What is the exam pattern and passing mark for GTU Analog and Digital Communication (3151104)?

The GTU theory examination carries 70 total marks with a duration of 2.5 Hours. Minimum passing criteria is 23 marks (33%). The paper consists of 5 main questions with official marking breakdown and internal choices.

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Gujarat Technological UniversitySummer 2026 examination

GTU 3151104 Analog and Digital Communication Summer 2026 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

Discuss the advantages and disadvantages of Frequency Modulation over Amplitude Modulation.

(b)

4 marks

Define Following Terms: (Draw diagram and write equations if any)

i)Sideband splatter in amplitude modulation

ii)Single tone modulation

iii)Carrier swing

(c)

7 marks

Draw and explain the block diagram of Analog and Digital communication system.

Q.2

14 Marks

(a)

3 marks

What do you mean by Frequency Division Multiplexing?

(b)

4 marks

Explain vestigial sideband (VSB).

(c)

7 marks

An AM signal is represented by e (t)= 7.5 (1 + 0.5 sin (5027*t)) cos (10053 * 1000*t). Calculate its

i)Carrier frequency

ii)Modulation index

iii)Amplitude of modulating signal

iv)Frequency of LSB and USB

v)Amplitude of LSB and USB

vi)Transmission efficiency

vii)Total power delivered to load of 600Ω.

(c)

7 marks

Explain the indirect method of generating FM signal with block diagram. Derive its relevant mathematical expression.

Q.3

14 Marks

(a)

3 marks

Differentiate between Wideband frequency modulation and Narrowband frequency modulation.

(b)

4 marks

A carrier wave is represented by equation 12sin(2πft). Draw the wave-forms of Amplitude Modulation wave for depth of modulation of

i)1

ii)0.5

iii)3/2.

(c)

7 marks

Enlist the methods used to generate Single Side Band modulation signal. Discuss any one method in detail.

(a)

3 marks

Compare DSBFC and DSBSC of amplitude modulation.

(b)

4 marks

Discuss the significance of pre-emphasis and de-emphasis in FM transmitter and receiver?

(c)

7 marks

Derive the mathematical expression of normal amplitude modulation and draw its and frequency spectrum. Derive its equation of transmitted power.

Q.4

14 Marks

(a)

3 marks

State and prove sampling theorem in time domain.

(b)

4 marks

Discuss Modulation with its need for communication.

(c)

7 marks

Draw Eye diagram. Show the significance of it in the pulse detection technique?

(a)

3 marks

What do you mean by modulation index of frequency modulation?

(b)

4 marks

Explain in brief Frequency Shifting Keying (FSK) technique and enlist its applicationsa

(c)

7 marks

Explain the different type of line coding techniques with suitable diagrams.

Q.5

14 Marks

(a)

3 marks

Define the following terms:

i)Scrambling

ii)Slope overloading

iii)Sample and Hold

(b)

4 marks

Derive the Expression of quantization error.

(c)

7 marks

Draw the block diagram of regenerative repeater and briefly explain the function of each block.

(a)

3 marks

Compare Differential Pulse Code Modulation and Pulse Code Modulation.

(b)

4 marks

Draw the signals for Unipolar NRZ, Unipolar RZ, Polar NRZ and polar RZ for data stream 10110011.

(c)

7 marks

Explain Inter symbol interference in digital communication and how to achieve zero ISI.

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About this paper

Official Gujarat Technological University (GTU) examination paper for Analog and Digital Communication (Summer 2026, 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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