Electric System and Machines
Course Objective:
After completion of this course the student will be able to understand the fundamentals of electrical supply, measurement, safety, protection and machines.
 Introduction to supply and distribution (6 hours)
 Introduction to electrical supply & distribution
 Introduction to electrical installation
 Wiring material and accessories
 Control & protection
 Earthing of installation
 Electrical measurements (2 hours)
 Introduction
 Electrical measuring instruments
 Electrical maintenance & safety ( 4 hours)
 Electric shocks, effect & precaution
 Electrical maintenance and care
 Safe use of electricity
 Electromagnetism (4 hours)
 Introduction
 Magnetic field due to electric current
 Force on current carrying conductor
 Force between parallel conductor
 Torque experienced by the coil
 Electromagnetic induction
 Statically & Dynamically induced EMF
 Magnetic circuits (3 hours)
 Introduction
 Magneto motive force
 Magnetic circuit theory
 Self & mutual inductance
 Transformer (7 hours)
 Introduction
 Working principle of transformer
 Transformer construction
 Types of transformer
 Transformer at load and no load condition
 Voltage regulation of a transformer
 Types of losses and Efficiency of a transformer
 Threephase transformer
 Generators (6 hours)
 Introduction
 Construction of generator
 Operating principle of generator
 EMF equation
 Types of generator
 Uses of different types of generator
 Generator ratings
 Diesel generator set use and maintenance
 D.C. motors (4 hours)
 Introduction
 Working principle of d.c. motor
 Construction of d.c. motor
 Types of d.c. motor and their uses
 D.C. motor connection
 A.C. motors (5 hours)
 Introduction
 Operating principle of induction motor
 Construction of induction motor
 Connection for starting, reversing and speed changing of 3phase induction motor
 Methods of power factor improvement
 Synchronous motors
 Single phase motors (2 hours)
 introduction
 AC series motor
 Universal motor
 Stepper motor
 Application of single phase motors
 Selection of Electric motors (2 hours)
 Electric Characteristics
 Types of Enclosures
 Size and Ratings
 Estimation of Motor Ratings
Practical:
 Load test on a single phase transformer
 To determine the polarity of the primary and secondary winding
 To find the turnsratio
 To determine the efficiency at different loads
 To determine the voltage regulation
 Open circuit and short circuit test on a single phase tansformer
 To find efficiency at various load
 To find the load at which efficiency is maximum
 To calculate the voltage regulation at full load at p.f. i) 0.85 lagg and ii) 0.85 lead.
 Study of constructional details and starting of d.c. machine
 To study the constructional features of a d.c. machine
 To measure winding resistance
 To start and reverse the direction of the rotation of a d.c. motor
 Speed control of a d.c. shunt motor
 To plot the speed versus field current characteristics curve for a d.c shunt motor
 To plot the speed versus armature voltage characteristics curve for a d.c. shunt motor
 Threephase induction motor starter
 To study the various types of threephase induction motor starter
 Autotransformer starter
 Stardelta starter
 DOL starter
 Load test on three phase induction motor
 Compute, torque, output power, input power, efficiency, input power factor and slip for various load settings
 To plot the following curves from the data obtained in part (6.1)
 Efficiency vs output power
 Torque vs output power
 Line current vs output power
 Power factor vs output power
 Slip vs output power
References
 D.C. Kulshreshtha “Basic Electrical Engineering” Tata McGraw Hill Private limited, New Delhi 2010
 B.R.Gupta & Vandana Singhal “ Fundamentals of Electric Machines” New age international publishers, New Delhi 2005
 Dr. N.K. Jain “ A text book of practical in Electrical Engineering”, Dhanpat Rai Publishing Company,New Delhi 2002
Evaluation Scheme:
The questions will cover all the chapters of the syllabus. The evaluation scheme will be as indicated in the table below:
Chapters 
Hours 
Marks distribution* 
1 
6 
12 
2 & 3 
6 
12 
4 & 5 
7 
12 
6 
7 
12 
7 
6 
8 
8 
4 
8 
9 
5 
8 
10 & 11 
4 
8 
Total 
45 
80 
*Note: There may be minor deviation in marks distribution.
