# JNTUA B.TECH R 20 2-3 Syllabus For Dc machines & transformers PDF 2022

### Get Complete Lecture Notes for Dc machines & transformers on Cynohub APP

You will be able to find information about Dc machines & transformers along with its Course Objectives and Course outcomes and also a list of textbook and reference books in this blog.You will get to learn a lot of new stuff and resolve a lot of questions you may have regarding Dc machines & transformers after reading this blog. Dc machines & transformers has 5 units altogether and you will be able to find notes for every unit on the CynoHub app. Dc machines & transformers can be learnt easily as long as you have a well planned study schedule and practice all the previous question papers, which are also available on the CynoHub app.

All of the Topic and subtopics related to Dc machines & transformers are mentioned below in detail. If you are having a hard time understanding Dc machines & transformers or any other Engineering Subject of any semester or year then please watch the video lectures on the official CynoHub app as it has detailed explanations of each and every topic making your engineering experience easy and fun.

### Dc machines & transformers Unit One

#### Magnetic Material Properties and Applications:

ntroduction, Magnetic materials and their properties, magnetically induced emf and force, AC operation of magnetic circuits, hysteresis and eddy current losses, permanent magnets, and applications of permanent magnet materials. Principles of electromechanical energy conversion:Energy in magnetic system, field energy and mechanical force, multiply-excited magnetic field systems, forces/torques in systems with permanent magnets, energy conversion via electric field, dynamical equations of electro mechanical systems

### Dc machines & transformers Unit Two

#### DC Generators

Constructional details of DC machine, principle of operation of DC generator, armature windings and its types, emf equation, armature reaction, effect of brush lead, demagnetizing and cross magnetizing ampere turns, compensating windings, commutation, emf induced in a coil undergoing commutation, methods of improving commutation, OCC and load characteristics of different types of generators. Parallel operation of DC Generators: DC shunt and series generators inparallel, equalizing connections

### Dc machines & transformers Unit Three

#### DC Motors

Force on conductor carrying current, back emf, Torque and power developed by armature, speed control of DC motors (Armature control and Flux control methods), Necessity of starters, constructional details of 3-point and 4-point starters, characteristics of DC motors, Losses in DC machines, condition for maximum efficiency Testing of DC machines: Brake test, Swinburne’s test, Hopkinson’s test, Fields test, Retardation test.

### Dc machines & transformers Unit Four

#### SinglePhase Transformers

Principle, construction and operation of single-phase transformers, equivalent circuit, phasor diagrams (no load and on load), Magnetizing current, effect of nonlinear B-H curve of magnetic core material, harmonics in magnetization current, losses and efficiency Testing -open circuit and short circuit tests, voltage regulation, Sumpner’s test, separation of hysteresis and eddy current losses. Parallel operation of single-phase transformers, Autotransformers -construction, principle, applications and comparison with two winding transformer.

### Dc machines & transformers Unit Five

#### Three Phase Transformers

Three-phase transformer –construction, types of connection and their comparative features, Phase conversion -Scott connection, Tap-changing transformers -No-load and on-load tap changing of transformers, Three-winding transformers-Cooling of transformers. Textbooks:

### Dc machines & transformers Course Objectives

Student will be able to Study magnetic materials, electromechanical energy conversions, principle and operation of DC machines and transformers and starters.
understand the constructional details of DC machines and Transformers
Analyzethe performance characteristics of DC machines and transformer Evaluate efficiency, regulation and load sharing of DC machines and transformers Design Equivalent circuit of transformer

### Dc machines & transformers Course Outcomes

At the end of this course, students will demonstrate the ability to
Understand the concepts of magnetic circuits, principle and operations of DC machines, starters and single and three phase transformers
Analyze armature reaction, parallel operation, speed control and characteristics of DC machines. Alsoanalyze the performance characteristics with the help of OC and SC tests of transformer
Evaluate generated emf, back emf, speed, efficiency and regulations of DC machines and efficiency and regulation of transformer also load sharing of parallel connected transformers
Design winding diagrams of DC machines and equivalent circuit of transformer.

### Dc machines & transformers Text Books

1. P. S. Bimbhra, “Electrical Machinery”, Khanna Publishers, 2011. 2. I. J. Nagrath and D. P. Kothari, “Electric Machines”, McGraw Hill Education,2010.

### Dc machines & transformers Reference Books

1. A. E. Fitzgerald and C. Kingsley, “Electric Machinery”, New York, McGraw Hill Education, 2013.
2. A. E. Clayton and N. N. Hancock, “Performance and design of DC machines”, CBS Publishers, 2004.
3. M. G. Say, “Performance and design of AC machines”, CBS Publishers, 2002.

### Scoring Marks in Dc machines & transformers

Information about JNTUA B.Tech R 20 Dc machines & transformers was provided in detail in this article. To know more about the syllabus of other Engineering Subjects of JNTUH check out the official CynoHub application. Click below to download the CynoHub application.

Recent Courses

₹65,000.00

### Full Stack Development Masterclass

100% Job Guarantee Program Full Stack Development Master Class 100%...
₹15,000.00

₹1,000.00

### Effective English Communication

English is the Most used Language This Course will help...