# Basic Electrical Engineering

Sub Code : 10ELE15                               IA Marks : 25
Hrs/ Week : 04                                      Exam Hours : 03
Total Hrs. : 52                                       Exam Marks : 100

## PART – A

### UNIT – 1 1–a) D. C. Circuits:

Ohm’s Law and Kirchhoff’s Laws, analysis of series, parallel and series- parallel circuits excited by independent voltage sources.
Power and Energy. Illustrative examples.

4 hours

### 1–a) Electromagnetism:

Faradays Laws, Lenz’s Law, Fleming’s Rules,Statically and dynamically induced emf’s. Concept of self inductance, mutual
inductance and coefficient of coupling. Energy stored in magnetic field. Illustrative examples.

3 hours

### UNIT – 2 Single-phase A.C. Circuits:

Generation of sinusoidal voltage, definition of average value, root mean square value, form factor and peak factor of sinusoidally varying voltage and current, phasor representation of alternating quantities. Analysis, with phasor diagrams, of R, L, C, R-L, R-C and R-L-C circuits, real power, reactive power, apparent power and power factor. Illustrative examples involving series, parallel and series- parallel circuit

7 hours

### UNIT – 3 Three Phase Circuits

Necessity and advantages of three phase systems, generation of three phase power, definition of Phase sequence, balanced
supply and balanced load. Relationship between line and phase values of  balanced star and delta connections. Power in balanced three-phase circuits, measurement of power by two-wattmeter method. Illustrative examples

6 hours

### UNIT – 4 4–a) Measuring Instruments:

Construction and Principle of operation of dynamometer type wattmeter and single-phase induction type energy meter (problems excluded).

3  hours

### 4–b) Domestic Wiring:

Service mains, meter board and distribution board. Brief discussion on Cleat, Casing & Capping and conduit (concealed) wiring.
Two-way and three-way control of a lamp. Elementary discussion on fuse and Miniature Circuit Breaker (MCB’s). Electric shock, precautions against shock –Earthing: Pipe and Plate.

3  hours

## PART – B

### UNIT – 5 DC Machines:

Working principle of DC machine as a generator and a motor. Types and constructional features. emf equation of generator, relation
between emf induced and terminal voltage enumerating the brush drop and drop due to armature reaction. Illustrative examples.
DC motor working principle, Back emf and its significance, torque equation. Types of D.C. motors, characteristics and applications. Necessity of a starter for DC motor. Illustrative examples on back emf and torque.

7 hours

### Transformers

Principle of operation and construction of single-phase transformers (core and shell types). emf equation, losses, efficiency and
voltage regulation (Open Circuit and Short circuit tests, equivalent circuit and phasor diagrams are excluded). Illustrative problems on emf equation and efficiency only.

7 hours

### UNIT – 7 Synchronous Generators:

Principle of operation. Types and constructional features. emf equation. Concept of winding factor (excluding derivation of distribution and pitch factors). Illustrative examples on emf. equation.

6 hours

## Three Phase Induction Motors:

Concept of rotating magnetic field. Principle of operation. Types and Constructional features. Slip and its significance. Applications of squirrel – cage and slip – ring motors. Necessity of a starter, star-delta starter. Illustrative examples on slip calculations.

6 hours

### Text Books

1. “Basic Electrical Engineering”, D C Kulshreshtha, ,TMH,2009 Edition.

2.

“Fundamentals of Electrical Engineering”, Rajendra Prasad, PHI, Second Edition, 2009.

### Reference book

1. “Electrical Technology”, E. Hughes International Students 9th Edition, Pearson, 2005.

2. “Basic Electrical Engineering”,Abhijit Chakrabarti,Sudipta nath,Chandan Kumar Chanda,TMH,First reprint 2009.

3.  Problems in Electrical Engineering,Parker Smith,CBS Publishers and Distributors, 9th Edition,2003.