DI02000171 · Semester 2 · 5G scheme
AC Fundamental
Notes and solutions following the Gujarat Technological University (GTU) syllabus for DI02000171. Independent material — not issued by the university.
Materials
Complete Book
The whole syllabus, unit by unit, written for the exam.
Complete Book
102 pages
Premium Preview · 11 pages
Past Papers
Original question papers from previous exams.
PYQ Solutions
Past university papers, fully solved.
Solved past papers — detailed answers
56 pages · English + ગુજરાતી
Premium Preview · 17 pages
Syllabus units
Unit 1: Fundamentals of Alternating Voltage and Current
- (1) Comparison between AC and DC System
- (2) Principle of generation of alternating voltage
- (3) Sinusoidal Function Terminology: (a) Define terms - wave form, cycle, time period, frequency, amplitude and angular frequency (b) State relations among these terminologies (c) Different forms of sinusoidal quantities
- (4) Various values of sinusoidal alternating quantities: (a) Define terms - instantaneous value, maximum value, average value, RMS value, peak factor, and form factor (2) State relations among these values
- (5) Phase difference between alternating quantities: lagging and leading quantities
- (6) Vector representation of alternating quantity
- (7) Addition of alternating quantities using vector: Graphical and Analytical method
- (8) Transfer of vector from rectangular form to polar form and vice- versa
- (9) Mathematical operation of vectors
- (10) Numerical based on fundamentals of alternating quantities
Unit 2: Single Phase AC Series Circuits
- (1) Behavior of AC through pure resistive, inductive and capacitive circuit: (a) State equations of voltage, current, power and power factor (b) Define term - inductive and capacitive reactance (c) draw wave form and vector diagram of voltage, current and power.
- (2) Behavior of AC through RL, RC, and RLC series circuit: (a) Derive equation of current, power and power factor (b) Draw wave form and vector diagram of voltage and current (c) Draw impedance triangle
- (3) Concepts of power factor: lagging, leading and unity power factor
- (4) Active power, reactive power, apparent power and power triangle
- (5) Resonant condition and resonance frequency in RLC series circuit
- (6) Numerical based on AC series circuits and series resonance
Unit 3: Single Phase AC Parallel Circuits
- (1) Phasor (Vector) method for solving AC parallel circuits.
- (2) Terms related to AC parallel circuits:(a) Define term- admittance, conductance and susceptance (b) Draw admittance triangle
- (3) Admittance method for solving AC parallel circuits.
- (4) Complex algebra method for solving AC parallel circuits.
- (5) Resonance condition and resonant frequency in parallel AC circuits
- (6) Comparison between series and parallel resonance
- (7) Numerical based on AC parallel circuits and parallel resonance
Unit 4: Three Phase System and Circuits
- (1) Comparison between single and three phase systems
- (2) Principle of generation of three phase alternating voltage
- (3) Three phase system terminology: (a) Define term - phase sequence, balanced & un- balanced supply, balanced & un- balanced load (b) state importance of these terminologies
- (4) Values of voltage and current in three phase system: Define terms- line voltage, phase voltage, line current and phase current
- (5) Three phase star connection
- (6) Three phase delta connection
- (7) Numerical based on three phase circuits
About this course
Most of electrical power generation, transmission, distribution, and utilization are in the form of alternating current. Therefore, it is essential for students of diploma electrical engineering to know fundamental concepts of AC and principles of series, parallel and three phase AC circuits to solve electrical circuits. This course is not only a prerequisite to learn the advanced electrical courses but also diploma students undertaking this course are expected to apply the principle of ac circuits to troubleshoot electrical circuits in industries/power system. This is one of the most important core engineering courses for electrical technocrats and hence students should try to develop mastery over fundamental concepts and principles of AC circuits for effective working as an electrical engineer.