Page 1 SEMESTER FOURTH DEE401 ELECTRICAL MACHINES – I L3:T0:P0 RATIONALE Electrical machines is a subject where a student will deal with various types of electrical machines which are employed in industries, power stations, domestic and commercial appliances etc. After studying this subject, an electrical diploma holder must be competent to repair and maintain these machines and give suggestions to improve their performance. Practical aspects of the subject will make the students capable of performing various tests on the machines as per latest BIS specifications DETAILED CONTENTS Unit-1 DC Generators: Main constructional features of DC machines, working principle, Types of armature winding, Function of the commutator for generation action , Factors determining induced emf ,Types of dc generation on the basis of excitation, voltage built up in a dc shunt generator, Armature Reaction , Commutation methods to improve commutation . Unit-2 DC Motors: Performance and characteristics of different types of DC motors Function of the commutator for motoring action, Significance of back emf., the relation between back emf and Terminal voltage, Speed control of dc shunt/series motors , Need of starter, three point dc shunt motor starter and 2 point starter, Applications of DC motors, Losses in a DC machine, Determination of losses by Swinburne’s test Unit-3 Single Phase Transformers: Introduction , Constructional features of a transformer and parts of transformer , Working principle of a transformer, EMF equation, Transformer on no-load and its phasor diagram ,Transformer – neglecting voltage drop in the windings – Ampere turn balance – its phasor diagram ,Mutual and leakage fluxes, leakage reactances, Transformer on load, voltage drops and its phasor diagram , Equivalent circuit, Relation between induced emf and terminal voltage, regulation of a transformer- mathematical relation, Losses in a transformer Unit-4 Transformers Tests: Open circuit and short circuit test. Calculation of efficiency, condition for maximum efficiency-maintenance of Transformer, scheduled Maintenance, Auto-transformer construction, saving of copper, working and applications, Different types of transformers including dry type transformer. Unit -5 3-Phase Transformers: Construction of three phase transformers and accessories of transformers such as Conservator, breather, Buchholz Relay, Tap Changer (off load and on load) (Brief idea), Types of three phase transformer i.e. delta-delta, delta-star, star Delta and star-star, Conditions for parallel operation (only conditions are to be studied) , On load tap changer, Difference between power and distribution transformer, Cooling of transformer
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Page 1
SEMESTER FOURTH
DEE401 ELECTRICAL MACHINES – I L3:T0:P0
RATIONALE
Electrical machines is a subject where a student will deal with various types of electrical machines which
are employed in industries, power stations, domestic and commercial appliances etc. After studying this
subject, an electrical diploma holder must be competent to repair and maintain these machines and give
suggestions to improve their performance. Practical aspects of the subject will make the students capable
of performing various tests on the machines as per latest BIS specifications
DETAILED CONTENTS
Unit-1
DC Generators: Main constructional features of DC machines, working principle, Types of armature
winding, Function of the commutator for generation action , Factors determining induced emf ,Types of
dc generation on the basis of excitation, voltage built up in a dc shunt generator, Armature Reaction ,
Commutation methods to improve commutation .
Unit-2
DC Motors: Performance and characteristics of different types of DC motors Function of the commutator
for motoring action, Significance of back emf., the relation between back emf and Terminal voltage,
Speed control of dc shunt/series motors , Need of starter, three point dc shunt motor starter and 2 point
starter, Applications of DC motors, Losses in a DC machine, Determination of losses by Swinburne’s test
Unit-3
Single Phase Transformers: Introduction , Constructional features of a transformer and parts of
transformer , Working principle of a transformer, EMF equation, Transformer on no-load and its phasor
diagram ,Transformer – neglecting voltage drop in the windings – Ampere turn balance – its phasor
diagram ,Mutual and leakage fluxes, leakage reactances, Transformer on load, voltage drops and its
phasor diagram , Equivalent circuit, Relation between induced emf and terminal voltage, regulation of a
transformer- mathematical relation, Losses in a transformer
Unit-4
Transformers Tests: Open circuit and short circuit test. Calculation of efficiency, condition for
maximum efficiency-maintenance of Transformer, scheduled Maintenance, Auto-transformer
construction, saving of copper, working and applications, Different types of transformers including dry
type transformer.
Unit -5
3-Phase Transformers: Construction of three phase transformers and accessories of transformers such as
Conservator, breather, Buchholz Relay, Tap Changer (off load and on load) (Brief idea), Types of three
phase transformer i.e. delta-delta, delta-star, star Delta and star-star,
Conditions for parallel operation (only conditions are to be studied), On load tap changer, Difference
between power and distribution transformer, Cooling of transformer
Page 2
DEE401P ELECTRICAL MACHINES – I LAB L0:T0:P2
LIST OF PRACTICALS
1. Measurement of the angular displacement of the rotor of a slip-ring induction motor on applicati;on of
DC to stator of motor winding in sequence and simultaneously to each phase of rotor winding
2. Speed control of dc shunt motor (i) Armature control method (ii) Field control method
3. Study of dc series motor with starter (to operate the motor on no load for a moment)
4. Study of 3 point starter for starting D.C. shunt motor.
5. To perform open circuit and short circuit test for determining: (i) equivalent circuit (ii) the regulation
and (iii) efficiency of a transformer from the data obtained from open circuit and short circuit test at full
load
6. To find the efficiency and regulation of single phase transformer by actually loading it.
7. Checking the polarity of the windings of a three phase transformer and connecting the windings in
various configurations
8. Finding the voltage and current relationships of primary and secondary of a three phase transformer
under balanced load in various configurations conditions such as
(a) Star-star
(b) Star delta
(c) Delta star
INSTRUCTIONAL STRATEGY
Electrical machines being a core subject of electrical diploma curriculum, where a student will deal with
various types of electrical machines which are employed in industry, power stations, domestic and
commercial appliances etc. After studying this subject, an electrical diploma holder must be competent to
repair and maintain these machines and give suggestions to improve their performance. Special care has
to be taken on conceptual understanding of concepts and principles in the subject. For this purpose
exposure to industry, work places, and utilization of various types of electrical machine for different
applications may be emphasized. Explanation of practical aspects of the subject will make the students
capable of performing various tests on the machines as per latest BIS specifications.
RECOMMENDED BOOKS
1. Electrical Machines by SK Bhattacharya, Tata Mc Graw Hill, Education Pvt Ltd. New Delhi
2. Electrical Machines by SK Sahdev, Uneek Publications, Jalandhar
3. Electrical Machines by Nagrath and Kothari, Tata Mc Graw Hill, New Delhi
4. Electrical Machines by JB Gupta, SK Kataria and Sons, New Delhi
5. Electrical Machines by Fitzgerald
6. Electrical Machines by Smarajit Ghosh-Pearson Publishers, Delhi.
Page 3
DEE402 CONTROL SYSTEM L3:T0:P0
RATIONALE
In the present industrial scenario, it is desired that diploma engineers be able to identify, classify,
troubleshoot and maintain the difkferent Control Systems. They are required to implement the planned
plant Control Systems. Therefore, this course has been designed so that students may learn to build, test
and wire the different types of Control Systems for Process Application
DETAILED CONTENTS
Unit-1
Basics of Control System: Introduction, Definitions. Classification of Control Systems with examples.
Open loop systems: Sprinkler used to water a lawn, Stepper motor positioning and
Automatic toaster systems.
Closed loop systems: Human being, Home heating Systems, Voltage Stabilizer.
Comparison of open loop and closed loop control systems.
Unit-2
Transfer function and impulse response: Definition, Advantages and disadvantages of transfer
function, Procedures to determine the transfer function of a control system, Impulse Response, Poles and
zeros of transfer Function, Characteristics equation of transfer function
Unit-3
Block Diagram Representation: Introduction to Block Diagram representation, Advantages and
disadvantages of Block Diagram, Simple or canonical Form of Closed Loop System, Rules for Block
Diagram Reduction (simple), Procedure to solve block diagram reduction problems
Unit-4
Signal flow graph representation: Introduction of Signal Flow Graph, Properties of Signal Flow Graph,
Terminology used in Signal Flow Graph, Methods to obtain Signal Flow Graph from system equations &
Block Diagram, Masons Gain Formula, Comparison of Block Diagram and Signal Flow Graph
Unit-5
Time response analysis of control system and stability: Definition of type and Order of System
Standard test inputs, Steady State Analysis, Steady-state errors and error constants, Derivation of Steady
State Error, Time Response of first order system to step input, Time Response of second order system to
step input, Time Response specifications of the second order system,.
Concept of Stability, Routh-Hurwitz Criteria for Stability.
Page 4
DEE402P CONTROL SYSTEM LAB L0:T0:P2
LIST OF PRACTICALS
1 Identify various blocks of a given open loop system.
2 Identify various blocks of a given closed loop system
3 Convert an open loop system in to a closed loop and observe the difference in output using
control simulator.
4 To study the torque-speed characteristics of an AC servo motor, Determine its parameters and
evaluate its transfer function.
5 To study the open loop and closed loop step response of first and second order simulated linear
systems.
INSTRUCTIONAL STRATEGY
Visit to Industries.
Use Free Simulators Software for teaching / learning activities.
Show Video/Animation Films relevant to Automation & Control System.
RECOMMENDED BOOKS
1. Control System Engg by I.J.Nagrath and M.Gopal , TMH
2. Control Systems: Principles and Design by M.Gopal, TMH
3. Control System Engg by Ogata, PHI
4. Automatic Control System by BC Kuo, Prentice Ha
5. Linear Control System by B.S.Manke, Khanna publication
6. Feed back Control Systems by Dr. S D. Bhide & Barapte, Tech max Publication.
7. Control Systems Engineering by S.K. Bhattcharya, Pearson Education.
8. Automatic Control system by Syed Hasan Saeed , S.K. Kataria &Sons.
Page 5
DEE403 DIGITAL ELECTRONICS L3:T0:P0
RATIONALE
The purpose of the introduction of electronics in the electrical engineering diploma course has been
already explained in the rationale of the subject Analog Electronics. In this course topic like Number
System, Logic Gates,Combinational &Sequential Circuits, Power Supplies & Wave Shape Circuits have
been dealt with.
DETAILED CONTENT
Unit-1
Number Systems & Gates: Decimal, binary, octal, hexa-decimal BCD and ASCII code number systems
and their inter-conversion, Binary and Hexadecimal addition, subtraction and multiplication, 1’s and 2’s
complement methods of addition/subtraction Definition, symbol and truth tables for inverter, OR, AND,
NAND, NOR and X-OR exclusive-AND gates
Unit-2
Boolean Algebra & Combinational Circuits : Boolean Relations and their applications ,DeMorgan’s
Theorems, K-Map up to four variables, Half adder, Full adder, Subtractor ( half and full).
Encoder, Decoder, Multiplexer/Demultiplexer, Display Devices (LED, LCD and 7-segment display) Unit-3 Flip-Flops, Introduction of Shift Registers and Counters: J-K Flip-Flop, R-S Flip-Flop, D-Type Flip-
Flop, T-Type Flip-Flop, Applications of Flip-Flop.
Unit-4
A/D and D/A Converters: A/D converter (Counter ramp, successive approximation method of A/D