B.Tech (Semester II) Theory Examination 2024–25
Maximum Marks: 70 | Time: 3 Hours
Medium: Hindi / English / Mixed
This question paper examines a student’s fundamental understanding of basic electrical laws, AC/DC circuits, transformers, electrical machines, and power systems. It covers conceptual, numerical, analytical, and diagram-based questions.
The paper is divided into three sections: A, B, and C, ensuring evaluation from basic concepts to detailed problem-solving.
SECTION A – Short Answer Questions (14 Marks | 7 × 2)
Covers basic definitions, laws, and direct conceptual reasoning.
Topics include:
Kirchoff’s Current Law (KCL) & Kirchoff’s Voltage Law (KVL)
Ideal voltage & current sources
Average power in pure capacitive circuits
Proof of zero average power in pure inductors
Phasor diagram of a two-winding transformer (no-load)
Slip and rotor current frequency in induction motor
SFU (Switch Fuse Unit) explanation
Focus: Basic law explanation, circuit behaviour & simple definitions.
SECTION B – Descriptive Questions (21 Marks | Attempt Any 3)
Focuses on derivations, circuit analysis, machine principles & diagrams.
Topics include:
Nodal analysis in multi-resistor circuits
Resonance in series RLC circuit + phasor relationships
Working principle & EMF equation of transformer
Torque equation derivation for DC machines
Types of batteries with diagram of any one
These questions test understanding of formulas, steps, and electrical characteristics.
SECTION C – Long Answer / Analytical Questions (35 Marks | 5 Questions, 7 Marks Each)
Application-based circuit analysis, numerical problem-solving, and electrical machine characteristics.
Q3 — Mesh or Nodal Analysis
Choose one:
Current in a resistor using mesh analysis
Branch currents using nodal analysis
Q4 — Power in AC Circuits / 3-Phase Calculations
Choose one:
Instantaneous & average power expressions for R, L, C with waveform
3-phase load calculation: line voltage, line current, power factor & total power
Q5 — Transformer Losses & Efficiency
Choose one:
Types of transformer losses & their minimization techniques
Efficiency of transformer at full-load/half-load (numerical)
Q6 — Electrical Machines
Choose one:
Torque–slip characteristics of 3-phase induction motor with diagram
EMF calculation for a DC machine (useful flux per pole)
Q7 — Protection & Earthing
Choose one:
Working principle of MCB with circuit diagram
Earthing classification based on purpose with examples
