(SEM II) THEORY EXAMINATION 2024-25 FUNDAMENTALS OF ELECTRONICS ENGINEERING

B.Tech (Semester II) Theory Examination 2024–25

Maximum Marks: 70 | Time: 3 Hours

Medium: Hindi / English / Mixed

This question paper evaluates students’ understanding of basic electronic devices, circuit analysis, digital electronics, and communication systems. It covers theoretical concepts, numerical analysis, circuit diagrams, logical reasoning, and Boolean simplification.

The paper is divided into three sections: A, B, and C, containing short, descriptive, and analytical questions.

SECTION A – Short Answer Questions (14 Marks | 7 × 2)

This section tests basic theoretical understanding and definitions.

Topics include:

Avalanche vs Zener breakdown

Pinch-off voltage in JFET

Op-amp input stage & differential amplifier

CMRR meaning & importance in instrumentation

NAND as universal gate & NOT implementation

1’s and 2’s complement

Frequency reuse in wireless systems

Focus: Concepts, definitions, comparison, short reasoning.

SECTION B – Descriptive Questions (21 Marks | Attempt Any 3)

This section checks conceptual clarity, diagrams, and analytical explanation.

Topics include:

PN junction formation + depletion width derivation

BJT construction, working, CE characteristics

Op-amp IC 741 diagram + equivalent circuit

Difference between POS & SOP + SOP conversion

Block diagram of communication system

Focus on illustrating concepts with diagrams and formulas.

SECTION C – Long Answer / Analytical Questions (35 Marks | 5 Questions, 7 Marks Each)

Application-based, numerical, derivation, and circuit-analysis questions.

Q3 — Rectifiers & Waveforms

Choose one:

Half-wave vs full-wave rectifier comparison + average/RMS current derivations

Numerical: Bridge rectifier (220V AC → transformer 10:1, capacitor 470μF → peak voltage, avg DC, ripple voltage)

Q4 — JFET or Transistor Current Relations

Choose one:

JFET working + input/output characteristics

Relation between α & β, calculation of IC, IE, β for given transistor

Q5 — Op-Amp Applications

Choose one:

Integrator & Differentiator circuits with waveforms + applications

Inverting / Non-inverting amplifier: design, working, gain derivations

Q6 — Digital Electronics

Choose one:

K-map minimization of 4-variable function

Boolean algebra theorems proof (3 expressions)

Q7 — Communication Systems

Choose one:

Need of modulation + AM definition, waveforms & modulation index derivation

Satellite communication: basic elements with diagrams