(SEM II) THEORY EXAMINATION 2021-22 BASIC ELECTRICAL ENGINEERING

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This document contains the complete and original B.Tech (Semester II) Theory Examination Question Paper for Basic Electrical Engineering (Subject Code: KEE201T) for the 2021–22 academic session. The paper has been carefully designed to evaluate a student’s understanding of essential electrical engineering principles, including AC/DC circuits, electrical machines, transformers, network theorems, power calculations, battery characteristics, and wiring systems.

The examination is structured into three major sections, each assessing the student’s conceptual knowledge, numerical ability, analytical thinking, and practical understanding of electrical engineering applications.

SECTION A – Short Conceptual Questions (2 marks each)

This section includes ten brief questions covering foundational concepts of electrical engineering. Topics include:

V–I characteristics of ideal voltage and current sources

Importance of linearity in circuits

Use of sinusoidal waveforms to represent AC

Why average power is zero in purely inductive circuits

Nature of load that gives negative voltage regulation in transformers

Phasor diagram of an ideal transformer on no load

Expression of generated EMF in a DC generator

Why a synchronous motor is doubly excited

Common problems during electrical installations

Battery characteristics, including definitions

These questions test quick recall and clarity of basic theoretical knowledge.

SECTION B – Analytical, Numerical & Descriptive Questions (10 marks each)

Students must attempt any three out of five questions. This section emphasizes derivations, numerical problem-solving, practical applications, and comparative study. Key topics include:

Equivalent resistance using star–delta or delta–star conversion

Resonant frequency, quality factor (Q), voltage and current calculations in RLC tank circuits

Efficiency and copper losses in single-phase transformers

Factors affecting speed of DC motors and comparison of lap vs. wave winding

Characteristics and backup time calculation of batteries

This section develops the student’s analytical ability and engineering problem-solving skills.

SECTION C – Long Descriptive & Technical Questions (10 marks each)

Each subsection requires the student to attempt one question, covering advanced reasoning, machine theory, and real-world electrical system applications.

Topics include:

Application of Norton’s theorem and Nodal analysis for current calculation

Mathematical derivation of dynamic impedance (ZD) of parallel RLC circuits with phasor diagram

Power factor, total current, and power absorbed by parallel AC circuits

Purpose and development of the approximate equivalent circuit of transformers

Detailed transformer calculations: equivalent resistance, reactance, impedance, copper loss, supply current

Derivation of torque equation of DC motor and calculations of brush voltage & back EMF

Comparison of induction motor vs. transformer

Energy consumption and electricity bill calculations using daily load usage

Construction, ratings, and applications of wires and cables used in electrical installations

These questions deeply evaluate understanding of machine theory, AC/DC performance, circuit analysis, and electrical equipment design.

Sample Questions from the Paper (1–2 included)

“Draw the V-I characteristics for an ideal voltage source and ideal current source.”
— A conceptual question demonstrating understanding of basic source behavior.

“Derive mathematically dynamic impedance (ZD) of a parallel RLC circuit under resonance and draw its phasor diagram.”
— A long analytical question assessing AC circuit theory.

These examples represent the type and depth of questions throughout the examination.