DC Machines and Transformer
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DC Machines and Transformer Syllabus — Unit-wise Content
The official GTU curriculum for DC Machines and Transformer (subject code 2130904) as prescribed for PE · Semester 3 divides the course into 3 units, covering 48 listed topics. The unit-wise breakdown below is read from the GTU syllabus document for this subject code, so you can check what the course actually covers before deciding which papers to attempt.
Download the official syllabus PDF (2130904)Unit 1 Module 1. Electromechanical Energy Conversion
- Singly Excited Magnetic System and Doubly Excited Magnetic system
- Physical concept of torque production
- Electromagnetic torque and Reluctance torque
- Concept of General terms pertaining to Rotating Machines: Electrical & Mechanical degree
- Pole pitch
- Generated EMF in full pitched coil
- Generated EMF in a short pitched coil
- EMF polygon
- Distribution factor
- Pitch factor
- MMF produced by Distributed Windings
- MMF of a coil
- MMF of single phase distributed Winding
- MMF waveform of Commutator machines
Unit 2 Module 2. D.C. Machines
- Working principle
- construction and methods of excitation
- Armature Winding: Introduction of simplex lap and wave windings
- DC generators: EMF equation – methods of excitation – separately and self-excited – shunt
- compound - armature reaction – effects of armature reaction - demagnetizing & cross magnetizing ampere-turns – compensating windings – inter poles - commutation – methods to improve commutation - voltage build-up – no load characteristics – load characteristics – losses and efficiency - power flow diagram –parallel operation – applications of DC generators
- Motors: Principle of operation – back EMF – classification – torque equation – losses and efficiency – power flow diagram – performance characteristics of shunt
- series and compound motors – starting of DC motors – necessity and types of starters – design of starters – speed control – methods of speed control – solid state speed control (block diagram) – testing – Swinburne’s test – Hopkinson’s test – separation of losses – retardation test – field test of dc motors – application of DC motor
Unit 3 Module 3. Transformers
- construction and operation of single phase transformers
- phasor diagram
- equivalent circuit
- voltage regulation
- losses and efficiency
- Testing- Open & short circuit tests
- Polarity test
- Sumpner’s test
- Separation of hysteresis and eddy current losses
- Autotransformers - Construction
- Applications and Comparison with two winding transformer
- Three phase Transformer: Construction
- various types of connection and their comparative features
- 3-phase transformer connections - ∆-∆
- V-V – vector groupings Yy0, Dd0, Yd1, Yd11, Dy1, Dy11
- Scott connection – three winding transformer – tertiary winding – per unit impedance
- Parallel operation of single phase and three phase transformers
- Excitation phenomenon in transformers
- Harmonics in single phase and three phase transformers
- Tap changing Transformers - No load and on load tap changing of transformers
- Cooling methods of transformers
- Special Transformers: Potential transformer
- Current transformer
- Pulse transformer
- Audio frequency transformer
- Grounding transformer
- Note: 30%-40% weightage should be given to the Examples and Short/Multiple choice questions
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