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.

Where can I download the official GTU 3151104 Summer 2025 question paper PDF?

The official GTU question paper PDF is linked directly from Gujarat Technological University's official examination archive. You can view the full paper online or download the original file.

How can I practice solutions for these GTU questions?

Every question on UnFoldPrep includes deep-linking and one-click AI prompt buttons for ChatGPT, Claude, and Perplexity that instantly formulate structured exam prompts with standard mark breakdowns and academic rubrics.

Gujarat Technological UniversitySummer 2025 examination

GTU 3151104 Analog and Digital Communication Summer 2025 Question Paper & PDF

B.E. · EC Engineering · Semester 5 · Subject code 3151104

Download official PDF View PDF here

Share with your class

Total: 70 marks
To pass: 23 marks (33%)
Duration: 2.5 Hours 2:30 PM – 5:00 PM
Questions: 5 with internal choice

No solutions on this paper yetNeed them for your exam? Ask once. Papers that students ask for are solved first, and we aim to add them within 24 hours.

Q.1

14 Marks

(a)

3 marks

What do you mean by modulation index/modulation depth? Explain its significance in communication system.

(b)

4 marks

Explain Modulation process with its requirement in communication system.

(c)

7 marks

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

i)Multi tone modulation

ii)Scrambling

iii)Aliasing

iv)Frequency Division Multiplexing

v)Phase modulation

vi)DSBSC

vii)Sideband splatter in amplitude modulation

Q.2

14 Marks

(a)

3 marks

Why pre-emphasis and de-emphasis are used in FM transmitter and receiver?

(b)

4 marks

Draw and explain the basic block diagram of communication system.

(c)

7 marks

A modulating signal 10sin (2π*500t) is used to amplitude modulates a carrier of 50sin (2π*100000t). Find

i)modulation index,

ii)sideband frequencies,

iii)amplitude of both side bands,

iv)Total Bandwidth,

v)Total power delivered to load of 600Ω,

vi)power in carrier signal,

vii)power in one sideband.

(c)

7 marks

Explain amplitude modulation with its mathematical expression and frequency spectrum. Draw its waveforms for under, perfect and over modulation.

Q.3

14 Marks

(a)

3 marks

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

(b)

4 marks

Amplitude Modulated wave has maximum and minimum amplitudes are measured as 7.2 V and 1.8 V respectively. Calculate its modulation index and transmission efficiency.

(c)

7 marks

List the methods used to generate SSB modulation signal. Discuss any one method in detail.

(a)

3 marks

Discuss about Carson’s rule.

(b)

4 marks

Explain vestigial sideband (VSB).

(c)

7 marks

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

Q.4

14 Marks

(a)

3 marks

Differentiate between RZ and NRZ line codes.

(b)

4 marks

Derive the Expression of quantization error.

(c)

7 marks

Differentiate Delta modulation and Adaptive delta modulation.

Discuss the condition for avoiding slope overload error?

(a)

3 marks

Why pulse shaping is required?

(b)

4 marks

Explain in brief Amplitude Shifting Keying (FSK) technique and list the applications of it.

(c)

7 marks

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

Q.5

14 Marks

(a)

3 marks

State and prove sampling theorem in time domain.

(b)

4 marks

List the advantages of digital communication over analog communication.

(c)

7 marks

Explain Time Division Multiplexing for PCM in T1 carrier systems.

(a)

3 marks

Compare Polar, Bipolar signaling with respect to desirable properties of line codes.

(b)

4 marks

Explain companding process in PCM and state the different laws for companding.

(c)

7 marks

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

More Analog and Digital Communication papers

Questions repeat across sessions. Working through two or three papers shows you which topics GTU asks most.

Summer 202670 marks · 5 questions

Winter 202570 marks · 5 questions

Summer 202470 marks · 5 questions

Other Semester 5 subjects

BE EC

2151101

Audio Video Systems

3151103

Principles of Management

3151105

VLSI Design

3151106

Power Electronics

Preparing with friends?

Send this paper to your class group. Every question has its own link.

About this paper

Official Gujarat Technological University (GTU) examination paper for Analog and Digital Communication (Summer 2025, 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.

Download official PDF All Analog and Digital Communication Papers (4) →Report a typo or correction