THEORY EXAMINATION (SEM–II) 2016-17 BASIC ELECTRICAL ENGINEERING

This document contains the full B.Tech Electrical Engineering Semester Examination Question Paper, designed for a maximum of 100 marks with a duration of 3 hours. The paper thoroughly evaluates a student’s conceptual understanding, analytical skills, numerical problem-solving ability, and knowledge of core electrical engineering principles. It is divided into three major sections: Section A, Section B, and Section C, with questions ranging from basic definitions to advanced calculations and theoretical explanations.

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

This section includes ten short and precise conceptual questions that test fundamental understanding of electrical engineering basics. Topics include:

Unilateral and bilateral elements

Advantages of three-phase systems

Reason for calling series resonance voltage resonance

Definition of acceptor and rejector circuits

Importance of damping torque in analog instruments

Concept of phase sequence in three-phase supply

Minimizing hysteresis losses in transformers

Function of commutator in DC generator

Motors used for constant speed applications

Role of condenser in ceiling fans

These questions ensure the student has a strong theoretical foundation before moving to larger problems.

SECTION B – Five Numerical/Analytical Problems (5 × 10 = 50 marks)

Students must attempt any five out of eight 10-mark questions. These require deeper calculations and application-based solutions. Topics include:

Finding current using mesh (loop) analysis and node voltage method

Solving a parallel AC circuit for branch currents, total current, power factor, and impedance

Definition, causes, effects, and improvement of power factor

Complete analysis of a Series R–L–C resonant circuit, including resonance frequency, Q-factor, bandwidth, and half-power frequencies

Discussing transformer losses, efficiency, and maximum efficiency conditions

Construction, working, advantages, and disadvantages of moving iron instruments

Calculations related to a dc shunt machine working as generator and motor

Working principle and torque-slip characteristics of three-phase induction motor

This section tests numerical accuracy, electrical calculation techniques, and the student’s ability to analyze real engineering circuits.

SECTION C – Long Answer Questions (2 × 15 = 30 marks)

Students must attempt any two of the three long questions. These require detailed explanations, derivations, and numerical solutions. Topics include:

Q3 – Maximum Power Transfer Theorem

Statement, proof, and numerical application

Determining the value of load resistance (R) for maximum power

Calculating maximum power delivered to the load

Q4 – Quality Factor & Bandwidth + Two-Wattmeter Method

Detailed discussion on Q-factor, bandwidth, and their significance

Using two-wattmeter readings to compute:

Circuit power factor

Active & reactive power

Line current

Per-phase impedance

Q5 – Moving Coil Instrument + Double Revolving Field Theory

Designing a voltmeter using a moving coil instrument

Full-scale calculation for series resistance

Explanation of double-field revolving theory (used in induction motors)

Applications of three-phase synchronous motors

This section evaluates higher-order thinking, conceptual clarity, and the ability to connect theory with practical engineering problems.