(SEM I) THEORY EXAMINATION 2017-18 BASIC ELECTRICAL ENGINEERING

This is the complete AKTU B.Tech First Year – Basic Electrical Engineering (BEE / EEE) question paper designed as per the latest university pattern. The paper covers fundamentals of DC circuits, AC circuits, transformers, induction motors, DC machines, power measurement, magnetic circuits, and network analysis.

The question paper is divided into three structured sections – A, B, and C, consisting of short, medium, and long questions. It is perfect for preparing for semester exams, assignments, viva, and last-minute revision.

SECTION A – Short Answer Questions (7 × 2 = 14 Marks)

This section tests basic understanding of electrical engineering concepts:

Ideal current source vs practical voltage source

Total 3-phase power of a Y-connected balanced load

Active vs passive elements; bilateral vs unilateral elements

Why series resonant circuit acts as an acceptor circuit and parallel resonance as rejecter circuit

Why transformers cannot work on DC supply

Power factor of impedance (3 + j4) Ω

Slip and slip speed in induction motors

These questions help students revise key definitions and formulas quickly.

SECTION B – Descriptive Questions (Attempt Any 3 × 7 = 21 Marks)

Mesh Analysis

Calculate current through a given resistor using mesh equations.

AC Resonance

Derive bandwidth of a series RLC circuit and explain the relationship between Q-factor and bandwidth.

Two-Wattmeter Method

Derive the formula for 3-phase power using two wattmeters and explain reading interpretation with phasor diagrams.

Transformer Efficiency

Given KVA rating and losses, calculate:

Half-load efficiency at unity power factor

Full-load efficiency at 0.8 pf lag

Load at which maximum efficiency occurs

Maximum efficiency value

DC Motor

Draw construction, explain working principle, and list applications of DC motor.

This section prepares students for numerical and conceptual problem-solving.

SECTION C – Long Questions (7 Marks Each)

Q3 – AC Waveforms / Network Conversion (Attempt Any 1)

Calculate average value, RMS, form factor, and peak factor of a given periodic waveform
OR

Derive star-delta and delta-star transformation relationships

Q4 – Phasors / RL Circuit (Attempt Any 1)

Explain phasors and derive voltage-current relationship for pure R, L, and C circuits
OR

Given 200 V supply & RL circuit details, find:

Inductance

Power factor

Voltage across coil

Q5 – Power Factor / Delta Load / Meters (Attempt Any 2)

Causes of low power factor + methods of power factor improvement

3 identical coils (8 + j6) Ω in delta on 400 V → Find:

Line current

Power factor

Active & reactive power

Total kVA

Moving-coil ammeter: convert 15 µA meter to 1A range → Find required shunt

Q6 – Magnetic Circuits / Transformer / Analogy (Attempt Any 2)

Analogy between magnetic and electric circuits

Iron ring with gap: find MMF, reluctance, flux, flux density

Working of single-phase transformer + condition for maximum efficiency

Q7 – Induction Motor / DC Generator (Attempt Any 1)

Torque-slip characteristics + numerical to find slip and number of poles
OR

EMF equation of DC generator + characteristics of series motor + numerical on power developed

Why This Question Paper Is Highly Useful for Students

Matches the exact AKTU format with CO (Course Outcomes)

Includes all important topics repeatedly asked in exams

Mix of short, numerical, derivation, and conceptual questions

Helps students master fundamentals of AC/DC circuits, machines, and power systems

Ideal for last-minute exam preparation

Perfect for B.Tech 1st year students across all branches — CSE, IT, ME, EE, ECE, CE, AI/ML, etc.