(SEM II) THEORY EXAMINATION 2024-25 FUNDAMENTALS OF ELECTRICAL ENGINEERING

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