15EE31T: Dc Machines and Alternators Electrical 3rd Sem Syllabus for Diploma DTE Karnataka C15 Scheme

Dc Machines and Alternators detail DTE Kar Diploma syllabus for Electrical And Electronics Engineering (EE), C15 scheme is extracted from DTE Karnataka official website and presented for diploma students. The course code (15EE31T), and for exam duration, Teaching Hr/week, Practical Hr/week, Total Marks, internal marks, theory marks, duration and credits do visit complete sem subjects post given below. The syllabus PDFs can be downloaded from official website.

For all other electrical 3rd sem syllabus for diploma c15 scheme dte karnataka you can visit Electrical 3rd Sem Syllabus for Diploma C15 Scheme DTE Karnataka Subjects. The detail syllabus for dc machines and alternators is as follows.

Pre-requisites:

Elements of Electrical Engineering and Electrical Circuit Theory.

Course Objectives:

To learn working principle, construction, operation and performance of D.C. Generator, D.C Motor, special Motors and Alternators.

Course Outcomes:

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Unit 1 DC GENERATORS CONSTRUCTION AND WORKING 08hrs

Working principle of D.C. Generator –
Principle, Simple loop Generator, Direction of induced E.M.F.

Construction and types of D.C Generators –
Construction -Yoke, Armature, field poles, field coils, Commutator, brushes-Materials used for construction -properties of these materials-Reasons for using these materials -slot insulation materials -properties. Functions of each part in brief. Types of DC generators with circuit representation.

Armature windings-
Types of windings, Rules of lap & wave winding, application of lap & Wave windings.

Induced E.M.F-
E.M.F equation & problems.

Unit 2 PERFORMANCE OF DC GENERATORS 06hrs

Armature reaction-
Explanation of armature reaction with sketches, De-magnetizing & cross -magnetizing effect, Compensating winding.

Commutation-
Definition-Explanation -methods of improving commutation.

Characteristics-
Open circuit, internal, external characteristics of separately excited D.C. Generator: – OCC of shunt Generator -critical resistance- conditions for voltage build up-failure to build up -internal & External characteristics of shunt Generator.

Efficiency & voltage Regulation-
Losses in D.C. Generator, Efficiency, voltage regulation & its importance-simple problems.

Unit 3 DCMOTORS 12hrs

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Unit 4 ALTERNATOR CONSTRUCTION AND WORKING 08hrs

Alternator Principle – Construction – Types.

Armature winding-
Types of armature windings, full pitch and fractional pitch windings and their advantages and dis-advantages.

Emf equation-
Relationship between P,N,f, emf equation, and Problems.

Armature Reaction-
Armature reaction in an alternator with sketches. Effects of load pf’s on armature reaction. Effects of armature reaction on terminal voltage.

Unit 5 ALTERNATOR PERFORMANCE 12hrs

Voltage regulation –
Procedure for conducting O.C & S.C. tests on alternator with circuit arrangements Definition of effective resistance, leakage reactance & synchronous reactance. Calculate the synchronous impedance by O.C. & S.C. test results. Vector diagram of alternator on Load at different power factors. Equation for the no-load terminal voltage at different power factors. Voltage regulation – Definition. and methods to find voltage regulation. Determine regulation of 3-phase alternator byconducting O.C & S.C tests by EMF method.

Parallel operation –
Conditions for parallel operation of single phase & three phase alternators, Parallel operation of three phase alternators using synchronoscope.

Excitation Systems –
Meaning and types of excitation. Static excitation system.

Un-equal voltage –
Effect of un-equal voltage on load sharing. Effect of change in excitation and prime mover input power on distribution of load.

Hunting and its prevention –
Hunting in alternators and its prevention.

Cooling –
Necessity of cooling in alternators. Cooling agents. – Hydrogen cooling

Unit 6 SPECIAL MACHINES 06hrs

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Reference Books:

1. Electrical Technology volume 2 – BL Theraja & A.K.Theraja S.Chand publication
2. Principles of Electrical Machines by V.K.Mehtha.S.Chand publication
3. Electrical Machines by M.N. Bandyopadhyay PHI Learning Pvt. Ltd.
4. Electrical Machines by Bhattacharya. Tata McGraw Hill Co.
5. Electrical Machines – J.B.Guptha Kataria & Sons Publications.
6. Generation of Electrical Energy by BR Gupta. S.Chand Publication.
7. Fundamentals of elecrical drives – G.K. Dubey Narosa publications.
8. Electrical Machines – Deshpande.

E-Resources

1. http://www.schandgroup.com
2. http://phindia.com
3. http://ikbooks.com

Course Delivery:

The Course will be delivered through lectures, classroom interaction, animations, group discussion, exercises and assignments.

Course Contents with Lecture Schedule:

1. Introduction to Generator 01 Hour
2. E.M.F induced in a Simple loop Generator and its direction. 01 Hour
3. Construction of Yoke, Armature, Field poles, Field coils, Commutator, brushes. Properties of materials used in construction. Function of each part. 01 Hour
4. Types of DC Generators and draw their circuit diagrams. 01 Hour
5. Types of Armature windings, Rules of Lap windings and their application. 01 Hour
6. Rules of Wave windings and their application. 01 Hour
7. Derive induced E.M.F of a dc generator 01 Hour
8. Problems on induced E.M.F 01 Hour
9. Armature Reaction, De-magnetizing and Cross-magnetizing effect with sketches. 01 Hour
10. Compensating winding. 01 Hour
11. Commutation 01 Hour
12. Methods of improving Commutation. 01 Hour
13. Separately excited DC generator – Open circuit, internal, external characteristics. 01 Hour
14. Shunt Generator – Open Circuit Characteristics, Critical Resistance, and Conditions for voltage build up, Internal and External Characteristics. 01 Hour
15. Working principle -comparison of motor & Generator action. 01 Hour
16. Back emf & voltage equation & simple problems. 01 Hour
17. Types of motors:shunt, series & compound Motors draw their circuit diagrams with voltage equations. 01 Hour
18. Torque developed by D.C motors. Meaning of Torque & torque equation[no derivation] 01 Hour
19. Problems on Torque and Speed of DC motors. 01 Hour
20. Torque – Speed, Speed – Load and Torque – Load Characteristics of Series, Shunt Motors. 01 Hour
21. Torque – Speed, Speed – Load and Torque – Load Characteristics of Compound Motors and Applications of Motors. 01 Hour
22. Methods of speed control of shunt motor, Explanation of Field control method. 01 Hour
23. Explanation of speed control of DC motor by Armature resistance method. 01 Hour
24. Block diagram of Electronic speed control. 01 Hour
25. Necessity of Starter in DC motor. 01 Hour
26. Construction and operation of 3-point starter. 01 Hour
27. Introduction to alternators. 01 Hour
28. Basic principle of Alternator. 01 Hour
29. Construction of salient pole types of rotors. 01 Hour
30. Construction of non-salient pole types of rotors. 01 Hour
31. Full pitch Armature windings and Fractional pitch Armature windings. 01 Hour
32. Advantages and dis-advantages of Full pitch and Fractional pitch Armature windings. 01 Hour
33. Relationship between P,N,f and Derivation of emf equation. 01 Hour
34. Simple problems on E.M.F equation. 01 Hour

Directorate OfTechnical Education

35. Armature reaction in an alternator with sketches 01 Hour
36. Effects of p.f of load on armature reaction and Effects of armature reaction onterminal voltage. 01 Hour
37. Procedure for conducting O.C & S.C. tests on alternator with circuit arrangements Determine regulation of 3-phase alternator by conducting O.C & S.C tests by EMF method. 01 Hour
38. Definition of effective resistance, leakage reactance & synchronous reactance. Calculate the synchronous impedance by O.C. & S.C test results. 01 Hour
39. Vector diagram of alternator on Load at different power factors. 01 Hour
40. Equation for the no-load terminal voltage at different power factors. Voltage regulation definition and methods. 01 Hour
41. Necessity and Conditions for parallel operation of three phase alternators. 01 Hour
42. Parallel operation of three phase alternators using synchronoscope. 01 Hour
43. Meaning and types of excitation. Static excitation system. 01 Hour
44. Effect of un-equal voltage on load sharing. Effect of change in excitation and prime mover input power on distribution of load. 01 Hour
45. Hunting and its prevention in alternator. 01 Hour
46. Necessity of cooling in alternators. Cooling agents. – Hydrogen cooling. 01 Hour
47. working, construction and applications of Universal Motors 01 Hour
48. working, construction and applications of Reluctance Motor 01 Hour
49. working, construction and applications of Two phase , Four Pole Permanent magnet Stepper Motor 01 Hour
50. working, construction and applications of Servo Motor 01 Hour
51. working, construction and applications of Brushless D.C. Motors 01 Hour
52. DC and AC Tachogenerators- construction, working and applications. 01 Hour

Suggested Student Activities:

Each Student has to prepare and submit at least 3 pages of self hand written report (Construction details, type of windings used, Insulating materials used, cooling methods, applications etc.,) preferably by visiting a nearby Substation/ Power station/ Industry/ Factory etc., considering any one of the following topics.

1. DC Generators & DC Motors
2. Alternators
3. Special Machines
4. Cooling methods in Alternators
5. DC Motor Speed control techniques

Model Question Paper:

(CIE)

1. Define dc generator and mention the important parts of dc generator.
2. Explain de-magnetizing and cross magnetizing effects

OR A DC generator of an 6 pole ,54slots,16 conductors per slot,1000rpm wave wound, useful flux per pole is 6.5mwb.calculate the generated voltage.

3. Draw the Internal Characteristics of separately excited D.C. generator

OR List the causes for the failure of voltage build up in a D.C shunt generator.

4. Draw the O.C.C. of a D.C. shunt generator and determine the critical field resistance.

Directorate OfTechnical Education

Model Question Paper:

PART-A

1. Explain the working principle of a dc generator.
2. Draw the neat sketch of a dc generator and label the parts.
3. What is armature reaction? List its effects.
4. Illustrate the significance of back emf.
5. State the applications of shun t motor.
6. Describe the construction of salient type alternator.
7. Compute the relation between P,N,f.
8. Define effective resistance, leakage reactance & synchronous reactance.
9. State the applications of stepper motor.

PART – B

1. Name the properties of material used in dc generators. 4
2. A DC generator of an 6 pole, 54slots, 16 conductors per slot, 1000rpm wave Wound, useful flux per pole is 6.5mwb.calculate the generated voltage. 6
1. Draw the O.C.C. of a D.C. shunt generator and determine the critical field resistance. 6
2. State the condition for maximum efficiency. 4
1. Classify D.C. motor and write their voltage equations. 4
2. Define torque, Write expressions for shaft Torque, Armature Torque. 6
1. Explain the process of voltage build up of a DC shunt generator. 5
2. List the applications of shunt generator. 5
1. A 3-phase, 16-pole alternator has a star-connected winding with 144 slots and10 conductors per slots. The flux per pole is 0.03 wb, sinusoidally distributed and the speed is 375rpm. Find the frequency rpm and the phase and line emf. Assume full-pitched coil. 6
2. Explain the armature reaction in an alternator with neat sketches. 4
1. Discuss the effects of lagging p.f of load on armature reaction. 6
2. Illustrate the effects of armature reaction on terminal voltage. 4
1. Explain EMF method of finding regulation of alternator. 6
2. State the necessity and conditions for parallel operation of three alternators. 4
1. Explain with neat circuit diagram the static excitation of an alternator. 5
2. Explain the effect of un-equal voltage on load sharing. 5
1. Explain how is Hunting Prevented in alternators? 5
2. Explain the construction and working of a brushless DC motor. 5
1. Explain the construction and working of a universal motor. 5
2. Explain the construction and working of a servo motor. 5

Directorate OfTechnical Education

For detail syllabus of all other subjects of BE Electrical, C15 scheme do visit Electrical 3rd Sem syllabus for C15 scheme.

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