(SEM III) THEORY EXAMINATION 2021-22 ANALOG ELECTRONICS

This question paper is designed for students of B.Tech Semester III enrolled in the course Analog Electronics (KOE037). The paper aims to assess the student’s understanding of the fundamental concepts, analytical techniques, and circuit-level applications related to analog electronic devices and systems. It evaluates knowledge of diodes, BJTs, FETs, small-signal models, differential amplifiers, oscillators, feedback amplifiers, power amplifiers, and filter design, as well as the student’s ability to apply theoretical principles to solve numerical and analytical problems.

The exam covers a broad range of topics such as:

Diode circuits and hybrid-π models of BJT and MOSFET

Biasing schemes for BJT and FET amplifiers

High- and low-frequency behavior of amplifiers

Feedback and its effects on gain, impedance, and bandwidth

Oscillator circuits including RC phase shift, Wien bridge, and Colpitts oscillators

Differential amplifiers, CMRR, ICMR, and current mirrors

Power amplifiers (Class A, B, AB) and their efficiency

Precision rectifiers and integrators

Filter design including band-pass and order determination

The paper is divided into three sections (A, B, and C) ensuring assessment of conceptual clarity, derivation-based understanding, and advanced application:

Section A – Short Answer Questions (20 marks)

Tests basic conceptual understanding of diode circuits, hybrid-π models, biasing objectives, negative feedback, CMRR, ICMR, oscillator frequency, Barkhausen criteria, rectifiers, and integrator limitations.

Section B – Descriptive / Analytical Questions (30 marks)

Includes derivations, AC analysis, class-A power amplifier calculations, oscillator circuit derivations, current mirror topology, and summing amplifier analysis. Students must attempt any three questions.

Section C – Advanced Application Problems (50 marks)

Contains numerical and design-based questions such as:

Stability factor and Q-point calculations

High-frequency response and mid-band gain

Feedback amplifier analysis

RC/Wien/Colpitts oscillator design

Differential amplifier gain calculation

Schmitt trigger design

Band-pass filter design

This question paper thoroughly evaluates the student’s ability to analyze, design, and interpret analog electronic circuits, combining theoretical principles with practical problem-solving in electronic engineering.