B.Tech (Semester II) | Theory Examination
Full Description of Question Paper (Long & Detailed)**
This document presents the complete and official Electrical Engineering (KEE-201) Theory Examination Question Paper for B.Tech Semester II, Total Marks: 100, Time: 3 Hours. The paper thoroughly evaluates a student's foundational understanding of electrical circuits, transformers, machines, power systems, basic protection devices, and essential electrical engineering concepts.
The structure of the question paper ensures a balanced assessment across definitions, conceptual clarity, numerical problem-solving, and applied engineering analysis.
SECTION A – Short Answer / Conceptual Questions (20 Marks)
This section contains 10 brief questions of 2 marks each, designed to test the student’s grasp of basic principles. Topics include:
Core Concepts Covered
Purpose of Earthing electrical appliances
Various 3-phase transformer connections (Star-Star, Delta-Delta, Star-Delta, etc.)
Why a transformer cannot operate on DC
Difference between primary & secondary batteries
Meaning of active vs. passive circuit elements
Star–Delta conversion
Phase angle in a purely capacitive circuit
Calculation of speed of a 3-phase induction motor
Condition for series resonance
Applications of synchronous motors
These conceptual questions ensure the student understands basic definitions and can express them clearly and concisely.
SECTION B – Descriptive / Numerical Questions (30 Marks)
Attempt any 3 (each 10 marks)
This section tests analytical ability, numerical accuracy, and engineering explanation skills.
Topics include:
Star–Delta Relationships
Derivation of the mathematical relationship between Delta and Star connected systems.
Power in Resistive AC Circuits
Students must derive average power formulas and draw phasor and waveform diagrams.
Transformer Numerical (Heavy Weightage)
A detailed numerical problem involving:
Equivalent resistance (primary ↔ secondary)
Equivalent reactance
Total impedance
Copper losses
Torque–Slip Characteristics of Induction Motor
Explanation and sketch of torque vs. slip curve
(starting torque, maximum torque, breakdown torque).
Protection Devices
Explanation of:
MCB
ELCB
MCCB
These questions test deeper understanding and the ability to connect concepts with real engineering systems.
SECTION C – Long Answer / Application-Based Questions (40 Marks)
Four sets; attempt one from each. Each carries 10 marks.
This section focuses on problem solving, derivations, and real-world application.
Set 1 – Network Theorems
Thevenin’s theorem (finding current through a resistor)
Superposition theorem with multi-source circuit
Set 2 – Electrical Machines
Why a single-phase induction motor is NOT self-starting
Explanation of:
Split-phase method
Capacitor-start
Capacitor-run
Shaded-pole
OR numerical on DC shunt motor
(Back EMF, generated EMF when used as generator)
Set 3 – Resonance / Three Phase System
Derivation of half-power frequencies, bandwidth, Q-factor in a series RLC circuit
OR three-phase load numerical:
Line current
Power factor
Total power
Reactive volt-amp
Volt-ampere rating
Set 4 – Transformer / Efficiency
Construction, advantages, disadvantages of an Autotransformer
OR transformer efficiency numerical:
Full load, half load
Lagging PF
Maximum efficiency condition
Set 5 – Batteries / Cables (Electrical Engineering Applications)
Electrical characteristics of Lead-Acid Battery
OR construction, rating & applications of wires and cables
These long-form questions check whether students can practically apply formulas, understand machine behavior, and solve engineering problems with proper methodology.
Sample Questions (from the actual paper)
To show the style and depth, here are two real sample questions directly from the exam:
Sample 1 (Section A):
“Define the purpose of Earthing the electrical appliances.”
Sample 2 (Section C):
“Derive half power frequencies, bandwidth and quality factor for series resonance occurring in a series RLC circuit.”
These reflect the mix of concise conceptual checks and deep analytical derivations present throughout the paper.
Overall Coverage of the Question Paper
This examination comprehensively tests a student’s knowledge across critical areas of electrical engineering:
Network Theory
Star–Delta conversions
Thevenin & Superposition Theorems
AC/DC analysis
AC Fundamentals
Resonance
Average power
Phasor diagrams
Electrical Machines
Transformers (equivalent circuits, losses, efficiency)
Induction motors (slip, torque characteristics)
DC motors & generators
Power Systems & Protection
Earthing
MCB, ELCB, MCCB
3-phase systems
Batteries & Cables
Lead-acid battery characteristics
Types of cables and applications
The structure ensures a balanced evaluation of definitions, theory, numericals, applications, and engineering diagrams.
