JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD

JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech III Year PRINCIPLES OF COMMUNICATIONS Previous Question Paper (May - 2018 - R13)

B.Tech | III Year | I Semester | R13 | May - 2018

Answer PaperPaper Code: 115EJMaximum Marks: 75Time: 3 hours

Part A is compulsory which carries 25 marks. Answer all questions in Part A. Part B consists of 5 Units. Answer any one full question from each unit. Each question carries 10 marks.

PART - A

125 marks
a
List the sources of noise in a communication system.
2 marks

Answer

The primary sources of noise in a communication system include Thermal noise (Johnson-Nyquist noise), Shot noise, Partition noise, and Flicker noise (1/f noise), as well as external sources like atmospheric, industrial, and extraterrestrial noise.

b
Formulate Noise Figure and Signal to Noise ratio?
3 marks

Answer

The Signal-to-Noise Ratio (SNR) is defined as the ratio of signal power to noise power at a specific point in the system:

SNR = Psignal / Pnoise

The Noise Figure (F) is a measure of the degradation of the SNR as a signal passes through a system, defined as the ratio of input SNR to output SNR:

F = (SNR)input / (SNR)output
c
List out the applications of FM.
2 marks

Answer

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d
Write about Carson’s rule.
3 marks

Answer

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e
What is Inter Symbol Interference?
2 marks

Answer

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f
List out the applications of pulse modulation techniques.
3 marks

Answer

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g
Draw the ASK signal for the given message signal 101101.
2 marks

Answer

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h
Bring out the difference between DPSK and BPSK.
3 marks

Answer

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i
What is the Hamming distance of a double error correcting code?
2 marks

Answer

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j
What is systematic form of an (n, k) linear block code?
3 marks

Answer

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PART - B

210 marks
a
List the Classification of receivers.
5 marks

Answer

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b
Explain how noise affect the performance of analog modulation systems.
5 marks

Answer

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OR
310 marks
a
List different types of noise that exist in communication systems. Discuss their sources.
5 marks

Answer

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b
Compute the noise figure of a communication system with three different stages with corresponding gains of G1, G2 and G3. Assume parameters necessary if any.
5 marks

Answer

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410 marks
a
Write short notes on power and bandwidth required for AM, DSB-SC signals.
5 marks

Answer

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b
Draw the waveform of AM signal for over modulation, under modulation and 100% modulation.
5 marks

Answer

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OR
510 marks
a
Differentiate between i) FM and PM ii) NBFM and WBFM.
5 marks

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b
A DSB-SC wave is demodulated by applying it to a coherent detector. Explain the effect of phase error in the locally generated carrier frequency at the detector end.
5 marks

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610 marks
a
State and explain Sampling Theorem for band limited signals.
5 marks

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b
Explain the principle of PAM generation with the help of a block diagram. Derive the mathematical expressions.
5 marks

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OR
710 marks
a
Explain in detail the Nyquist criterion for distortion less transmission of base band PAM signal.
5 marks

Answer

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b
Explain, how a PPM signal can be generated from PWM signal?
5 marks

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810 marks
a
Explain the functions of BPSK transmitter and receiver with the help of block diagrams.
5 marks

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b
What are the advantages and disadvantages of digital modulation schemes over analog modulation schemes.
5 marks

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OR
910 marks
a
Find the transmitted phase sequence for this input sequence: {b}={1,-1,1,- 1,-1,-1,1,1} and sketch the transmitted waveforms for BPSK.
5 marks

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b
Explain the procedure of coherent detection of signals in noise.
5 marks

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1010 marks
a
State and explain Shannon’s channel Capacity Theorem.
5 marks

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b
Calculate efficiency for the following message ensemble using Huffman code: [X] = [x1, x2, x3, x4, x5, x6, x7] [P] = [0.4, 0.2, 0.1, 0.08, 0.08, 0.08, 0.04]
5 marks

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OR
1110 marks
a
List out the conditions to classify Linear Block codes as Hamming Codes. Discuss error detection and correction capabilities of Hamming Codes.
5 marks

Answer

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b
Write how convolutional code for a given message sequence is generated with an example.
5 marks

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About this paper

This page contains the question paper of PRINCIPLES OF COMMUNICATIONS from JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD for B.Tech BME III Year I Semester, May - 2018, R13.

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