Gujarat Technological UniversitySummer 2024 examination

GTU 3151104 Analog and Digital Communication Summer 2024 Question Paper & PDF

B.E. · EC Engineering · Semester 5 · Subject code 3151104
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Total
70 marks
To pass
23 marks (33%)
Duration
2.5 Hours 2:30 PM – 5:00 PM
Questions
5 with internal choice
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Q.1

14 Marks
(a)
3 marks
Explain the need of modulation.
(b)
4 marks

Justify: Noise immunity of digital communication system is better than analog communication system.

(c)
7 marks

What are the advantages of Single Side Band (SSB) modulation over Double Side Band (DSB) modulation? Explain filter method to generate SSB signal.

Q.2

14 Marks
(a)
3 marks

Explain the working of pre-emphasis network in Frequency Modulation.

(b)
4 marks
Compare: Amplitude Modulation and Frequency Modulation.
(c)
7 marks
Explain the working of Phase Locked Loop (PLL).
(c)
7 marks

Explain different types of signal distortions over a communication channel.

Q.3

14 Marks
(a)
3 marks

A broadcast AM transmitter radiates 50 KW of carrier power. What will be the radiated power at 85 % modulation?

(b)
4 marks

For baseband pulse 110100, draw the waveforms of ASK, FSK and PSK.

(c)
7 marks

Explain how FM signal is generated using Indirect method of Armstrong.

(a)
3 marks

An FM wave is given by e(t) = 20 cos[6 × 10⁸t + 7 sin1250t]. Determine

i)The carrier frequency
ii)Modulating frequency
iii)The maximum deviation.
(b)
4 marks
Compare binary ASK, FSK and PSK.
(c)
7 marks

Explain how the envelope detector demodulates AM signals. Also indicate the difference between the rectifier detector and the envelope detector.

Q.4

14 Marks
(a)
3 marks
Explain the principle of non uniform quantization.
(b)
4 marks
Explain the applications of Eye diagram.
(c)
7 marks
What is aliasing? How aliasing can be eliminated?
(a)
3 marks

Find the Nyquist rate and Nyquist interval for the signal x(t) = 10 cos3000πt cos1000πt

(b)
4 marks
Explain the properties of line codes.
(c)
7 marks

Explain the working of delta modulation with the help of block diagram. Discuss the disadvantages of delta modulation.

Q.5

14 Marks
(a)
3 marks
Compare: Unipolar, polar and bipolar line codes.
(b)
4 marks

What are the advantages of digital communication over analog communication?

(c)
7 marks
Derive the power spectral density (PSD) of polar NRZ line code.
(a)
3 marks

Explain the working of regenerative repeater in digital communication system.

(b)
4 marks
Explain the operation of sample and hold circuit.
(c)
7 marks

Explain the cause of intersymbol interference (ISI) in digital communication systems? Explain Nyquist criterion for zero ISI.

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About this paper

Official Gujarat Technological University (GTU) examination paper for Analog and Digital Communication (Summer 2024, B.E. · EC Engineering, Sem 5). Features complete 70-mark regular & remedial examination pattern, official marking distribution across all 5 questions, and direct 1-click official PDF download.

Transcribed for student exam preparation from Gujarat Technological University official examination archives. Questions, syllabus guidelines, and curriculum marking schemes remain the intellectual property of Gujarat Technological University.

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