(SEM II) THEORY EXAMINATION 2021-22 EMERGING DOMAIN IN ELECTRONICS ENGINEERING

This document contains the complete and original B.Tech (Semester II) Theory Examination Question Paper for Emerging Domain in Electronics Engineering (Subject Code: KEC201T) for the 2021–22 academic session. The question paper is carefully structured to evaluate a student’s understanding of modern and emerging concepts in electronics engineering, including semiconductor devices, OP-AMP applications, number system conversions, logic gate realizations, FET technologies, analog modulation, communication systems, and power electronics fundamentals.

The paper is divided into three comprehensive sections, each designed to assess a combination of conceptual clarity, analytical ability, numerical computation, and practical understanding of electronic circuits and communication techniques.

SECTION A – Short Conceptual Questions (2 marks × 10 = 20)

This section consists of ten brief questions covering the fundamentals of semiconductor devices, analog electronics, digital circuits, and communication engineering. Major topics include:

Formation of depletion layer in a diode

Effect of temperature on diode characteristics

Difference between BJT and JFET

Calculation of βdc, ICBO, and transistor current relations

Meaning of CMRR in OP-AMP

Comparison between microprocessor and microcontroller

Number system conversions to unknown base

Truth tables of XOR and XNOR gates

Modulation transmission efficiency

Merits of satellite communication

These questions test foundational knowledge and short, direct conceptual understanding.

SECTION B – Analytical, Numerical & Application-Based Questions (10 marks × 3 = 30)

Students must attempt any three out of five questions. This section includes analytical explanations, circuit-based problems, and numerical calculations. Topics include:

Definition of clampers and output analysis of a given diode network

Working of common-base NPN transistor, with input/output characteristics and output current expression

Concept of virtual ground in operational amplifiers, along with output voltage calculation

Number system problems such as 2’s complement, decimal-to-hex conversion, binary addition, De Morgan’s laws, minterm & maxterm definitions

Detailed explanation of amplitude modulation, its total transmitted power, and modulation efficiency

This section evaluates a student’s problem-solving skills and understanding of electronic circuit behavior.

SECTION C – Long Descriptive & Technical Questions (10 marks × 4 = 40)

Each subsection requires attempting one question, covering advanced device operations, modulation math, logic realization, and MOSFET modeling.

Key areas include:

Q3 – Rectifier & Output Waveform Analysis

DC/RMS current, efficiency, and ripple factor of a bridge rectifier

Output voltage waveform analysis

Q4 – MOSFET Technologies

Working & transfer characteristics of enhancement MOSFET

Construction, operation & characteristics of P-channel depletion MOSFET

Justification of MOSFET as a voltage-controlled device

Q5 – OP-AMP Applications & Wireless Technologies

Non-inverting amplifier

Inverting summer

Bluetooth & Wi-Fi communication fundamentals

Output voltage calculation for a given OP-AMP network

Ideal OP-AMP characteristics

Q6 – Digital Logic Design

Realization of basic gates using NAND or NOR (universal gates)

K-map simplification and implementation of the minimized function using NAND gates only

Q7 – Analog Communication & Modulation

Need for modulation in communication systems

Percentage modulation using antenna current

AM modulation index, sideband amplitudes, total transmitted power, bandwidth & efficiency

Audio frequency and carrier frequency calculations

These questions test deep understanding of electronics engineering principles and their real-world applications.

Sample Questions from the Paper (1–2 included)

“Discuss the formation of depletion layer in diode.”
— A short theoretical question evaluating a student's fundamental semiconductor knowledge.

“Explain Amplitude Modulation. Derive the expression for the total power radiated by the modulated signal and calculate modulation efficiency.”
— A long analytical question testing understanding of analog modulation.

These examples represent the format and depth of questions across the paper.

Coverage of This Question Paper

The question paper covers the entire breadth of Emerging Electronics Engineering domains, including:

Diodes, transistors, BJT, JFET, MOSFET

OP-AMP circuits (inverting, non-inverting, summers, virtual ground)

Binary arithmetic, complements, number systems

Boolean algebra, De Morgan’s laws, minterms & maxterms

Truth tables, universal gates, NAND/NOR implementations

Clampers, bridge rectifiers, ripple factor

Modulation techniques (AM calculations, efficiency, bandwidth)

Wireless technologies: Bluetooth, Wi-Fi

Satellite communication merits

FET transfer characteristics

Logic minimization using K-map

Communication system fundamentals

This ensures complete mapping with the university syllabus and helps students understand both traditional and emerging areas of electronics.

Purpose of This Document

This question paper serves as a full academic resource for students preparing for Emerging Domain in Electronics Engineering examinations. It provides:

Understanding of exam pattern & marking scheme

Clarity on important topics and commonly asked questions

Strong foundation for problem-solving & numerical analysis

Balanced exposure to analog, digital, communication, and semiconductor technologies

The paper helps students analyze expected question types and prepare strategically for scoring high marks.