Electrical Machines

Transformers

ALl Lecture of Transformer Click here

Lectures:

L-1.1 Basic Operation of Transformer & EMF Equation.
L-1.2 Operation of Transformer on no load and load.
L-1.3 Eddy Current and Hysteresis Losses.
L-1.4 Numericals Based on Eddy current and Hysteresis Losses.
L-1.5 Equivalent Circuit of Transformer..
L-1.6 Phasor Diagram at Lagging Power Factor.
L-1.7 Phasor Diagram at Leading Power Factor
L-1.8 Numericals based on Equivalent Circuits.
L-1.9 Open circuit test of transformer.
L-1.10 Short Circuit test of transformer.
L-1.11 Numerical based on open circuit & short circuit test.
L-1.12 Transformer Efficiency.
L-1.13 Numerical based on Transformer Efficiency.
L-1.14 Voltage Regulation of a Transformer at Lagging Power Factor.
L-1.15 Voltage Regulation of a Transformer at Leading Power Factor.
L-1.16 Numericals based on Voltage Regulation.
L-1.17 Distribution and Power Transformers
L-1.18 Types of Transformer
L-1.19 Performance of Transformer at different Frequencies.
L-1.20 Concept of Interturn Capacitance or Self distributed capacitance
L-1.21 Concept of Magnetizing Inrush Current
L-1.22 Parallel operation of Single phase transformer
L-1.23 Autotransformer Part-1
L-1.24 Autotransformer Part-2
L-1.25 Autotransformer Problems

QUIZZES and ASSIGNMENTS with Solutions

Quiz-1 (Equivalent Circuit , Basic Operation of operation )
Quiz-2 (Eddy Current and Hysteresis loss , open circuit and Short Circuit)
Quiz-3 Efficiency of transformer
Quiz-4 Voltage Regulation of transformer
Quiz-5 Auto Tranformer
Quiz-6 Full Transformer GATE Level-1
Quiz-7 Full transformer GATE Level-2

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Three Phase Transformers

All Lectures of  Three Transformers Click here

Lectures:

L-2.1 Introduction to Three phase transformer
L-2.2 Concept of Star-Star and Delta-Delta
L-2.3 Concept of Star-Delta and Delta-Star
L-2.4 Numericals based on Three phase
L-2.5 Introduction to vector group and Clock cycle(Including Phasor diagrams)
L-2.6 Problems based on Vector group
L-2.7 Concept of open delta connection
L-2.8 Scott Connection

QUIZZES and ASSIGNMENTS with Solutions

Quiz-1 Three phase connections (Star-star ,Star-delta,Delta-delta,Delta-star)
Quiz-2 Vector group and clock cycle
Quiz-3 Open delta and Miscellaneous questions on three phase transformer

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Three Phase Induction Machine

All lectures of Three phase Induction motor Click Here

Lectures:

L-3.1 Operation of Induction motor
L-3.2 Construction of Induction motor and concept of Slip
L-3.3 How rotating magnetic field is produce.
L-3.4 Concept of Slip and Rotor frequency
L-3.5 Solved problems on rotating magnetic Field [**Imp**]
L-3.7 Effect on slip in parameters of Induction motor
L-3.8 Equivalent Circuit of Induction motor
L-3.9 Comparison between transformer and Induction motor
L-3.11 Power flow in Induction motor
L-3.12 Solved Problems on Power Flow
L-3.14 IES Conventional Problems on Power Flow
L-3.15 Torque Slip Characteristics
L-3.16 Derivation of Maximum Troque and maximum Slip
L-3.17 Stable and Unstable region in Torque slip Curve
L-3.18 Ratio of Maximum, starting and full load torque
L-3.19 Practice Problems on Torque slip curves and ratios.
L-3.21 Gate Problems on stability (*** Important***)
L-3.32 IES conventional Problems on Torque Slip Curve (2000-2017)
L-3.33 No load test on Induction motor
L-3.34 Blocked rotor test on Induction motor
L-3.35 GATE Problems on No-load and blocked rotor test
L-3.36 Starting of Induction motor (i) rotor Resistance Starting
L-3.37 (ii) Auto Transformer Starting
L-3.38 (iii) Star-Delta starting
L-3.39 Practice problem on Starting
L-3.42 Speed Control of Induction motor
L-3.43 Rotor Resistance Control based speed control
L-3.44 Stator Voltage Control based Speed control of Induction motor
L-3.45 (V/f) Control based speed control of Indcution motor
L-3.46 Practice problems on speed control of Induction motor
L-4.49 Concept of Open Slot and semi slot in Rotor Construction
L-4.50 Cogging and Crawling Phenomenon in Induction motor
L-4.51 Introduction Skin effect in Induction motor
L-4.52 Significance of Skin Effect in rotor construction and starting of I.M [**Imp**]
L-4.53 Deep bar rotor and Double Cage rotor
L-4.54 Miscellaneous Concepts in Induction motor.
L-4.55 Miscellaneous Practice Problems in Induction motor.

Quizzes and Assigment with Solutions

Quiz-1 (Rotor Frequency and rotating Magnetic Field)
Quiz-2 ( Stability , maximum torque and Starting torque)
Quiz-3 (Power flow and Starting of Induction motor)
Quiz-4 (Speed control and conceptual )
Quiz-5 ( Miscellaneous questions on Induction motor)
Quiz-6 (Full Induction motor GATE Level-1)
Quiz-7 ( Full induction motor GATE Level -2)

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Single Phase Induction motor

For all lectures of Single phase Induction motor Click Here

Lectures:

L-4.1 Introduction to Single Phase Induction motor
L-4.2 Why Single Induction motor is not Self Starting
L-4.3 Equivalent circuit corresponding to Single Phase Induction motor
L-4.4 How to make Single Phase Induction motor Self starting
L-4.5 Capacitor Start induction motor
L-4.6 Capacitor start capacitor run Induction motor
L-4.7 Practice problems on Single Phase Induction motor
L-4.9 IES Conventional Problems (2000-2017)
L-4.10 Concept of single phasing in three phase induction motor?

Quizzes and Assignments

Quiz-1

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DC Machines

For all lectures of DC Machine Click Here

Lectures:

L-5.1 Working of AC generator?
L-5.2 Working of DC generator?
L-5.3 Armature Winding : Lap Winding Connection?
L-5.4 Armature Winding: Wave Winding Connection?
L-5.5 Commutation Phenomenon in DC machine?
L-5.6 Commutation Failure and effects?
L-5.7 Methods to improve Commutation Phenomenon?
L-5.8 Difference between DC generator and DC motor?
L-5.9 MMF diagram in DC machine?
L-5.10 Armature reaction in DC machine?
L-5.11 Effects of Armature reaction?
L-5.12 Methods to Improve armature reaction?
L-5.13 EMF equation of DC generator?
L-5.14 Practice Problems on DC generator?
L-5.16 Types of DC generator
L-5.17 Self Excited DC generator and OCC curve
L-5.18 External , internal and no load curve of DC generator
L-5.19 Voltage build up process in DC generator
L-5.20 Characteristics of DC Series generator
L-5.21 characteristics of DC Compound generator
L-5.22 Conceptual (tricky) question on DC generator
L-5.24 Operation of DC Motor
L-5.25 Significance of Back EMF
L-5.26 Power Flow in DC machines
L-5.27 Solved Problems in Power Flow in DC Machine
L-5.28 Characteristics of DC shunt Motor
L-5.29 Characteristics of DC Series Motor
L-5.30 Characteristics of DC compound Motor
L-5.31 Special application of Differential DC Compound motor
L-5.32 Conceptual Questions on DC motor
L-5.33 Solved Problems on DC motor (Part-1)
L-5.34 Solved Problems on DC motor(Part-2)
L-5.35 Starting of DC motor (3 Point Starter)
L-5.36 Solved Problem on 3 Point starter
L-5.37 Speed Control of DC motor
L-5.38 Ward Leonard method of speed Control
L-5.39 Solved Problems on Speed Control of DC Motor (Part-1)
L-5.40 Solved Problems on Speed Control of DC Motor (Part-2)
L-5.42 Braking of DC motor : Plugging , Dynamic and Regenerative Braking
L-5.43 Solved Problems on braking of DC motor
L-5.45 Efficiency of DC motor
L-5.46 Solved Problems on Efficiency of DC motor
L-5.47 Miscellaneous Problems on DC Machine

Quizes and Assignments with Solution

Quiz-1 (Armature Reaction ,commutation ,EMF equation,Generator Characteristics)
Quiz-2 ( Power flow in DC Motor and generator)
Quiz-3 (Characteristics of DC motor)
Quiz-4 ( Speed Control of DC motor )
Quiz-5 (Braking of DC motor and efficiency)
Quiz-6 ( Full DC Machine)

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Synchronous Machine

For all Lectures of Synchronous Machine Click here

Lectures:

L-6.1 Basic concept of Synchronous Generator
L-6.2 Construction of Synchronous Machine - Cylindrical rotor and Salient Pole rotor
L-6.3 Why armature winding is placed on stator and field winding placed on rotor ?
L-6.4 Operation of Synchronous generator at No-Load
L-6.5 Armature reaction of Synchronous Generator : (i) Unity Power factor load
L-6.6 Armature reaction of Synchronous Generator : (ii) ZPF lag (iii) ZPF Lead load
L-6.7 Armature reaction of Synchronous Generator : (iv) P.F Lag (v) P.F Lead operation
L-6.8 Difference between Synchronous Generator and Synchronous Motor
L-6.9 Armature reaction of Synchronous Motor : (i)Unity Power factor load
L-6.10 Armature reaction of Synchronous Motor : (ii) ZPF lag (iii) ZPF Lead load
L-6.11 Armature reaction of Synchronous Motor : (iv) P.F Lag (v) P.F Lead operation
L-6.12 O.C.C and Magnetization Characteristics of Synchronous Generator
L-6.13 Short Circuit Characteristics of Synchronous Generator
L-6.14 Zero Power factor (ZPFC) Characteristics of Synchronous Generator
L-6.15 Voltage regulation of Synchronous Machine
L-6.16 Solved Problems on Voltage regulation
L-6.17 Starting of 3 phase Synchronous method
L-6.18 Power Flow Equation of Synchronous Generator
L-6.19 Power Flow Equation of Synchronous motor
L-6.20 Solved Problems on Power Flow
L-6.21 Power Factor Control of Synchronous Motor
L-6.22 Synchronous motor operated in Over Excited region
L-6.23 Power Factor Control of Synchronous Generator
L-6.24 Salient pole operation of synchronous machine
L-6.25 Phasor Diagram of salient Pole Machine
L-6.26 Porblems on Salient Pole Machine
L-6.27 Hunting Phenomenon in Synchronous Machine
L-6.28 Operation of Induction Generator

Quizzes and Assigments with Solutions

Quiz-1 ( OCC and SSC test , Power Flow )
Quiz-2 (Power Factor Control of Synchronous Motor)
Quiz-3 ( Power Factor Control of Synchronous Generator)
Quiz-4 (Coceptual Questions)
Quiz-5 (Salient Pole Machine)
Quiz-6 (Full Synchronous Machine ) Gate Level-1
Quiz-7 (Full Synchronous Machine) GATE Level-2