Download AKTU B-Tech 6th Sem 2016-2017 EEC609 Analog And Digital Communication Question Paper

Download AKTU (Dr. A.P.J. Abdul Kalam Technical University (AKTU), formerly Uttar Pradesh Technical University (UPTU) B-Tech 6th Semester (Sixth Semester) 2016-2017 EEC609 Analog And Digital Communication Question Paper

Printed Pageszl RollN0.I I I I I I I I I I I EEC609
B.TECH.
THEORY EXAMINATION (SEM?VI) 2016-17
ANALOG AND DIGITAL COMMUNICATION
T ime : 3 Hours Max. Marks : 100
Note .' Be precise in your answer. In case ofnumericalproblem assume data wherever not provided.
SECTION ? A
1. Explain the following: 10 x 2 = 20
(a) Define Modulation.
(b) Write two advantages of Digital communication over Analog communication.
(c) What do you mean by figure of merit?
(d) Define the term ?frequency deviation?.
(e) Calculate the power content of an AM signal with carrier power lOOkW having 60%
modulation.
(1) Why FSK is preferred over ASK?
(g) Define information.
(h) Explain the nyquist criteria for sampling.
(i) Define depth of modulation.
(j) What is entropy?
SECTION ? B
2. Attempt any ?ve of the following questions: 5 x 10 = 50
(a) What is delta modulation? Discuss the errors in Delta modulation technique.
(b) Explain the operation of Square law modulator for the generation of AM signal with the
help of proper circuit representation.
(c) The antenna current of an AM transmitter is 10 A when only the carrier is sent, but it
increase to 10.63 A when the carrier is modulated by a single sine wave. Find the
percentage of modulation. Determine the antenna current when the percentage of
modulation changes to 0.8.
(d) Brie?y explain the generation of Frequency Shift Keying signal. Also, discuss its
probability of error.
(e) Explain the following terms:
(i) Thermal Noise (iv) Signal to Noise Ratio
(ii) Shot noise (V) Equivalent Noise Temperature
(iii) Noise Figure
(1) Derive the expression for channel capacity of a continuous channel.
(g) Explain the generation of SSB-SC signal with the help of suitable block diagram and
expressions.
(h) Compare the following: i) TDM and FDM ii) FM and PM
SECTION ? C
Attempt any two of the following questions: 2 x 15 = 30
3. Draw and explain the block diagram for indirect method of FM generation. Also, find the
frequency deviation and bandwidth of a frequency modulated signal given by 1000s (2nX106t
+ 5sin 61tX103t).
4. Design a binary Huffman code for a discrete source having seven independent symbols having
probabilities 0.25, 0.25, 0.125, 0.125, 0.125, 0.0625 and 0.0625 respectively. Also, calculate
the efficiency of this code.
5. Describe the various performance parameters of Radio Receivers. Also mention the advantages
of superheterodyne receiver over TRF.