Electrical Machines-I (Diploma)

DC machines and single-phase and three-phase transformers.

6 MonthsDuration 5Chapters26Topics

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Syllabus · पाठ्यक्रम

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01DC Generators 6 topics

Construction of DC machines
EMF equation
Lap and wave windings
Types of DC generators
Armature reaction and commutation
Characteristics of DC generators

02DC Motors 5 topics

Principle and back emf
Torque equation
Types and characteristics of DC motors
Speed control methods
Three-point and four-point starters

03Losses and Testing of DC Machines 4 topics

Losses in DC machines
Efficiency and condition for maximum efficiency
Swinburne's test
Brake test and Hopkinson's test (introduction)

04Single-Phase Transformers 6 topics

Construction and types
EMF equation and turns ratio
Phasor diagrams on no load and load
Equivalent circuit
OC and SC tests
Voltage regulation and efficiency, all-day efficiency

05Three-Phase Transformers and Autotransformers 5 topics

Three-phase transformer connections
Vector groups (Dyn11)
Parallel operation
Autotransformer and copper saving
Cooling of transformers

About

You will be able to

Explain the construction, EMF equation and characteristics of DC generators
Explain the working, torque, characteristics, speed control and starting of DC motors
Calculate losses and efficiency of DC machines and explain Swinburne's test
Explain the construction, EMF equation, equivalent circuit, regulation and efficiency of single-phase transformers
Explain three-phase transformer connections, parallel operation and autotransformers

Who it is for

Diploma Electrical Engineering students of Semester 3 (BTEUP)
Students preparing for JE (Electrical) and electrician-level exams

What you need

Basic electricity and magnetism (Faraday's laws, magnetic circuits)

Questions

Is the lab separate?

Yes. Machine tests are done in the Electrical Machines-I Lab; this course covers the theory paper.

Are numericals included?

Yes. EMF equation, back emf, speed, efficiency and regulation problems are solved.

Is this course based on the BTEUP syllabus?

Yes. The units follow the BTEUP (Board of Technical Education, Uttar Pradesh) diploma syllabus. If your polytechnic follows a different board or a revised scheme, the centre teaches your own syllabus.