Electrical Machines syllabus topics
The following topic groups come from the syllabus content included in this study hub. Consult the official GATE 2027 website for examination updates.
- Single phase transformer: equivalent circuit, phasor diagram, open circuit and short circuit tests, regulation and efficiency;
- Three-phase transformers: connections, vector groups, parallel operation;
- Auto-transformer,
- Electromechanical energy conversion principles;
- DC machines: separately excited, series and shunt, motoring and generating mode of operation and their characteristics, speed control of dc motors;
- Three-phase induction machines: principle of operation, types, performance, torque-speed characteristics, no-load and blocked-rotor tests, equivalent circuit, starting and speed control;
- Operating principle of single-phase induction motors;
- Synchronous machines: cylindrical and salient pole machines, performance and characteristics, regulation and parallel operation of generators, starting of synchronous motors;
- Types of losses and efficiency calculations of electric machines.
How to prepare this subject
- Check topic coverage. Work through the groups above and mark unfamiliar concepts.
- Learn and practise. Study one relevant reference book, then solve worked examples without looking at the solutions.
- Apply concepts. Use GATE EE previous-year questions to assess where you need additional practice.
- Revise and test. Create a short formula or concept sheet and reattempt questions you initially missed.
Recommended reference books
These are textbook suggestions for studying this subject, not a mandatory purchase list.
- Electrical Machinery — P. S. Bimbhra
- Electrical Machines — I. J. Nagrath & D. P. Kothari
Free resources for practice
Use the downloadable question-paper collection and year-wise weightage report as supporting study materials.