16 = 80 Marks)
11. (a) (i) Draw an envelope detector circuit used for demodulation of AM and ex-
plain its operation. (10)
(ii) How SSB can be generated using Weaver's method? Illustrate with a neat
block diagram. (6)
OR
11. (b) (i) Discuss in detail about frequency translation and frequency division mul-
tiplexing technique with diagrams. (10)
(ii) Compare Amplitude Modulation and Frequency Modulation.
(6)
12. (a) (i) Using suitable Mathematical analysis show that FM modulation produces
in¯nite sideband. Also deduce an expression for the frequency modulated
output and its frequency spectrum. (10)
(ii) How can you generate an FM from PM and PM from FM?
(6)
OR
12. (b) (i) A 20 MHz i s frequency modulated by a sinusoidal signal such that the
maximum frequency deviation is 100 kHz. Determine the modulation index
and approximate bandwidth of the FM signal for the following modulating
signal frequencies,
(1) 1 kHz (2) 100 kHz and (3) 500 kHz. (8)
(ii) Derive the time domain expressions of FM and PM signals.
(8)

13. (a) (i) Give a random process, X(t) = Acos(!t+µ), where A and ! are constants
and µ is a uniform random variable. Show that X(t) is ergodic in both
mean and autocorrelation. (8)
(ii) Write a short note on shot noise and also explain about power spectral
density of shot noise. (8)
OR

13. (b) Write the details about narrow band noise and the properties of quadrature
components of narrowband noise. (16)
14. (a) Derive an expression for SNR at input (SNRc) and output of (SNRo) of a
coherent detector. (16)
OR
14. (b) (i) Explain pre-emphasis and De-emphasis in detail. (10)
(ii) Compare the performances of AM and FM systems. (6)

15. (a) (i) Find the code words for ¯ve symbols of the alphabet of a discrete memory-
less source with probability f0.4, 0.2, 0.2, 0.1, 0.1g, using Hu®man coding
and determine the source entropy and average code word length. (10)
(ii) Discuss the source coding theorem. (6)
OR
15. (b) (i) Derive the channel capacity of a continuous band limited white Gaussian
noise channel. (10)
(ii) Discuss about rate distortion theory. (6)

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Can any one please provide me the B.E Electronics & Communication Engineering 5th sem question paper of Anna University?

As you are looking for the B.E Electronics & Communication Engineering 5th sem question paper of Anna University so it is given below in the form of PDF file

The list of subjects of the B.E Electronics & Communication Engineering fifth semester of the course is given below:
• Antenna and Wave Propagation
• Information Theory and Coding
• Micro-Electronics
• Computer Hardware Design
• Linear IC Applications
• Microprocessors & Interfacing
• Microprocessors (Pr)
• Linear Integrated Circuits(Pr)
• Training Report

Anna University B.E Electronics & Communication Engineering 5th sem question paper

PART A-[10 x 2 = 20]
1.What is propagation constant ? Which are its two components?
2.State the condition for distortionless line.
3.If the reflection co-efficient of a line is 0.3 ?_?-66?^° ¦ ,calculate the standing wave ratio.
4.What is the value of Z_° for the dissipationless line?
5.What are the characteristics of TEM wave?
6.Write Maxwell’s equations in point form.
7.A rectangular waveguide with dimensions a=8.5cm and b=4.3cm .Determine the cut-off frequency for ?TM?_10 mode of propagation.
8.What is meant by dominant mode of the wave?
9.What is meant by cavity resonator?
10.What is the dominant mode in circular waveguide ? Why ?

PART B-[5 x 16 = 80]
(a)(i) Derive the expression for voltage and current at any point on a transmission line in terms of receiving end voltage and current.[Marks 10]
11.(a)(ii) A line has the following primary constants
R=100 ?/km L=0.001 H/km
G=1.5 µv/km C=0.062 µF/km.
Find the characteristic impedance and the propagation constant .[Marks 6]
(or)
11(b)(i) Derive Campbell’s equation.[Marks 8]
11.(b)(ii) A generator of 1V,1kHz supplies power to a 100km transmission line terminated in 200 ? resistance. The line parameters are R=10?/km, L=3.8 mH/km, G=1µv/km, C=0.0085 µF/km Calculate the input impedance and reflection coefficient.[Marks 8]
12(a)(i)Define standing wave ratio and obtain the expression of VSWR in terms of reflection coefficient.[Marks 8]
12.(a)(ii) Derive the input impedance of a quarter wave line and discuss its applications.[Marks 8]
(or)
12.(b)(i) Obtain the length and the location of a short circuited stub for impedance
matching on a transmission line.[Marks 10]
12.(b)(ii) A load (50-j100)? is connected to a 50? line. Design a short circuited stub to provide matching between the two at signal frequency of 30Mhz using Smith Chart.[Marks 6]
13.(a)(i) Obtain the solution of field components of a TE wave between parallel plate , propagating in Z direction.[Marks 10]
13.(a)(ii)A pair of perfectly conducting planes are separated by 3.6cm in air. For ?TM?_10 mode determine the cut-off frequency and cut-off wavelength, if the operating frequency is 5Ghz.[Marks 6]
(or)
13.(b)(i) Derive the expressions for the field components of TEM waves between parallel conducting planes. Discuss the properties of TEM waves.[Marks 10]
13.(b)(ii)For a frequency of 10 GHz and plane separation of 5cm in air, find the cut-off wavelength, phase velocity and group velocity of the wave.[Marks 6]
14(a) Deduce the expressions for the field components of TM waves guided along rectangular waveguide. [Marks 16]
(or)
14.Derive the expression of wave impedance for TE and TM waves guided along rectangular waveguide.[Marks 8]
14.(b)(ii) A ?TE?_10 mode is propagated through a waveguide with a=10cm at a frequency of 2.5Ghz.Find the cut-off wavelength, phase velocity, group velocity and wave impedance.[Marks 8]
(or)
15.(a)(i) Derive the expressions for the field components of TE waves guided along circular waveguide.[Marks 10]
15.(a)(ii) A circular waveguide has an internal diameter of 6cm.For a 9GHz signal propagated in the ?TE?_11mode,calculate the cut-off frequency and the characteristic impedance [?(ha)?_11^1=1.84].[Marks 6]
(or)
15.(b)(i)Obtain the expression for the resonant frequency of a rectangular cavity resonator.[Marks 8]
15.(b)(ii) Calculate the lowest resonant frequency of a rectangular cavity resonator of dimension a=2cm, b=1cm and d=3cm.[Marks 8]

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