# syllabus of electrical machines - 1 in BE/Btech (Electrical Engineering)

## SYLLABUS OF ELECTRICAL MACHINES – I

 Magnetic circuits and Electromechanical energy conversion 1. Magnetic circuits, magneto motive force magnetic field strength, permeability, reluctance, analogy between electric and magnetic-circuits, B-H curve, hysteresis, series and parallel magnetic circuits, practical magnetic circuits, permanent magnet and their applications. 2. Basic principles, conservation of energy, physical phenomenon involved in conversion, energy balance, energy stored in magnetic field. Polyphase Transformer 1. Construction,Various connections and groups, choice of connections, open delta connection, Scott connection, three phase to two phase conversion and vice-versa, Applications, Parallel operation and its conditions 2. Three to six phase conversion.Excitation phenomenon in transformers, magnetizing harmonic currents and their effects,switching currents in transformers, inrush of magnetizing current.Three winding transformer DC Generators 1. Introduction, construction, types, emf equation, lap and wave windings, armature reaction, commutation, methods of improving commutation, equalizer rings. 2. Demagnetizing and cross magnetizing ampere turns, various characteristics of shunt, series and compound generators, voltage build up, losses and efficiency, condition for maximum efficiency. DC Motors 1.Introduction, principals, back-emf, torque of motor, types, characteristics of shunt, series and compound motors, speed control (field and armature control methods), basic idea of solid state devices in controlling of DC motors 2. Starting of DC motors, three point and four point starters, losses and efficiency, testing (brake test and swimburnes test), electric braking of DC motors, Applications. Transformer 1. Construction, Principal, Types, emf equation, no load and short circuit test, equivalent circuits, back-to-back (Sumpner’s test), phasor diagram, Voltage regulation 2.  Efficiency, Condition for maximum efficiency, all day efficiency, parallel operation , auto-transformer, basic idea of welding transformer, current and potential transformer,separation of losses.

### Colleges Offering Same Syllabus :

1. INSTITUTE OF ENGINEERING AND TECHNOLOGY - [IET], ALWAR
2. LOVELY PROFESSIONAL UNIVERSITY - [LPU], JALANDHAR
3. CHANDIGARH UNIVERSITY - [CU], CHANDIGARH
4. MANIPAL UNIVERSITY - [MU], MANIPAL
5. SIKKIM MANIPAL UNIVERSITY - [SMU], EAST SIKKIM

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Ans: bcd view more..
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Ans: Energy exists in many form like mechanical energy, electrical energy, magnetic energy etc. The process of conversion of one form of energy into another form is called conversion of energy. Conversion of another form of energies to electrical energy is used now-a-days to produce electricity. view more..
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Ans: Transformer is a static device which transfer electrical energy from one electrical circuit to another through the medium of magnetic field. The electrical circuit to which supply is given is called primary winding and the other electrical circuit which gives electrical energy to the load is called secondary winding. view more..
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Ans: When we require large scale generation of electrical power, 3-phase transformers are generally used. For higher voltages like 110V, 132V, 400V, 75kV, 3-phase transformers are used to step-up the generated voltage to that of transmission line. When we combine 3 single phase transformers with their cores united into a single core assembly, view more..
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Ans: A machine which changes mechanical energy to electrical energy is called Generator. A D.C. generator has a coil winding for poles on the stationary part which gives a field stationary in space in the air-gap due to D.C. supply in the field winding around the pole. The rotor has commutator type winding with stationary brushes for connection to external circuit. view more..
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Ans: An electrical motor which converts electrical energy into mechanical energy is called motor. A motor which works on DC supply is called DC motor. It is a dc machine characterised by their versatility. view more..

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