(SEM I) THEORY EXAMINATION 2022-23 FUNDAMENTALS OF ELECTRONICS ENGINEERING

This question paper evaluates a student’s theoretical and analytical understanding of basic electronic devices, circuits, number systems, operational amplifiers, modulation techniques, and digital logic design.
The paper can be answered in Hindi, English, or mixed language, making it flexible and student-friendly.

The paper is divided into three sections—A, B, and C—covering conceptual, numerical, and diagram-based questions.

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

This section contains seven brief questions, each testing essential concepts in electronics:

Avalanche Breakdown vs Zener Breakdown

Difference in mechanism, operating region, doping level, and temperature behavior.

Varactor (Varicap) Diode

Reason it is called “variable capacitance diode”.

Pinch-off Voltage

Definition of pinch-off condition in JFET.

Transistor Current Relations

Using α, IE to calculate IC and IB.

CMRR & Slew Rate of Op-Amp

Definitions of two important parameters in operational amplifiers.

Voltage Follower

Use of op-amp for unity gain buffer.

Power in AM Wave

Calculation of total power using carrier power & modulation index.

This section checks foundation-level clarity of semiconductor and analog electronics.

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

Students must answer any three detailed questions. Topics include:

p-n Junction Diode

Working principle and V–I characteristics with graph.

Bridge Rectifier

Neat circuit diagram, waveform explanation, and calculation of average voltage & current.

Output Voltage Calculation

Numerical question using circuit analysis (based on given Fig.1).

Universal Gates

Definition and implementation of AND, OR, NOR gates using only NAND gate.

AM (Amplitude Modulation) Numerical

Calculation of:

Modulation Index

Sideband frequencies

Sideband amplitudes

Bandwidth

Total transmitted power

This section evaluates understanding of circuit diagrams, waveforms, digital logic, and communication principles.

SECTION C – Long Answer / Analytical Questions (7 × 3 = 21 Marks)

Students answer one question from each part (3, 4, 5, 6, 7). These require detailed explanations, diagrams, and derivations.

PART 3

(a) Voltage Tripler circuit diagram & Zener diode as voltage regulator

or

(b) Working principles of LED and Photodiode with diagrams.

PART 4

(a) NPN Transistor in Common-Base configuration

Circuit diagram, working, input-output characteristics
or

(b) Depletion-Type MOSFET (n-channel)

Construction, working, and detailed characteristics.

PART 5

(a) Block diagram of Operational Amplifier & Ideal Characteristics

or

(b) Op-Amp as Integrator & derivation of output equation.

PART 6

(a) Boolean Function Minimization using K-Map

Implement simplified logic using gates
or

(b) Number System Conversions

Binary, decimal, octal, base conversion, 1’s and 2’s complement arithmetic.

PART 7

(a) AM Modulator & Block Diagram of Communication System

or

(b) Block Diagrams & Working of Satellite System and Radar System.