DC Machines and Transformer
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Follow on Instagram for UpdatesDC Machines and Transformer Syllabus — Unit-wise Content
The official GTU curriculum for DC Machines and Transformer (subject code DI03024021) as prescribed for AI & DS · Semester 3 divides the course into 5 units, covering 67 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 (DI03024021)Unit 1 DC Generator
- Conservation of Energy
- Energy stored in Magnetic Field
- Forces and torque in magnetic systems
- Singly Excited System
- Basic principle of DC Generator
- Fleming’s right-hand rule
- Various parts of DC generator: yoke
- pole core and pole shoes
- armature winding
- lap and wave winding
- Separately excited
- self-excited-particularly shunt
- series and compound wound type generator
- E.M.F. equation of generator and various losses in generator
- internal and external characteristics
- Applications of DC generator
Unit 2 DC Motor
- Basic principle of DC motor: Fleming’s left-hand rule
- Back EMF and voltage equation
- condition for maximum power
- torque relation
- shaft torque
- relation between torque and speed of motor
- losses and efficiency
- Different characteristics of DC series shunt and compound motor
- Need of starter in DC motor
- four-point starter
- Speed control method: armature
- General applications of shunt
- series, and compound motor
Unit 3 1-Phase Transformer
- Basic principle: Mutual inductance
- EMF equation
- voltage and turns ratio
- Classification and Constructions of transformer
- Properties of ideal transformer
- Equivalent circuit of ideal transformer
- Properties of Practical transformer
- transformer with winding resistance and leakage reactance
- Equivalent circuit of practical transformer
- Transformer test: Open-circuit (No load test)
- Short circuit test
- Polarity test
- load (back-to-back) test
- Transformer losses: Iron (core) loss (hysteresis and eddy current loss)
- Copper (I2R) loss
- stray loss and dielectric loss
- Variac: working principle
- advantages and application
- Transformer name plate reading
- Program Name: Engineering Level: Diploma Branch: Power Electronics Course / Subject Code: DI03024021 Course / Subject Name: DC Machines and Transformer
Unit 4 3-Phase transformer
- Labeling of transformer terminals. 3-Phase transformer connections: Star-Star: 0º and 180° connections
- Problems and solutions. Delta-Delta: 0º and 180° connections
- Advantages and disadvantages. Star-Delta: ±30°connections
- application and advantages Delta-Star: ±30°connections
- application and advantages Choice of connections: star/star
- Input-output voltage and current relations for these connections
- Load test on 3-phase transformer
Unit 5 Maintenance and troubleshooting of DC machine and
- DC Machine: Armature problems: troubles and remedies of commutators and brush gear
- Factors affecting the life of commutator brush and slip ring
- Locate short circuit
- earth fault and open circuit in shunt field coil
- Locate open circuit in armature coils
- Troubles with DC motor
- their cause and remedies
- Transformer: cause of transformer failures Fault with developed gases: arcing
- Buchoz relay: features
- working principle
- Causes of noise in transformer
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