(SEM I) THEORY EXAMINATION 2023-24 FUNDAMENTALS OF ELECTRONICS ENGINEERING

This question paper aims to assess students’ understanding of basic analog electronics, digital electronics, semiconductor devices, operational amplifiers, and communication engineering fundamentals. The exam is divided into three sections (A, B, and C) to evaluate conceptual clarity, analytical skills, programming in Boolean logic, circuit interpretation, and communication system fundamentals.

SECTION A — Short Answer Questions (2 × 7 = 14 Marks)

This section evaluates foundational knowledge of electronics through seven brief questions.

Topics Covered:

1. Semiconductor Devices

Difference between P–N junction diode and LED

Why BJT is a current-controlled device

JFET vs MOSFET comparison

2. Digital Electronics

Binary addition of fractional numbers

Boolean function simplification using Boolean algebra

3. Analog Electronics

Concept of virtual ground in op-amp

Applications of satellite communication

This section checks the student’s ability to explain core concepts in concise form.

SECTION B — Descriptive Questions (7 × choose any 3 = 21 Marks)

Students must attempt any three questions, each requiring explanation, diagrams, calculations, or conversions.

Topics include:

1. Diode Characteristics

Static vs dynamic resistance

Transition vs diffusion capacitance

2. BJT Working

Working of PNP transistor in CB configuration

Input/output characteristic curves

3. Differential Amplifier & CMRR

Concept of common-mode rejection ratio

Output voltage calculation based on gain and CMRR

4. Number System & Digital Design

Conversions:

Decimal to binary

Binary to decimal

Hexadecimal to octal

2’s complement subtraction

Designing AND, OR, NOT using NOR gates (universal gate concept)

5. Communication System

Need and purpose of modulation

This section tests analytical thinking, problem solving, numerical conversions, and circuit understanding.

SECTION C — Long Answer Questions (7 marks each)

Each block contains two questions; the student must attempt one question from each block.

Question 3 — Field Effect Transistors

3(a) N-channel JFET

Requires:

Construction

Working principle

Drain and transfer characteristics

3(b) P-channel Depletion MOSFET

Requires:

Device structure

Working

Transfer and output characteristics

Focus: device physics and graph interpretation.

Question 4 — Network Output Analysis

Students must determine and draw output waveform for a given electronic network, evaluating:

Circuit understanding

Input-output relationship

Waveform drawing ability

This block assesses circuit analysis and waveform interpretation skills.

Question 5 — Operational Amplifiers

5(a) OP-Amp Subtractor

Circuit diagram

Principle of differential subtraction

Output voltage derivation

5(b) Network Output Calculation

Requires analyzing an OP-amp or linear circuit to calculate output.

Focus: analog circuit design & equations.

Question 6 — Digital Circuit Design Using K-Map

6(a) SOP Form Simplification

Simplify using K-map

Implement using only NAND gates

6(b) POS Form Simplification

Minimize Boolean function

Implement using only NOR gates

This tests:

K-map mastery

Universal gate implementation

Simplified digital logic design

Question 7 — Communication Engineering

7(a) AM Theory Derivation

Derive expressions for:

Sideband amplitude

Sideband frequencies

Modulation index

Modulation efficiency

7(b) Short Notes

Amplitude modulation technique

Radar communication basics

This section evaluates understanding of modulation, frequency analysis, and communication fundamentals.

Overall Purpose of the Question Paper

This exam is designed to ensure students develop a strong foundation in:

Semiconductor device concepts
Transistor operation and characteristics
OP-amp basics and applications
Digital logic fundamentals and number system conversions
K-map simplification and universal gate implementation
Analog and digital circuit analysis
Basic communication engineering principles

The paper tests both theoretical knowledge and practical analytical skills, preparing students for advanced electronics, digital communication, and circuit design courses.