(SEM I) THEORY EXAMINATION 2018-19 BASIC ELECTRICAL ENGINEERING

This is a fully structured AKTU B.Tech First Year – Basic Electrical Engineering (BEE) question paper designed as per the official 100-mark university exam pattern. The paper is divided into Section A, Section B, and Section C, covering all major concepts of electrical circuits, AC/DC systems, transformers, DC machines, induction motors, power factor, resonance, network theorems, and household wiring systems.

This question paper is extremely useful for students preparing for semester exams, internal tests, assignments, viva exams, and for strengthening their understanding of core electrical engineering topics through numericals, phasor diagrams, derivations, and objective theory.

SECTION A – Short Questions (10 × 2 = 20 Marks)

This section covers the most important fundamentals of electrical engineering:

Active vs passive elements

Bilateral vs unilateral elements

Ideal voltage & current sources

Q-factor of series RLC circuit

Phasor representation of AC currents

Transformer behavior on DC supply

Changing direction of rotation of DC motor

Starting methods of single-phase induction motor

Why earth pin is bigger & thicker

Advantages of auto-transformer

Household energy consumption calculation

This section helps students quickly revise definitions, concepts, and reasoning-type questions.

SECTION B – Descriptive Questions (Attempt Any 3 × 10 = 30 Marks)

This section contains numericals, derivations, circuit analysis, and practical electrical engineering concepts:

Network Theorems

Find current through resistor using Superposition Theorem

Resonance in AC Circuits

Derive resonance frequency of series RLC

Calculate:

Capacitance at resonance

Voltage across capacitor

Q factor

Transformer Efficiency

100 kVA, 1100/440 V transformer efficiency calculation

Full-load & part-load efficiency at given power factors

DC Generator

Lap-connected 4-pole generator

Armature current & generated EMF with brush contact drop

Battery Characteristics

Charging/discharging behavior

Backup time for 100AH battery supplying 100W load

These questions cover all key electrical machines and circuit topics.

SECTION C – Long Questions (5 × 10 = 50 Marks)

Students must attempt ONE part from each question.

Q3 – Network Theorems

Norton's Theorem + current through resistor
OR

Mesh/Node analysis to find current in circuit

Q4 – AC Circuits & 3-Phase Systems

Derive parallel resonance & Q-factor
OR

Delta-connected 3-phase load

Line current

Power & power factor

Phasor diagram

Q5 – Transformers

Principle & operation of single-phase transformer

EMF equation derivation
OR

Voltage regulation definition, significance, ideal value

Q6 – DC Machines & Induction Motors

Derive EMF equation of DC generator + numerical
OR

Frequencies of stator & rotor current, slip calculations, rotor speed

Q7 – Electrical Devices & Wiring

Short notes on:

MCB

MCCB

Fuse

Types of wiring

Useful for electrical safety, domestic installations, and power distribution basics.