What is the exam pattern and passing mark for GTU Principles of Communication (BE04000031)?

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 BE04000031 Summer 2026 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 2026 examination

GTU BE04000031 Principles of Communication Summer 2026 Question Paper & PDF

B.E. · EC Engineering · Semester 4 · Subject code BE04000031

Download official PDF View PDF here

Share with your class

Total: 70 marks
To pass: 23 marks (33%)
Duration: 2.5 Hours 10:30 AM – 1:00 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

Define communication system and explain it with the help of block diagram.

(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)

1Multi-tone modulation

2Self-capacitance of a coil

3Power Spectrum Density

4Image frequency

5Carson’s rule

Q.2

14 Marks

(a)

3 marks

Give Comparison between FM and AM system.

(b)

4 marks

Derive the total power of an AM wave in terms of carrier power and modulation index.

(c)

7 marks

An modulating signal 15sin(2π*1500t) amplitude modulates a carrier signal 60sin (2π*100,000t). Load resistance is 60Ω. Find

i)modulation index,

ii)Total power and

iii)Draw its frequency spectrum

iv)Total Bandwidth

iv)Transmission efficiency

vi)Transmitted current

(c)

7 marks

Discuss the basic principle of FM detection and explain Foster-seeley Discriminator

Q.3

14 Marks

(a)

3 marks

Differentiate SSB and VSB modulation.

(b)

4 marks

What do you mean by noise? Give classification of it. Briefly explain thermal noise.

(c)

7 marks

Define Noise factor. Derive the Friis’s formula for noise factor when amplifiers are in cascade connection.

(a)

3 marks

Explain Phase Modulation with necessary equation.

(b)

4 marks

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

(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

What is the significance of Amplitude limiter.

(b)

4 marks

Two resistors 15 kΩ and 30 kΩ are at room temperature (290K) for a bandwidth of 300 kHz. Calculate thermal noise for each resistor, if two resistors are in series.

(c)

7 marks

Draw block diagram of super heterodyne receiver and explain function of each block.

(a)

3 marks

Calculate the FM modulation index for a system having peak frequency deviation of 50 kHz and modulating frequency of 5 kHz.

(b)

4 marks

Find the fourier transform of :

1x(t)=δ(t)

2x(t)=e-atu(t)

(c)

7 marks

Define amplitude modulation. Derive its mathematical expression and draw its frequency spectrum. Draw its waveforms for under, perfect and over modulation.

Q.5

14 Marks

(a)

3 marks

Discuss about the Automatic Gain Control in brief.

(b)

4 marks

A certain AM transmitter radiates 10kW with the carrier unmodulated and 11.8kW when the carrier is sinusoidally modulated. Calculate the modulation index. If another sine wave corresponding to 40% modulation is transmitted simultaneously, determine the total radiated power.

(c)

7 marks

Draw and explain Series tuned circuits in detail. Derive its equation for Resonance frequency and Q-factor.

(a)

3 marks

Explain the transmission of a signal through LTI system.

(b)

4 marks

Discuss about the technology used in amateur radio.

(c)

7 marks

Draw and explain circuit of envelope detector for AM.

Other Semester 4 subjects

BE EC

BE04000041

Control Systems

BE04000051

Linear Integrated Circuits

BE04000061

Microcontroller

BE04000301

Electromagnetics

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 Principles of Communication (Summer 2026, B.E. · EC Engineering, Sem 4). 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 Principles of Communication Papers (1) →Report a typo or correction