About this previous year paper
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.