About this previous year paper
This question paper assesses a student’s understanding of the fundamental concepts of electrical engineering, including basic circuit theory, transformer principles, AC/DC machines, power calculations, phasors, batteries, earthing, and cable construction.
Students may answer in Hindi, English, or a mixed language as per convenience.
The paper is divided into three major sections — A, B, and C, containing conceptual, numerical, theoretical, and diagram-based questions.
SECTION A — Short Answer Questions (2 × 7 = 14 Marks)
This section requires short, precise responses to evaluate conceptual clarity in basic electrical engineering.
Topics Covered:
Unilateral vs Bilateral elements with examples
Active vs Passive elements
Ideal Voltage Source vs Ideal Current Source
RMS value of sinusoidal current calculation
No-load phasor diagram of a practical transformer
Different types of DC machines
SFU (Switch Fuse Unit) explanation
Real power consumption in a pure inductor with diagrams
These questions test basic definitions, understanding of components, and essential electrical fundamentals.
SECTION B — Descriptive / Analytical Questions (7 × any 3 = 21 Marks)
Students must answer any three questions. These require explanation, derivation, diagrams, and reasoning.
Topics Include:
Circuit Analysis
Using mesh or nodal method to find branch currents.
Series RLC Circuit
Derivation of:
Resonant frequency
Phasor diagram at resonance
Transformer Losses
Explanation of:
Iron loss
Copper loss
Stray loss
Dielectric loss
Methods to minimize transformer losses
EMF Equation of DC Generator
Full derivation with explanation of flux, speed, poles, and conductors.
Batteries
Types:
Primary
Secondary
Lead-acid
Nickel-cadmium
Lithium-ion
Explain any one with labelled diagram.
This section checks problem-solving ability, diagram understanding, and conceptual depth.
SECTION C — Long Answer / Application-Based Questions
(7 Marks × 3 Questions = 21 Marks)**
One question must be attempted from each part (3, 4, 5, 6, 7).
PART 3
(a) Mesh Analysis — Calculate currents in all branches
or
(b) Nodal Analysis — Determine branch currents and current through 2Ω resistor
This evaluates deep understanding of network analysis techniques.
PART 4
(a) Relationship between Phase & Line quantities in 3-Phase Star System
Includes:
Phasor diagram
Mathematical derivation
or
(b) Instantaneous & Average Power for R–L series AC Circuit
Includes:
Instantaneous power equation
Power waveform
PART 5
(a) Transformer Efficiency
Calculate efficiency at:
Full load, 0.8 power factor lagging
Half load, unity power factor
or
(b) Equivalent Circuit of Practical Transformer
Complete diagram and explanation of each parameter:
Copper resistance
Leakage reactance
Core loss component
Magnetizing branch
PART 6
(a) 3-Phase Induction Motor
Working principle + Slip–Torque characteristics
or
(b) DC Machine Numerical
Calculate useful flux per pole for given conductors, speed, poles, and generated EMF.
PART 7
(a) Construction of Four-Core Armoured XLPE Cable
Layers:
Conductor
Insulation
Inner sheath
Armour
Outer PVC sheath
Purpose of each layer explained
or
(b) Classification of Earthing
Based on purpose:
Equipment earthing
System earthing
Functional earthing
With examples
EXAM OBJECTIVE SUMMARY
This question paper assesses:
Understanding of basic electrical components
Circuit solving techniques (Mesh, Nodal)
AC fundamentals, RMS values, phasor diagrams
Transformer theory, losses, efficiency
DC generator EMF fundamentals
Induction motor slip–torque behaviour
Cable construction and earthing systems
Application-based problem solving