Your roadmap · आपका रोडमैप
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Admission & first meetingप्रवेश और पहली मुलाकातEnquire at your nearest NDSS centre, meet the teacher, fix the batch time and get your study material.
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Part 1 of the syllabusपाठ्यक्रम भाग 1Unit-wise coaching with notes and doubt classes.
Unit 1: Principles of Electromechanical Energy ConversionUnit 2: Single-Phase TransformerUnit 3: Three-Phase Transformers
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Part 2 of the syllabusपाठ्यक्रम भाग 2Unit-wise coaching with notes and doubt classes.
Unit 4: DC Machines and DC GeneratorsUnit 5: DC Motors
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Unit tests & assignmentsयूनिट टेस्टRegular tests in the university / board pattern.
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Semester 4 exam (university / board)विश्वविद्यालय / बोर्ड परीक्षाPrevious papers and full revision before the exam.
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Online tests & resultऑनलाइन टेस्ट और रिज़ल्टTake the tests online; your marks and result show in your student login and at the centre.
Syllabus · पाठ्यक्रम
1 subject · 5 chapters · 40 topics
01Unit 1: Principles of Electromechanical Energy Conversion
6 topics+
- Magnetic circuits and flux linkage
- Energy stored in a magnetic field
- Field energy and co-energy
- Force in singly excited systems
- Torque in singly and doubly excited rotating systems
- Reluctance torque
02Unit 2: Single-Phase Transformer
10 topics+
- Construction and types
- EMF equation and turns ratio
- Phasor diagrams on no load and on load
- Equivalent circuit referred to primary and secondary
- Losses, efficiency and condition for maximum efficiency
- All-day efficiency
- Open-circuit and short-circuit tests
- Voltage regulation
- Sumpner's (back-to-back) test
- Auto-transformer
03Unit 3: Three-Phase Transformers
8 topics+
- Three-phase transformer construction
- Star and delta connections
- Vector groups (Yy0, Dd0, Dy1, Dy11)
- Parallel operation and load sharing
- Open-delta (V-V) connection
- Scott connection (three-phase to two-phase)
- Three-winding transformer and tertiary winding
- Tap changers
04Unit 4: DC Machines and DC Generators
8 topics+
- Construction of DC machines
- Lap and wave armature windings
- EMF equation
- Armature reaction
- Commutation, interpoles and compensating winding
- Types of DC generators
- Open-circuit (magnetisation) and load characteristics
- Voltage build-up and critical resistance
05Unit 5: DC Motors
8 topics+
- Back EMF and torque equation
- Characteristics of shunt, series and compound motors
- Starting and three-point / four-point starters
- Speed control: armature, field and Ward-Leonard
- Losses and efficiency
- Swinburne's test
- Hopkinson's test
- Electric braking
About this course
You will be able to
- Explain electromechanical energy conversion using field energy and co-energy and find force and torque
- Draw the equivalent circuit and phasor diagrams of a single-phase transformer
- Calculate losses, efficiency and voltage regulation from OC and SC test data
- Explain three-phase transformer connections, vector groups and parallel operation
- Derive the EMF and torque equations of DC machines and explain armature reaction and commutation
- Select starting and speed-control methods for DC motors and estimate efficiency by Swinburne's and Hopkinson's tests
Who it is for
- B.Tech Electrical Engineering students of Semester 4 under AKTU
- Students preparing for AKTU sessional tests, the end-semester examination and GATE basics of machines
What you need
- Basic Electrical Engineering and Electromagnetic Field Theory of the first three semesters
Online tests & result
Practice and unit tests online; marks and result show in your student login and at the centre.
Student login →
Questions
Which syllabus is followed?
The current AKTU (Dr. A.P.J. Abdul Kalam Technical University, Lucknow) B.Tech syllabus of Electrical Machines-I (Electrical Engineering, Semester 4). If your university or college follows a different syllabus, the centre teaches from your own university syllabus.
How is the subject examined?
AKTU assesses it through sessional tests, assignments and attendance, and an end-semester university examination; the centre covers every unit with theory, derivations and numericals.
Are previous-year questions practised?
Yes. Unit-wise AKTU previous-year questions, short-answer questions and the test series are solved in class.
