# EE11001: Electrical Technology

EE11001 | |||||||||||||||||||||||||||||
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Course name | Electrical Technology | ||||||||||||||||||||||||||||

Offered by | Electrical Engineering | ||||||||||||||||||||||||||||

Credits | 4 | ||||||||||||||||||||||||||||

L-T-P | 3-1-0 | ||||||||||||||||||||||||||||

Previous Year Grade Distribution | |||||||||||||||||||||||||||||

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Semester | Spring |

## Contents

# Syllabus[edit | edit source]

## Syllabus mentioned in ERP[edit | edit source]

Course Contents Theory Component: Introduction: Sources of energy; General structure of electrical power systems, Power transmission and distribution via overhead lines and underground cables, Steam, Hydel, Gas and Nuclear power generation. DC Networks: Kirchoff’s laws, node voltage and mesh current methods, Delta-star and stardelta conversion, Superposition principle, Thevenin’s and Norton’s theorems. Single phase AC Circuits: Single phase EMF generation, average and effective values of sinusoids, solution of R,L,C series circuits, the j operator, complex representation of impedances, phasor diagram, power factor, power in complex notation, solution of parallel and series – parallel circuits. Three phase AC Circuits: Three phase EMF generation, delta and Y – connections, line and phase quantities, solution of three phase circuits, balanced supply voltage and balanced load, phasor diagram, measurement of power in three phase circuits, Three phase four wire circuits. Magnetic Circuits: Ampere’s circuital law, B – H curve, solution of magnetic circuits, hysteresis and eddy current losses, relays, an application of magnetic force, basic principles of stepper motor. Transformers: Construction, EMF equation, ratings, phasor diagram on no load and full load, equivalent circuit, regulation and efficiency calculations, open and short circuit tests, auto-transformers. Induction Motor: The revolving magnetic field, principle of orientation, ratings, equivalent circuit, Torque-speed characteristics, starters for cage and wound rotor type induction motors. DC Machines: Construction, EMF and Torque equations, Characteristics of DC generators and motors, speed control of DC motors and DC motor starters. Electrical Measuring Instruments: DC PMMC instruments, shunt and multipliers, multimeters, Moving iron ammeters and voltmeters, dynamometer, wattmeter, AC watthour meter, extension of instrument ranges. Laboratory Component: Suggested Experiments 1.To measure the armature and field resistance of a DC machine. 2. To calibrate a test (moving iron) ammeter and a (dynamometer) Wattmeter with

�respect to standard (DC PMMC) ammeter and voltmeters. 3. Verification of circuit theorems – Thevenin’s and superposition theorems (with DC sources only). 4. Measurement of current, voltage and power in R-L-C series circuit exited by single phase) AC supply. 5. Open circuit and short circuit tests on a single phase transformer. 6. Connection and starting of a three phase induction motor using direct on line (DOL) or star – delta starter. 7. Connection and measurement of power consumption of a fluorescent lamp and voltage – current characteristics of incandescent lamps. 8. Determination of open circuit characteristics (OCC) or a DC generator. 11. Two wattmeter method of measuring power in three phase circuit (resistive load only)

## Concepts taught in class[edit | edit source]

As time passes by, the syllabus keeps on decreasing with the increasing number of failures and the need for DepC Ex's and A's. As far as the session of 2017-18 is concerned, the overall syllabus is as follows:

1.DC Circuits(Certain topics like Non linear elements have been removed)

2.AC Circuits

3.3 Phase Circuits (Unbalanced load not in syllabus)

4.Transients (Only 1st order transients in DC and AC circuits)

In most cases the midsem syllabus is upto this portion.

5.Magnetic Circuits (hysteresis and eddy current losses(only qualtitaive), relays, an application of magnetic force, basic principles of stepper motor- these topics are not in syllabus)

6.Single Phase transformers

7.3 Phase Induction Motor(Squirrel cage only)

The entire syllabus comes in the Endsem paper.

From the session of 2017-18, worksheet type question papers were started for this subject, implying limited space for solving a particular question.

In both midsem and endsem papers, there are a total of 6 questions out of which 5 are to be attempted. If someone attempts all 6, then the best 5 will be taken for marking. Each question has several subparts.

https://www.youtube.com/playlist?list=PL9RcWoqXmzaLTYUdnzKhF4bYug3GjGcEc

https://www.youtube.com/playlist?list=PL1XaeVNXKsvzzeCAqstGAG1_io1FhxVyk

https://www.youtube.com/playlist?list=PL1XaeVNXKsvxpQCpOL701qk4gR0DwDc57 (Machines)

https://www.youtube.com/watch?v=-5eh6DsKgSo(Auto trnsformer)

### Student Opinion[edit | edit source]

This is one of the most dreaded subjects in the 1st year curricula. First of all the paper will be completely numerical based, so get ready for hectic calculations(in my endsem paper, my calculator showed 'STACK ERROR' while solving a magnetic circuit ;] ). Nobody can assure you about the quality of professors you can get in your class. So the best thing is to study for yourself. Focus more on numericals rather than only reading theory.

As far as grading is concerned, if the coordinator and the profs teaching the subject are peaceful, then each student gets 3-5 Ex's. In 2016-17 when the cooordinator prof was a loaded one, each section had only one Ex. The subject has relative grading.

In midsems(comparatively easy) marks cross 50 (for those who have practised damn well may get 60) out of 60. However endsem is the biggest bouncer where even the best students get atmost 82 or 84, after which there is a big gap and marks get down from 70s.

Attendance in classes and tutorials plays a very important role in your TA marks.

The tutorials are of 3 hours and are taken in a alternate manner with the lab. Infact EE19001 Lab marks has 40% weightage of your tutorial test marks and attendance. Try to take maximum help from the TAs by asking them to help you with each and every concept. However be careful, sometimes they might tell you a longer method. So verify it from your professor.

The biggest question is 'Where should I practise the numericals from?'. The only answer to this is 'Previous Year Question Papers' and Tutorial Sheets (http://www.ee.iitkgp.ac.in/faci_et.php) on the library website and DC++. There is no book that will ever reach the level of problems given in the paper. However this book might help you a lot : http://www.engineeringbookspdf.com/download/?file=2925. https://docs.google.com/file/d/0B0uVd31B7zGEWjRQNlJlX05vdms/edit this book also helps a lot. Also pay attention to your tutorial classes and those moments of time when your prof starts solving sums. I can recommend the pdf version of Thareja for some good questions, but dont rely on the answers.

Infact for an idea of those complex AC DC circuit problems you can search for IES/ESE Conventional Papers for ECE and EE branches. Surprisingly they are very similar to the questions asked in exams.

Generally class tests are not taken. Be ready for a 30 minute 10 marks test in the beginning of the tutorial class. Do prepare well for it because it is the only thing to save you when your midsem and endsem marks go down.