About this previous year paper
This document contains the complete Basic Electronics (REC201) Theory Examination Paper for B.Tech Semester II, conducted in the academic year 2017–18, with a total of 70 marks and an exam duration of 3 hours. It covers essential foundational and advanced topics in electronics, designed to evaluate a student's conceptual understanding, numerical solving skills, and analytical abilities.
BASIC-ELECTRONICS-REC201-1
The paper is divided into three structured sections:
SECTION A – Short Conceptual Questions (14 Marks)
This section includes seven brief questions focusing on core electronics fundamentals such as:
Relationship between α (alpha) and β (beta) of a transistor
Diode current equation and forward-bias voltage
Lissajous patterns and frequency measurement using CRO
Operation of LED, and FET as a voltage-variable resistor
Op-amp integrator/differentiator circuits
AM modulation index calculation
These questions test clarity of concepts and definitions.
BASIC-ELECTRONICS-REC201-1
SECTION B – Descriptive & Numerical Questions (21 Marks)
Students must attempt any three detailed questions covering:
Full-wave bridge rectifier operation, waveforms, PIV, ripple factor & efficiency
Clipper circuits and waveform representation
CB configuration of BJT with characteristics
CRO operation, phase & frequency measurement
Op-amp basics, block diagram, characteristics, and equivalent circuit
This section evaluates analytical understanding and practical circuit knowledge.
BASIC-ELECTRONICS-REC201-1
SECTION C – Long Analytical / Derivation-Based Questions (35 Marks)
This section includes one question from each part and covers advanced electronics topics:
Part 1 – Zener Regulation & Tunnel Diode
Voltage regulation using Zener diode, load line analysis, power rating
Construction, working, and I-V characteristics of a tunnel diode
Part 2 – FET Biasing & Diode Wave-Shaping
JFET bias calculation using voltage-divider bias
Waveform determination, DC level, and PIV computation
Part 3 – MOSFET & Op-Amp Applications
Operation and characteristics of N-channel depletion MOSFET
Op-amp integrator circuit and output voltage calculation
Part 4 – Communication Systems & Clamper Circuits
Amplitude modulation derivation and sideband frequency calculations
Positive/negative clampers and waveform sketching
Part 5 – DMM & Modulation Techniques
Construction and working of Digital Multimeter (DMM)
Comparison of AM, FM, and PM, and explanation of DSB-SC
This section tests derivation skills, deep conceptual clarity, and problem-solving abilities.
BASIC-ELECTRONICS-REC201-1
FINAL SUMMARY
Overall, this examination paper comprehensively assesses key areas of Basic Electronics, including semiconductors, diodes, BJTs, FETs, CRO, op-amps, MOSFETs, communication systems, wave shaping circuits, and digital measuring instruments. It serves as a valuable academic resource for students, educators, and exam preparation.