(SEM 2) THEORY EXAMINATION 2017-18 BASIC ELECTRONICS

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.
 

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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.
 

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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.
 

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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.